Instruction/ maintenance manual of the product Frequency Generator Xilinx
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Frequency Generato r for Spartan-3E S tarter Kit Ken Chapman Xilinx Ltd 18 th July 2006 Rev.1 With special thanks to Peter Alfke and Alireza Kaviani..
Frequenc y Gen erator f or the S parta n-3E St arter Kit 2 Limited Warranty and Disclaimer . These desig ns are provid ed to you “as is”. Xili nx and its licenso rs make and you rece ive no warran.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 3 Design Ove rview This desi gn conv erts th e Spart an-3E Starter Kit into a reaso nably accurate freque ncy gen erator covering t he n ominal ran ge 1Hz to 1 00MHz.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 4 Operating Instructions Output frequ ency provided on SMA conn ector (J1 7) and J 4_IO12 . In this m ode rot ating t he kn ob to the lef t or right will cause the di splay cursor to m ove in t he corre spondin g directi on on the upper lin e of t he display.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 5 PicoBlaze Des ign Size The imag es an d statisti cs on t his pag e show t hat t he de sign o ccupies ju st 172 slices, 1 BRAM and 2 DCMs. This is only 3. 7% of t he slice s availa ble in an XC3S5 00E d evice.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 6 Design F iles The sou rce files pr ovided for the referen ce desi gn are ….. frequency _generator. vhd Top lev el file an d main description of ha rdware. Contain s I/O req uired to disable Strat aFLASH mem ory device on th e boar d which may otherwise interfere with the LCD displ ay.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 7 Direct Digital Synthesis (DDS) Circuit Diagram 32-Bit Counter CLKIN 50MHz clk BUFG phase_acc_d cm DCM The first DCM is u sed to multiply th e 50MHz cl ock by a factor or 4 an d form a 200MHz cl ock.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 8 PicoBlaze Circuit Diagram strataflash_oe strataflash_ce strataflash_we Vcc * * * * Strat aFLASH mem ory must be disable d to prevent interfere nce with the LCD display. interrupt_control ‘JTAG_load er’ allows rapi d PicoBlaze code devel opment.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 9 Phase Accumulator Waveforms The foll owing wave forms were obtaine d by m onitoring the o utput of t he ph ase a ccumulator present ed on stake pin ‘J4-I O9’.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 10 Phase Accumulator Spectrum An alt ernative w ay to o bserve t he q uality of the w aveforms sy nthesise d by t he ph ase a ccumulator is to loo k at t he freq uenc y spectr um.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 11 Final Output Waveforms These w aveforms were obtai ned fr om stake pin ‘J4-IO 12’ and reflect the fi nal out put of the freque ncy gen erator.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 12 Final Output Spectrum Observing the fr equen cy spectrum of th e final outpu t reveal s that y ou ca n not get somethin g for n othing and helps us to underst and wh en th e frequ ency aligned mode should and should not be us ed.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 13 Setting DCM Frequency Aligned Mode To set t he DCM int o the f requen cy align ed mod e of operati on a s pecial o ption m ust be used during c onfigura tion file gene ration. This can be s et in th e ISE tools as shown i n the se screen shot s from an ISE v 8.
Frequenc y Gen erator f or the S parta n-3E St arter Kit 14 Exercises, Experiments and Suggestions Here are some exe rcises, ex periments and su ggest ions for y ou to consid er based on t his refere nce d esign.
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If you already are a holder of Xilinx Frequency Generator, 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 Frequency Generator.
However, one of the most important roles played by the user manual is to help in solving problems with Xilinx Frequency Generator. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Xilinx Frequency Generator 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
