Instruction/ maintenance manual of the product 21555 Intel
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21555 Non-T ransp arent PCI-to- PCI Bridge User Manual July 2001 Order Nu mber: 278 321–00 2.
2 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Informati on in this doc ument is provide d in con nection with Intel ® p roducts. No license, e xpress or implie d, by es toppel o r othe rwise, to any inte llectual property rights is granted b y this document .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 3 Contents Contents 1 Preface ........... ............. ............. .................... ............. ............ ............. .................... ............. .......... 11 1.1 Cautions and Notes .
4 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Contents 5.2 Posted Writ e Transac ti ons ....... ...... ............. ....... ...... ............. ...... ....... ............. ...... ....... ....... 5 0 5.2.1 Memory W rite Tran saction s ..
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 5 Contents 9.2 SROMSROM Preload Operation ....... ................... ............. ............. ............. ................... .... 9 1 9.3 SROM Con figuration Da ta Prelo ad Form at .... ..
6 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Contents 16.7 Interrupt R egister s ............ ............. .................... ............ ............. ............. ............. ........ .... 170 16.8 Scratchp ad Regist ers ........
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 7 Contents 7 Primar y PCI Bus In terface 6 4-Bit Exte nsion S ignals .......... .................... ............. ............. .......... 2 6 8 Secon dary PCI Bus Interfa ce Signa ls ..........
8 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Contents 57 Primary Interface Con figur ation Spa ce Addr ess Map ..... ............. ............. ................... ............ 148 58 Seconda ry Interfac e Configur ation Sp ace A ddress Map .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 9 Contents 107 Primary E xpansion ROM BAR ............ .................... ............ ............. ............. .................... ........ 1 75 108 Primary E xpansion ROM Setup Register .
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 11 Preface 1 A brief desc ription of the conten ts of this man ual follows. Chapter 1, “ Pr efac e ” Provides information about the contents and organization of this book. Chapter 2, “ Introduction ” Provides an overview of the 21555 functionality and architecture.
12 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Preface 1.1 Cautions and Notes Caution: C autions provide in for mat ion to prevent damage to equipment or loss of d a ta. Note: Notes emphasize p articularly important informati on. 1.2 Dat a Unit s This manual uses the followin g da ta- unit ter m inology .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 13 Prefac e 1.4 Signal Nomenclatu re 21555 device si gnal n ames are p rinted in lowercas e typ e. Prefixes and suf fixes are tagged with a leading or trailing letter and are delimited with an “ _ ” underscore: • The prefix “ p_ ” d enotes a primary bus s ignal.
14 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Preface 1.5 Register Abbreviatio ns When a register is associated with the primary interface, its name is preceded with Primary . When a register is associated with the secondar y interface, its name is pr eceded with Secondary .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 15 Introduction 2 The Intel ® 21555 is a PCI periph eral dev i ce that perf orm s PCI bri dg ing f unctions f or em bedd ed and i ntel lig ent I/O applications. The 21555 has a 64-bit primary interface, a 64-bit seco ndary interface, and 66-MHz capability .
16 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Introduction A primary goal of the PPB architecture is that PPB are tran sparent to devices and device drivers. For ex ample, no changes are needed to a device driver when a PCI peripher al is located behind a PPB.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 17 Introduction Ta b l e 3 shows compares a 215 55 and to a transparent PPB. T abl e 3. 21555 an d PPB Fea ture Comparison Feature Non-T ranspa r ent P PB or 21555 T ransparent PPB Transaction forwarding • Adheres to P PB ordering rules.
18 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Introduction 2.2 Architectural Overview This secti on descri bes the buf fers, reg isters, and co ntrol lo gic of the 2155 5: 2.2.1 Da t a Bu ffers Data buf fers include the buf fers along with the associated data path control logic.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 19 Introduction Figur e 2 shows the 21555 mi croarchitectur e. Figur e 2. 21 555 Mic roarchi tecture A7418-01 Primary Config Registers Device- S.
20 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Introduction 2.3 Special Applications 2.3.1 Primary Bu s VGA Suppo rt The 21555 provides hardware sup port that allows configuration o f itself as a V ideo Graphics Adapter (VGA) device.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 21 Introduction • Setting a translated bas e addr ess f o r a downstream range to fall within an address r ange defined for upstream forwarding. This would cause the 215 55 to respond as a target o n the secondary bus to a downstream transaction that it has initiated as a master .
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 23 Signal Descriptions 3 This chapter presents the theory of o peration information about the PCI signal interface. See Chap ter 16 for specific informati on about PCI regist ers. Ta b l e 5 des c ribe s the PC I sig nal grou p s, f unct i o n, a n d pr ovid es a pa g e ref ere nce.
24 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Signal Descriptions 3.1 Primary PCI Bus Interface Sig nals Ta b l e 6 describes the primary PCI bus interface si gnals. The letters in the “ Ty p e ” column are described in Ta b l e 1 . T able 6 .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 25 Signal Descriptions p_p ar TS Primary PCI interface parity . Signal p_p ar carries the even parity of the 36 bits of p_ad[31:0] and p_cbe_l[3:0] for both address and data phases.
26 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Signal Descriptions 3.2 Primary PCI Bus Interface 64 - Bit Extens ion Sig nals Ta b l e 7 describes the primary PCI bus interface 64 -bit extension signals. Th e letters in the “ Ty p e ” column are desc ribe d in Ta b l e 1 .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 27 Signal Descriptions p_p ar64 TS Primary PCI interface upper 32 bits parity . The 21555 does not bus p ark this pin.
28 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Signal Descriptions 3.3 Secondary PCI Bu s Interface Signals Ta b l e 8 describes the secondary PCI bus interface signals. Th e letters in the “ Ty p e ” column are described in Ta b l e 1 .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 29 Signal Descriptions s_p a r TS Secondary PC I interface parity . Signal s_p ar carries the even parity of the 36 bits of s_ad[31:0] and s_cbe_l[3:0] for both address and data phases.
30 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Signal Descriptions 3.4 Secondary PCI Bu s Interface 64 - Bit Exten sion Signals Ta b l e 9 describes the secondary PCI bus interface 64-bit extens ion signals. The letters in the “ Ty p e ” column are desc ribe d in Ta b l e 1 .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 31 Signal Descriptions 3.5 Miscellaneous Signals Ta b l e 1 0 de scr ib es the miscellaneous s ignals. The letters in the “ T ype ” column are d escribed in Ta b l e 1 . s_p a r6 4 TS Secondary PCI interface upper 32 bits parity .
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 33 Address Decoding 4 This chapter presents the theo ry of operation information abo ut add res s mapping and deco ding. See Cha pter 1 6 for specific information about addressing registers. The f ollowing areas are covered : • Section 4 .
34 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding 4.1 CSR Address Deco ding The 21555 implements a set of CSRs tha t are mapped in memory o r in I/O space. The regis ters are mapped independently o n the primary and s econdary interfaces.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 35 Address Decoding 4.3.1 Using the BAR Setup Registe rs All downstream and ups tream BARs have pro grammable sizes, and can be d isabled so that they req uest no space.
36 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding 4.3.2 Direct Address T r anslation W ith the exception of secondary bus transacti ons falling into the Upstream Memory 2 addres s range (see Section 4.3.3 ) and all dual a ddres s trans actions ( Section 4.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 37 Address Decoding This new base addres s, also called the translated base add ress, references a new location in the secondary bus address map. The offset is not affected. The process is si milar for transactions forwarded f rom the second ary bus to the primary b us.
38 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding The Upstream Memo ry 2 address r ange consists of a fixed number (64) of pages. The page size is programmable in the Chip Control 1 conf iguration regi ster . Th erefore, the size of the Upstream Memory 2 B AR is dependent o n the page size.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 39 Address Decoding Figur e 7 shows how a translated address is bu ilt using the lookup tab le, assuming a page size of 4 KB . Figur e 8 shows an ex ample of how dif ferent address reg ions might be forward ed upstream using the lookup table address translation.
40 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding Note: The indirect access mechanism mu st be used only by one inter face at a time.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 41 Address Decoding Note: The lookup table is not cleared by reset. Th e lookup table must b e initialized by the local processor before the Upstr eam Memory 2 Address ran ge is used.
42 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding the Downstream memor y 3 address ran ge must be se t to a non-zero v alue when the upper 32 bits are enabled (a bas e address of 0 is no t allowed).
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 43 Address Decoding transaction. One pair is used for down stream I/O transactions an d one pair is used for upstream I/O transactions . The downstream r egisters can only be acc essed from the primary interface, an d the upstream regis ters can only b e accessed from the s econdary interface.
44 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding 4.4.2 Sub tractive Decoding of I/O T ransactio ns The 21555 can be enabled to sub tractively decode I/O trans actions and forward these transactions to the opposite bus. No address trans lation is performed on subtractively decoded I/O transactions.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 45 Address Decoding Accesses to the 215 55 con figuration space are not o rdered with respect to tr ansactions in the 2155 5 queues. T hat is, the 21555 responds immediately to con figu ration transaction s regardles s of what transactions exist in the ups tream and downstream queues.
46 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Address Decoding The 21555 provides a semaphor e method that may be used to guarantee atomicity o f the address and data register accesses using the Up stream Configuration Own bit and Downstream Configur ation Own bit.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 47 Address Decoding 4.6 21555 Bar Summary Ta b l e 1 2 shows a summary of the 2155 5 BARs. T abl e 12.
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 49 PCI Bus T ransactions 5 This chapter presents the theory of operation inf ormation about PCI trans actions. See Chapt er 16 f or specific information abou t PCI registers. Th e following sections are d iscussed: • Section 5 .
50 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions 5.2 Posted Write T ransactions This section discusses th e f oll owing Posted Write T ransactions: • Section 5.2.1, “ Memory W r ite T rans actions ” on page 51 . • Section 5.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 51 PCI Bus T ransa ct ions 5.2.1 Memory W rite T ransactions As a target, the 21555 disconn ects memory write transactions at the following add ress boundaries: • An aligned 4K B address boundary .
52 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions When any of these conditions is not met, the 21555 uses the memory write command. When a subsequent cache line in the transaction does not have all bytes enabled , the 21555 term inat es th e MWI transaction and delivers the remaining data using a memory write command.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 53 PCI Bus T ransa ct ions 5.2. 4.3 Write -Through When the 21555 is able to obtain access to the tar get bus and st art transferring write data to th e target before the transaction has been term inated on the initiator bu s, it automatically enters fl ow-through mode.
54 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions 5.3 Delayed Write T ransactions The 21555 uses delayed transactions when forwarding I/O writes from one PCI interface to the other .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 55 PCI Bus T ransa ct ions When the initiator repeats the transaction using the same address, bus command, write data, and byte enables, then the 21555 ret urns the appro priate tar get terminatio n when orderi ng rules allow .
56 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions The 21555 requests the target bus and initiates the delayed read transacti on as soon as the 21555 ordering rules allow . See Section 5.7 . When the transaction is a nonpref etchable read as described in Section 5.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 57 PCI Bus T ransa ct ions 5.4.2 Prefetchable Reads The following trans actions are considered by the 21555 to b e prefetchable read tran sactions: • T ransactions using the memory read line command.
58 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions When using the Quadwo rd bo un dary , REQ 64# asserts every time the transaction is Quadword-aligned ( AD[3:0] = x000b). In some cases, the addr ess is only 2 Dwor ds away from a cache line boundary , or a 4KB boundary .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 59 PCI Bus T ransa ct ions 5.4.4.3 Read Qu eue Ful l Thresh old T un ing The 21555 imp lements read queue management co ntrol bits for each read data queue in the Chip C ontrol 1 configuration register .
60 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions 5.6 T arget T erminations This section describes the following targ et retries, targ et disconnects, an d tar get aborts received and retu rned by th e 21555. • Section 5.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 61 PCI Bus T ransa ct ions 5.6.2 T ransaction T ermin ation Errors on the T arget Bus When the 21555 d etects a target abort o n the targ et bus, the 21555 sets the Received T ar get Abort in the Primar y and Secondary S tatus register .
62 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual PCI Bus Transact ions • A target retry in response to a posted write is allowed, but only due to temporary conditions, such as a buf fer-fu ll condition. The orderi ng rules ap ply to trans actions crossi ng the bridge i n the same dire ction.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 63 PCI Bus T ransa ct ions Note: Performance may b e affected if the Delayed T ransaction Order Control bit is set, as the 21555 deasserts the PCI r equest signal between trans actions.
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 65 Initialization Requirements 6 This chapter presents the theor y of oper ation in formation about the 21555 initializatio n requirements. See Chapt er 16 fo r specific in for m ation about the initializatio n registers.
66 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts 6.2 Reset Behavio r The 21555 implements a primary reset input, p_rst_ l , a secondary reset input s_rst _in_l , and a secondary reset output , s_ rst_l .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 67 Initialization Requirements The secondary res et output, s_rst_l , is asserted and remains ass erted when any of the fo llowing are true: • The 21555 pri mary rese t input, p_ rst _l , is asserted.
68 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts 6.2.1 Central Function Duri ng Reset The 21555 is selected to be the secondar y bus central function when it detects pr_a d[6] low when s_rst_l is asserted.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 69 Initialization Requirements 6.3.1 Wit h SROM, Local, and Host Processors The fol lowing is the 2 1555 initi alization proce dure usin g all configu ration m echanisms: 1.
70 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts The remainder o f the 21555 configuration pr oceeds as described in Section 6.3.1 . 6.3.3 Without Local Process or Initialization of the 21555 is poss ible without a local processo r, or without local processor intervention.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 71 Initialization Requirements 6.4.1 T ransi tions Between Po wer Managem ent St ates The 21555 is put into a different power state by w riting the Power State bits in the Power Managemen t Control and Status co nfi gura tion re giste r .
72 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts 6.4.3 Power Management Dat a Regi ster The PCI Power Management s pecification defines an optional data r egister that can be used for static or dynamic data repo rting.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 73 Initialization Requirements A CompactPCI hot-swap card also implemen ts an indicator LED. When the LED is on, this ind icates that the boar d can be removed f rom the slot. Software may choose to flash the LED to indicate an intermediate state as well.
74 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts The 21555 enters the Signal Insertio n state fro m the Ser ial Preload state when the following conditio ns are satisfied: • Serial pr eload is comple te. • Primary Lockou t Reset V alue bit cleared.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 75 Initialization Requirements When the INS_ST A T bit is cleared, the card is ready for normal o peration. When l_stat conti nues to be sampled low , that indicates that the ejector handle is closed ( and the micro -switch is open), meaning the card rem ains fully inserted.
76 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Initialization Requireme nts However , when the 21555 samples l_st at h igh once the INS_ST A T bit is cleared, this indicates that the ejector handle has been o pened. This is interpreted as a removal event, an d the 21555 enters the Signal Removal state instead.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 77 Clocking 7 The 21555 s upports t wo clock inp uts, p_cl k and s_c lk . The signal p_clk corresponds to the p rimary interface and s_clk correspon ds to the secondar y interface. Both clocks must adhere to the PCI Local Bu s specification.
78 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Clocking 7.2 21555 Secondary Clock Output s When the secon dary clock is not supplied i ndependentl y , the secondary cl ock output i mplemented on th e 21555 can be used in eit her s ynchron ous or as ynchro nous mode .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 79 Clocking 7.3 66 MHz Support The 21555 s upports 66 MHz operation. It has two p ins, p_m66ena and s_ m66en a , that indicate whether the primary and s econdary bus are operating at 66 MHz, respectively .
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 81 Parallel ROM Interface 8 This chapter presents the theory of operation inf ormation about the 21555 Parallel R OM (PROM) interface. See Chapt er 16 fo r specific information about the PROM registers.
82 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Paral lel ROM Int erface T able 2 1. PROM I nterface Signa ls (Sheet 1 of 2 ) Signal Name T ype Description pr_ad[7:0] TS These signals interface to both the serial and parallel external ROM circuitry and have multiple functions.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 83 Paral lel ROM Int erface pr_ale_l O PROM address latch enable/c hip select decoder enable. The signal p r_ale_l is used to enable the PROM address latc hes.
84 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Paral lel ROM Int erface 8.2 Parallel and Serial ROM Con nection Figur e 14 shows how a parallel an d serial R OM can be conn ected to th e 21555 . This fig ure illu st rates the connection of a 16MB ROM.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 85 Paral lel ROM Int erface When a byte read of th e PROM is perfor med, the 2 1555 follows this sequence on the ROM interface, als o shown in Figur e 15 . 1. The 21555 drives address b its [23:16 ] on the p r_ad[ 7:0] pin s and assert s pr_ale _l to enable the addr ess registers.
86 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Paral lel ROM Int erface 8.4 PROM Write by CSR Access Byte writes of the PROM can be per formed by CSR acces s of the T able 1 12, “ RO M C.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 87 Paral lel ROM Int erface . 8.5 PROM Dword Read A Dword read is performed on the PROM interface when a read is in itiated on the primary bus whose add ress falls into the address range defined by the Ta b l e 1 0 7 , “ Prima ry Exp ansi o n ROM BAR ” on page 175 .
88 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Paral lel ROM Int erface 8.6 Access Time and Strobe Control The 21555 controls both the access time and the read and write strobe timing thro ugh the ROM Setup CSR.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 89 Paral lel ROM Int erface 8.7 Att ac hing Additio nal Devices to the ROM Interface The 21555 allows add itional devices to be attached to the ROM interface.
90 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Paral lel ROM Int erface . Figure 18. Attaching Mu ltiple Device s on th e ROM In terface A7473-01 Other Device Selects Other Device Read Str.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 91 Serial ROM Interface 9 This chapter presents the theory of operation inf ormation about the 21555 Serial R OM (SROM) interface. See Chapt er 16 fo r specific information about the SROM registers.
92 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Serial RO M Interface 9.3 SROM Conf iguration Data Preload Format Some fields of the 21555 configur ation registers m ay be preloaded usin g the SROM interface.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 93 Serial RO M Interf ace Prior to a SROM write or write all transacti on, the 8-bit write data must be written in the ROM Data CS R. T o i nitiate the SROM access, the SROM Star t bit in the ROM Control CSR is written with a 1 (the P ROM Start bit must be written to a 0 with this access).
94 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Serial RO M Interface Note: When a SROM access using the CSR mechanism is attempted when the SROM is not implemented, the ROM interface may hang. This pre vents access to any PROMs that may be present.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 95 Serial RO M Interf ace Figure 22 . SROM Eras e Timing Diagram Figure 23 . SROM Eras e All Ope ration Figure 24 .
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 97 Arbitration 10 This chapter describes t he arbitrati on signal s. It also describes ho w the 21555 i mplements primar y and second ary PCI bus arbitration. See Chapt er 16 for s pecific information about the Arbiter r egisters.
98 21555 No n-Transpare nt PCI-to-PCI Br idge User Man ual Arbitration 10.3 Primary PCI Bus Arbitration The 21555 implements primary PCI bus request and grant pi ns, p_req_l and p_gnt_ l , that interface to an external primary bus arb iter . Thes e pins are used when the 2 1555 wants to initiate a trans action on the primary PCI bus.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 99 Arbitration . Each bus master , including the 2155 5, may be configured t o be in either the low prior ity group or the high pr iority group by setting the corresponding priority bit in the Arbiter Control register in device-specific configuration space.
100 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Arbitration The 21555 ’ s inter nal arbiter may be progr ammed to park the secondary PCI bus either at the last master to us e the bus, or always on the 21 555 .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 101 Interrupt and Scratchpad Registers 11 This chapter presents the theor y of oper ation in formation about the 21555 inte rrupt han dling and about the 32-bit scratchpad registers. See Chapt er 16 fo r specific information about these reg isters.
102 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Interrupt and Scratc hpa d Registers — Cleared by writ ing a 1 to the corresponding status bit in the Upstream Page Boun dary IRQ 0 or 1 regist ers. — Asserts s_inta _l when the corresponding mask bit is zero.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 103 Interrupt and Scratc hpad Registers 1 1.3 Do orbell Interru pt s A 16-bit software controlled interrupt request register and an associated 1 6-bit mask register is implemented for each interface (primary and secondary).
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 105 Error Handling 12 This chapter presents the theory of operation information about the 21555 Error handling capability . See Chapt er 16 for specif ic informati on about t he Error regis ters.
106 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Error Hand ling 12.1.2 Second ary PCI Bus Erro r Signals Ta b l e 2 8 describes the s econdary PCI b us error signals . T able 2 8. Sec ondary PCI B us Ar bitration Si gnals Signal Name T ype Description s_perr_l STS Secondary PCI interface PERR# .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 107 Error Hand ling 12.2 Parity Errors The 21555 ch ecks, forwards , and generat es parity on both the pr imary and s econdary buses . When forwar ding transactions, the 21555 forwards the data parity cond itio n as queued, whether it is bad parity or good par ity .
108 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Error Hand ling Data P ar ity Error on Primary Bus Downstream Delayed Write 0 | — • Queues and forwards transac tion with parity error . • Sets primary Pa rity Error D etected bit. 1 | — • Returns TRDY# (and STOP # when multiple data phases requested).
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 109 Error Hand ling Dat a Pari ty Error on Secondary Bus Downstream Posted Write — | 0 T ransaction complet es normally on secondary bus . — | 1 • Transaction completes on secondary bus. • Sets secondary Data Parity Detect ed bit when s_perr_l is asserted.
110 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Error Hand ling 12.3 System Error (SERR#) Reporting The 21555 has two sys tem error pins . Signal p_serr_l r eports system erro rs on the pr imary interface, and s_serr_l reports s ystem errors on the secondary interface.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 111 JT AG T est Port 13 This chapter presents the theory of operatio n information about the 215 55 JT AG interface. See Chapt er 16 for specific information about the JT AG registers. The 21555 ’ s implementation of the JT AG test port is according to IEEE S td.
112 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual JT AG Test Port 13.2 T est Access Port Co ntroller The test access port con troller is a finite-state machine that interp rets IEEE 1 149.1 pro tocols received t hrough th e tms signal. The s tate transitions in the contr oller are caused by the tms signal on the rising edge of tck .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 113 I2O Support 14 This chapter presents the theory of operatio n information about the 2 1555 I20 suppo rt.
114 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual I2O Support The 21555 implements the following hardware for t he Inbound Q ueue: • T able 85, “ I2O Inbo und Queue ” on page 166 register at C SR offs et 40h. • T able 87, “ I2O Inbo und Free_Lis t Head Pointer ” on page 167 at CSR offs et 48h.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 115 I2O Support processor removes the mes sage from the Inbound Pos t_List, i t must writ e bit 31 of the Inbou nd Post_List counter with a 0, which causes the 2 1555 to decrement the In bound Post_List counter by 1.
116 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual I2O Support and asserts p_inta_l to indicate to the host pr ocessor that one or more MF A s exist in the Outb oun d Post_List .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 117 I2O Support • All MF A coun ters m aintained by the 21555 may be individually lo aded with any data value by writing a 1 to bit 31 of the corresp onding cou nter Dword of fset.
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 119 VPD Support 15 This chapter presents th e theor y of oper ation in for m atio n about the 21555 V ital Product Data (VPD) support. See Chapt er 16 fo r specific information about the VPD registers.
120 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual VPD Support 15.2 W riting VPD Inform ation A write can occur on ly to the last 2 Kb (256 bytes) of VPD Space. V alid VPD byte addresses fo r write operations are 17F:080h. T o wr ite VPD in formation from the serial RO M, the following steps m ust be taken : 1.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 121 List of Registers List of Registers 16 This chapter contains r eference infor mation abou t all of the 215 55 regist ers. Ta b l e 3 1 is a cross reference between the sections in this chap ter to there accompanying th eory of oper ation chapters.
122 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers • “ Vi a S e t u p ” refers to the base ad dress setup regist er corresponding to that BAR 16.2 Configu ratio n Registers Ta b l e 3 2 lists the configuration space addres s registers.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 123 List of Registers 2F: 2E 6F: 6E Subsystem ID R egister , page 154 0000 Y Secondary Y 33:30 (P) 73:70 (S) Primary Expansion ROM BAR, page 175.
124 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 7D (P) 3D (S) Primar y and Secondary Interrupt Pin Registers, page 155 00 — NY 7E (P) 3E (S) Primary a nd Secondary Minimu.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 125 List of Registers C7: C4 Downstream I/O or Memory 1 and Upstream I/O or Memory 0 Setup Registers, page 138 0000000 0 Y Secondary Y CB:C 8 Do.
126 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.3 Control and St atus Registers The control and status registers are memory mapp ed in the Primary CSR and Memory 0 Base Address window and the Secondary C SR Base Address window .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 127 List of Registers 01B:018 Downs tream I/O Data and Upstream I/O Data Registers, p age 145 Downstream I/O Data Indeterminate Primary P rimary.
128 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 057:054 I2O Out bound Post_List Head Pointer , page 167 I20 Outbound Post Head Pointer Indeterminate Y Y 05B:058 I2O Inbound.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 129 List of Registers 093:090 Upstream Page Boundary IRQ M ask 0 Register , page 172 Upstream Page Boundary IRQ M ask 0 FFFFFFFF Y Y 097:094 Ups.
130 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.4 Address Deco ding 16.4.1 Primary and Secondary Address This secti on covers pages 16-130 throug h 16-140 and includes tables Ta b l e 3 4 throug h Ta b l e 6 0 . See Chapter 4 for theory of operation inform ation.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 131 List of Registers 3 Prefetchable R Indicates whether the region is prefetchable. Acces ses to the 21555 r egisters are disconnected after the f irst data phase. • When 0, nonprefe tchable memory is request ed.
132 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 3 Prefetchable R Indicates if this space is pr efetchable. • When a 0, do not use pref etching when reading the 21555 registers.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 133 List of Registers T able 37 . Downstream I/O or Memory 1 and Upstream I/O or Memor y 0 BAR Bit Name R/W Description 0 S pace Indicator R • When a 0 , this BAR is disabled or memory space is requested memory spa ce.
134 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 3 8. Downstr eam Memory 2 and 3 BAR , and Upstream Me mory 1 BAR Bit Name R/W Description 0 Space Indicator R Reads only as 0 to indicate that me mory space is requested.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 135 List of Registers T abl e 39. Up per 32 Bits Downstrea m Memory 3 Bar • Primary byte offset: 27:24h • Secondary byte offset: 67:64h Bit .
136 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers Ta b l e 4 1 . Downst ream I/O or Memo ry 1 and Up stre am I/O or Memor y 0 T ran slate d Base Regist er Bit Name R/W Description 5:0 Reserved R Res erved. Returns 0 when read.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 137 List of Registers Ta b l e 4 2 . Downstream Memory 0, 2, 3, and Up strea m Memory 1 T ran slated Bas e Regist er These registers contain the translated base addresses for their respective downstream and upstream BARs.
138 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 4 3. Downstr eam I/O o r Memory 1 and Upstream I/O or Me mory 0 S etup Regist ers These register s may be preloaded by serial ROM or p rogrammed by the local process or before host con figu rat ion.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 139 List of Registers T abl e 44. Do wnstre am Memory 0, 2, 3, an d Up stream Memory 1 Setup Re gisters These registers are u sed to program the type and size of their respective ups tream and downstream BA Rs .
140 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.4.2 C onfiguratio n T ransaction G eneration Registers All of these reg isters are mapped in to the 21555 configuration s pace and described in Section 16.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 141 List of Registers . T abl e 46. Do wnstre am and Upstream Configu ration A ddress Regis ters This section describes both the downst ream and upst ream versions of the registers. Th ese registers are also map ped in memory and I /O space.
142 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 47. Downstream Configuration Data and Up stream Configuration Dat a Registers These registers are also mapped in memory and I /O space. This register is treated as a reserved register for all memory accesses.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 143 List of Registers 7:1 Reserved R Read only as 0. 8 Upstream Configuration Own Bit R0TS (S) R(P) Indicates ownership of the U pstream Configuration Addres s and Upstream Configuration Data registers.
144 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 9 Upstream Configuration Control R/W Enables the 21555 to perform upstream indirect configuration transactions. • Whe n 0, t he 21555 will not initiate a configuration transaction on the primary interface when the Upstream Configuration Data regist er is accessed.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 145 List of Registers T abl e 51. Do wnstre am I/O Data and Upstream I/O Da t a Regist ers The Downstream I/O Data register is used for I/O transacti ons to be initiat ed on the secondary bus, and the Ups tream I/O Data register is used for I/O transactio ns to be initiated on the primary bus.
146 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers Ta b l e 5 3 . I / O C S R • Byte Offset: 027:026h Bit Name R/W Description 0 Downstream I/O Own Bit S tatus R This bit reflects the status of the Secondary Own bit used for generating I/O transaction on the secondary bus.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 147 List of Registers 16.5 PCI R egisters This sectio n covers p ages 16-147 through 16-165 and Ta b l e 5 7 through Ta b l e 8 0 . S ee Chapter 3 or Cha pter 5 for theory of operation in formation.
148 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 5 7. Pri mary Int erface Con figuration Sp ace Addre ss Map Byte 3 Byte 2 Byte 1 Byte 0 Primary Offset Secondary Offs.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 149 List of Registers 16.5.2 Primary and Secondary Command Register s The register types in this section have s eparate regist ers for the primary and secondary interf aces.
150 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 7 Wa i t C y c l e Control R Reads as zer o to indicate the 21555 does not p erform address or data stepping. 8 SERR# Enable R/W Controls the enable for SERR# on the corresponding interface.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 151 List of Registers 8 Data P arity Det ect ed R/ W1 TC This bit is set to a 1 when all of the following are true: • The 21555 is a master on t he corresponding bus. • PERR# is detected asser ted for writes or a parity error is detected for reads.
152 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 64. Primary and Secondary Class Code Registers These registers may be preloaded through the serial ROM. The Primary Class Code register may also be programmed by the local processor before host configuration .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 153 List of Registers T abl e 66. Primary La tency an d Secon dary Mas ter Latenc y Timer Register s Bit Name R/W Description 7:0 Master Latency Ti m e r R/W Master latency timer for the corresponding interface.
154 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers Pr T able 69. Subsystem V endor ID Register • Primary byt e offset: 2D:2Ch and 6D:6Ch • Secondary byt e offset: 6D:6Ch and 2D:2Ch Bit Name R/W Description 15:0 Subsystem V endor ID R/ (WS ) Identifies the vendor of the add - in card or sub system.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 155 List of Registers T able 73. Primary and Secondary Interrupt Pin Registers Bit Name R/W Descriptio n 7:0 Interr upt Pin R Thi s register indicates which P CI interrupt pin the 21555 uses on the corresponding bus.
156 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.5.3 De vice - S pecific Control and S t atus Regist ers This section contains information about the device-s pecific control and status registers.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 157 List of Registers 3 Secondary Master Timeout R/ W Sets the maximum number of PCI clock cycles that the 21555 wait s for an initiator on the secondary bus to repeat a delayed transaction request.
158 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 8 Upstream DAC Prefetch Disable R/W Controls prefetching for upstream dual address transacti ons using the memory read b us comm and. Whe n 0, prefetching is perform ed for upstream DAC memo ry reads.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 159 List of Registers 12 LUT Page Size Extension Bit R/ W Allows selection of larger p age sizes when programming the page size field in the Chip Control 1 configuration register . • When 0, page sizes 256 bytes through 4 MB are available in t he p age size field.
160 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 7 8. Chip Control 1 R egister (Sheet 1 of 3) This register may be preloaded by serial ROM or programmed by the local proces sor before hos t configuration.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 161 List of Registers 7:6 Subtractive Decode Enable R/W Controls subtractive dec oding for downstream and upstream I/O transactions. When the 21555 is enabled to perform subtractive decoding in one direction, those transactions are forwarded to the opposite bus with no address translation.
162 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 12 I 20_ENA R/W Enables the I20 message unit. • When 0, the I20 message unit is disabled. Memory accesses to the Inbound and Outbound FIFO registers at CSR offset s 40h and 44h result in TRDY# and discarded data on writes, and TRDY# wi th a return of FFFFFFFFh on r eads.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 163 List of Registers 3 Downstream Posted Write Data Discarded R/W1 TC This bit is set t o a 1 an d p_serr_l is conditionally asserted when the .
164 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 80. Generic Own Bits Register The 21555 implem ents two generic own bits that can be accessed in either memory or I/O space fro m either the primary or secondary interface.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 165 List of Registers 16.6 I2O Registers This section contains a description of the I2O registers. See Chapter 14 for theory of operation information . T able 81. I2O Outbound Post_List S t atus Byte Offset: 33:30h Bit Name R/W Descriptio n 2:0 Reserved R Reserved.
166 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 84. I2O Inbound Post_List Interrupt Mask Byte Offs et: 3F : 3 C h Bit Name R/W Description 2:0 Reserved R Reserved. Read only as 0. 3 Inbound Post Mask R/W Interrupt mask for Inbound Post_List S tatus.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 167 List of Registers T able 87. I2 O Inbound Free_List Head Pointer Byte Offsets: 04B:048h Bit N ame R/W Description 1:0 R eserved R Reserved. Returns 0 when read. 31: 2 Inbound Free Head Ptr R/W S pecifies the local me mory Dword addr ess of the Inbound Free_List Head Pointer .
168 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 91. I2O Inbound Post_List Counter Byte Offsets: 05B:058h Bit Name R/ W Description 15:0 I nbound Post Ctr R/(WS) When read, returns the number of entries in the Inbound Post_List.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 169 List of Registers T able 93. I2 O Outbound Post_List Counte r Byte Offsets: 063:060h Bit Name R/W Description 15:0 Outbound Post Ctr R/(WS) When read, returns the number of entries in t he Outbound Post_List.
170 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.7 Interrupt Registers This section contains informatio n about inter rupt registers. See Chapt er 1 1 for theory of operation information . T abl e 95. Chip St atus CS R Byte Offsets: 083:082h Bit Name R/W Description 0 PM_D0 R/W1 TC Power Management Tr ansi tion to D0.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 171 List of Registers T abl e 97. Ch ip Clear IRQ Mask Register Byte Offsets: 087:086h Bit Name R/W Descri ption 0 Clr_D0M R/W1 TC • When 0, s.
172 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 9 9. Upstream Page Bo undary IRQ 1 Regist er Byte Offs et: 08F : 08C h Bit Name R/W Description 31:0 P AGE1_IRQ R/W1 TC Each bit in this register corresp onds to a page entry in the upper ha lf of the Upstream Memory 2 range.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 173 List of Registers T abl e 102. Primary Clear IRQ a nd Sec ondary Clear IRQ Reg isters These registers affect primary and secon dary interrup ts in the same way and are des cribed together.
174 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.8 Scratchp ad Registers See Chapte r 1 1 for theory of operation i nformatio n.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 175 List of Registers 16.9 PROM Registers This secti on describes the six PR OM registers. See Chapt er 8 for theor y of operati on informat ion. . 31:0 S CRA TCH3 R/W 0B7:0B4h 3 2-bit scratchpad register 3.
176 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 108. Primary Exp ansion ROM Setup Register This register may be preloaded by serial ROM or programmed by the local proces sor before hos t configuration.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 177 List of Registers T abl e 109. ROM Se tup Reg ister Byte Offsets: 0C9:0C8h Bit Name R /W Descri ption 1:0 Acc ess Time R/W Number of p_clk cycles that pr_cs_l asserts low (in default mode) or pr_ale_l drives high (in multiple device mode ) for a PROM or other ext ernal device access.
178 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 1 1 1. ROM Add ress Reg ister Byte Offs ets: 0C E: 0 C C h Bit Name R/W Description 23:0 ROM_A DDR R/W Contains the byte address of the PROM read or write access us ed when the PR O M Start bit is set to a 1.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 179 List of Registers 16.10 SROM Registers This sections describes the SROM re gisters. See Chapter 9 for theory of operation informatio n. 2 Read/Write Control R/W PROM read/write control bit. This bit may be written with the same CSR access that sets the PROM S tart bit.
180 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 3 s_clk_o Enable R Indicates whether s_clk_o is enabled, determined by sampling pr_ad[5] during reset. • When 0, signal p r _ad [5] was s ampled low , causing s_clk_o to be disabled.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 181 List of Registers 09h Subsyste m ID [ 7:0] 0Ah Subsystem ID [15:8] 0Bh Primary Minimum Grant 0Ch Primary Maxim u m Laten cy 0Dh Secondary Pr.
182 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 2Bh Upstream I/O or M emory 0 S etup [31:24] 2Ch Upstream Memory 1 Setup [7:0]. Bits [0, 7:4] are not loaded and should be 0. 2Dh Upstream Memory 1 Setup [15:8]. Bits [1 1:8] are not loaded and should be 0.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 183 List of Registers 16.1 1 Arbiter Contro l This chapter describes the arbitration contro l registers. See Ch apter 1 0 for theory of operation information. 16.12 Error Registers This section describes the primary and se condary SERR# disabl e registers.
184 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 1 16. Primar y SERR # Disable Register This register may be preloaded by serial ROM or programmed by the local proces sor before hos t configuration. This register controls the ability of the 21 555 to assert p_serr_l for a particular condition.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 185 List of Registers 16.1 3 Init Registers This section describes the Power management, Reset, and Hot-swap registers.
186 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers . T able 1 19. Power Ma nagement Capabilities Registe r Bits [14:9,5,2:0] are loadable through t he serial ROM or are program mable by the local processor .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 187 List of Registers T able 120. Power Management Control and S t atus Register Bits [14:13] are loadable by serial ROM or are programmable by the local processor . • Primary byte offset: E1:E0h • Secondary byte offset: E1:E0h Bit Name R/W Descripti on 1:0 PWR S t at e R/W Power S tate.
188 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers T able 1 22. Pow er Mana gement Data Register • Primary byt e offset: E3h • Secondary byt e offset: E3h Bit Name R/W Descri ption 7:0 PM Data R P ower Managem ent Data register .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 189 List of Registers T abl e 124. CompactPCI Hot - Swap C ap ability Iden tifier and Next Pointer Re gister Bit Name R/W Description 7:0 H S ECP ID R Enhanc ed capabilities ID. Reads only as 06h to indi cate that these are CompactPCI Hot - Swap registers.
190 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers 16.14 JT AG Registers This chapter presents the theory of operation information about the 21 555 JT AG registers. See Chapt er 1 3 for theory of operation informatio n. 5:4 Reserved R Returns 0 when read.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 191 List of Registers T able 129. Boundary Scan Ord er TBD ta ble lists the boundary- scan regist er order and the group di sable control s. The group disable con trol either enables or tristates i ts correspondi ng group of bi-dir ectional dri vers.
192 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual List of Registers The grou p disable n umb er column in TBD shows w hic h group dis able bi t co ntro ls the c orr espo ndin g out put dr ive r . Group disable bits do not af fect in put-only p ins, so those p ins have a bl ank rather t han a group number in t hat column.
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 193 List of Registers T able 131. Vi tal Pr oduct Data (VPD) Address Register • Primary byte offset: E7:E6h • Secondary byte offset: E7:E6h Bit Name R/W Description 8:0 VPD Add r R/W Vit al Product Data Address.
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21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 205 Acronyms A • 1D – One-dimensiona l • 2D – T wo- dim ens i onal • AGP – Accelerated Graphics Port • ANS I – American National.
206 21555 Non-Tr ansparent PCI-to -PCI Bridge User Manual Acronyms • MF As – Message Frame Addresses • MPEG – Moving Pictures Exp erts Group • MV – Motion vector • MVC – Part C ontrol .
21555 No n-Transparent PC I-to-PCI Bridg e User Ma nual 197 Index 3-V 1 5 5-V 1 5 Primary loc k ou t bit on the PROM_AD 82 A Add-i n c ard ve ndor s 15 address 33 Addre ss range l ocat ions Primary B .
198 21555 Non-Tra nsparent PCI-to-PCI Bridge U ser Manual Prima ry Lock out b it action befo re cl eari ng the 130 powe r mana gement 71 with serial Prelo ad 69 with SROM o peration 69, 70 Primary lo .
An important point after buying a device Intel 21555 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Intel 21555 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Intel 21555 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Intel 21555 you will learn all the available features of the product, as well as information on its operation. The information that you get Intel 21555 will certainly help you make a decision on the purchase.
If you already are a holder of Intel 21555, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Intel 21555.
However, one of the most important roles played by the user manual is to help in solving problems with Intel 21555. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Intel 21555 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
