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Xilinx Frequency Generator manual

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Table of contents for the manual

  • Page 1

    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.[...]

  • Page 2

    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 warranties or con ditions, express , implied, statutory or otherw ise, and Xilin x specifically di sclaims any impli ed warranti es of merchantabil ity, non[...]

  • Page 3

    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. The desig n allows you to at tempt g enerati on of highe r frequen cies to allow y ou to ex periment with the maximum p erform[...]

  • Page 4

    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. Use this mod e to position the cu[...]

  • Page 5

    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. M ore significan tly, th is slice coun t can b e redu ced t o less t han 32 when i[...]

  • Page 6

    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. Pic[...]

  • Page 7

    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. This give s the phase accumul ator a tim ing resolu tion o f 5ns. CLKFX CLKFX_MULTIPLY=4 CLK[...]

  • Page 8

    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. port_id kcpsm3 processor instruction write[...]

  • Page 9

    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’. In e ach c ase th e digital storage oscilloscope was set to infi nite pe rsistenc e in orde r captu re any fluctuat ions ov er t[...]

  • Page 10

    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. I was lu cky eno ugh to hav e a 2 048-p oint FFT f eature on my o scilloscope which allows some simple observa ti[...]

  • Page 11

    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. Once aga in the digital stor age oscilloscope was set to infi nite pe rsistenc e in orde r captu re any fluctuat ions ov er time an d ther efor[...]

  • Page 12

    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. I have u sed t he infi nite persist ence di splay ag ain and[...]

  • Page 13

    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 8.1i proj ect for t his refere [...]

  • Page 14

    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. A lthoug h sev eral are sp ecific to the S parta n- 3E St arter Kit, most are portabl e to yo ur own board s and design s where I hope yo[...]