Instruction/ maintenance manual of the product ML403 Xilinx
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XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 1 © 2007 Xilinx, Inc. All rights reser v ed. All Xilinx trademarks, registered trademarks, patents , and fur ther disclaimers are as listed at http://www .xilinx.com/legal.htm . P owerPC is a trademark of IBM Inc.
Introduction XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 2 R Intr oduction This application note accompanies a ref erence system built on the ML403 de velopment board. Figure 1 is a bloc k diagram of the ref erence system. The system uses the embedded P owerPC (PPC) as the microprocessor and the OPB IIC core .
Introduction XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 3 R Figure 4 shows the f or mat of the data transf er of two bytes on the IIC b us, beginning with the ST ART (S) condition and ending with the ST OP (P) condition, bounded by an idle IIC (F) b us.
Reference System Specifics XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 4 R Figure 6 shows the ac knowledge bit on the IIC bus . Figure 7 shows b us arbitration of two masters. The IIC b us is a multi-master bus . Masters monitor the IIC bus to determine if the bus is activ e.
Reference System Specifics XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 5 R ML403 XC4VFX12 Address Map OPB IIC Registers Ta b l e 2 provides the register map f or the OPB IIC core. Ta b l e 3 provides a description of the OPB IIC control register .
Reference System Specifics XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 6 R Status Register (SR) This register contains the status of the OPB IIC Bus Interf ace. All bits are cleared upon reset. Ta b l e 4 provides a definition of the status register .
Reference System Specifics XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 7 R Ta b l e 5 provides a register description of the Interr upt Status register .
Reference System Specifics XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 8 R Configuring the OPB IIC Core Figure 8 shows ho w to specify the values of IIC generics in EDK. T o access the dialog bo x in the figure, doub le click on the OPB IIC core in the EDK System Assembly Vie w .
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 9 R is ‘1010 f or read and wr ite operations . The A2, A1 bits are dont cares. The A0 bit is used b y the master de vice to select which of the two 256-word bloc ks of memor y are accessed.
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 10 R The resistors are located on the board as shown in Figure 12 . Figure 12: ML40x Resistors X979_12_022 3 07.
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 11 R If additional IIC de vices are connected to the bus via the e xpansion header as shown in Figure 13 , inser t additional pull-up resistors on the e xter nal signals connected at pins 31 and 32.
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 12 R Figure 14 shows the FPGA pins driving the IIC Bus. T otalPhase Aard vark Adapter In the ref erence design, the OPB IIC in the XC4VFX12 on the ML403 board interfaces to the IIC in the Aardvark Adapter .
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 13 R Figure 15 shows the Aardv ar k Control Center GUI. Interfacing to the OPB IIC on the ML403 Boar d to the Aar dv ark Ada.
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 14 R 3. Inv oke XMD and connect to the MicroBlaz e processor by the f ollowing command: xmd -opt xapp.opt 4. Download the e xecutab le by the f ollowing command dow <path>/executable.
ML403 Board Inf ormation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 15 R low_le vel_dynamic_eeprom : This project transmits and receiv es data using the low le vel (L0) software driver . The OPB IIC is the master and the 24LC04 is configured as the slav e.
Running the Applications XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 16 R Figure 18 shows the slav e example . The message is in transmit.txt, and is the sentence "Lester was here .". The transaction log matches the message. The address is 0x70.
Running the Applications XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 17 R Select dynamic_eepr om and r ight clic k to build the project. If more than one softw are project is used, make the un used software projects inactive . Connect a serial cable to the RS232C por t on the ML403 board.
Using ChipScope with OPB IIC XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 18 R Using ChipScope with OPB IIC T o facilitate the use of ChipScope to analyz e OPB IIC hardware, the iic.cdc file is included in the ml403_ppc_opb_iic/chipscope director y .
Using ChipScope with OPB IIC XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 19 R 5. Figure 23 shows the GUI f or making net connections. Clic k Next to mov e to the Modify Connections window . If there are any red data or trigger signals, correct them.
Using ChipScope with OPB IIC XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 20 R The wa vef or m view er is more readable when buses r ather than discrete signals are displa yed. The Re verse Bus Order operation belo w Add to Bus in the figure can be useful in analyzing ChipScope results.
Linux Kernel XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 21 R 13. ChipScope results are analyzed in the w avef or m windo w as shown in Figure 25 . The wa vef or ms ma y be easier to read if the discrete signals are removed after the y are renamed.
Linux Kernel XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 22 R 5. Under OS and Libraries , set the entries as shown in Figure 26 . V erify that the target director y is the same as the director y containing the Linux source .
Linux Kernel XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 23 R 6. Click Connect_P eriphs and add the OPB_INTC , OPB_SYSA CE, OPB_IIC, OPB_SPI, OPB_IIC , and OPB 16550 per ipherals , using the instance names shown in Figure 27 . Click OK . 7. Select Software → Generate Libraries and BSPs to generate the LSP in ml403_ppc_opb_iic/linux .
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 24 R command from the command prompt: impact -batch etc/download.cmd 12. Inv oke XMD . From the ml403_ppc_opb_iic/linux directory , enter the f ollowing commands in the XMD window . rst dow arch/ppc/boot/images/zImage.
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 25 R In most cases, after data is transmitted, the test w aits for an interrupt from the OPB IIC .
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 26 R The simulation runs f or 2000 ns as shown in Figure 29 . There are 3 sections in the simulation, shown in the f ollowing figures.
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 27 R In the first test, which is shown in Figure 30 , the OPB IIC registers are read to v er ify the correct reset v alues. The interrupt registers are written and read. This occurs from 0 - 10 s .
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 28 R Figure 31 provides the Arbitration Lost test code . This pseudo-code can be track ed in the simulation.
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 29 R The second test, shown in Figure 32 , runs from 575 s to 790 s ., Ths master , AA, receives 3C and 55 from 20.
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 30 R Figure 33 provides the test code used in the simulation with the OPB IIC with the AA address as the master .
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 31 R Figure 34 shows the third test sho wn in opb_iic.wlf , run from 800 - 2000 us. IIC_20 is the master writing to IIC_AA, which is a 10-bit slav e.
Simulation XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 32 R Figure 35 provides the test code f or simulation with IIC_AA as master . Figure 35: T est Code for Simulation with iic_20 as Master w.
References XAPP979 (v1.0) F ebruar y 26, 2007 www .xilinx.com 33 R References DS434 OPB IIC Bus Interf ace (v1.02a) XAPP765 Getting Star ted with EDK and MontaVista Linux ML40x Embedded De velopment Platf or m User Guide UG080 (v2.5) May 24, 2006 ChipScope ILA T ools T utorial The IIC Bus Specification V ersion 2.
An important point after buying a device Xilinx ML403 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Xilinx ML403 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 Xilinx ML403 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Xilinx ML403 you will learn all the available features of the product, as well as information on its operation. The information that you get Xilinx ML403 will certainly help you make a decision on the purchase.
If you already are a holder of Xilinx ML403, 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 Xilinx ML403.
However, one of the most important roles played by the user manual is to help in solving problems with Xilinx ML403. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Xilinx ML403 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
