| 1 | usb_jtag using Cypress FX2 chip
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| 2 | ===============================
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| 3 |
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| 4 | == General information ==
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| 5 |
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| 6 | The code in this directory is for Cypress FX2 (e.g. CY7C68013A) and can be
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| 7 | compiled with the SDCC compiler (I tried version 2.6 as shipped with Ubuntu
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| 8 | 6.10). Once I had a version that could be compiled with Keil tools (until early
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| 9 | 2007), but switched to SDCC because I usually develop on a Linux host.
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| 10 |
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| 11 | No logic beside the FX2 itself and only a few external components are required
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| 12 | for a basic JTAG adapter. I don't have detailed schematics available; my test
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| 13 | setup consists of a FX2 on a custom board where it's directly connected to a
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| 14 | Cyclone FPGA.
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| 15 |
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| 16 | ____________
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| 17 | | |
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| 18 | | Cypress |
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| 19 | USB__| EZ-USB FX2 |__JTAG(TDI,TDO,TCK,TMS)
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| 20 | | CY7C68013A |
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| 21 | |____________|
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| 22 | __|__________
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| 23 | | |
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| 24 | | 24 MHz XTAL |
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| 25 | |_____________|
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| 26 |
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| 27 |
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| 28 | Similar boards are available from fpga4fun.com - the boards named "Saxo-L" and
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| 29 | "Xylo-EM" are pre-wired for use with an adapted version of my code, while
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| 30 | "Saxo" and "Xylo" can be used after soldering 4 extra wires:
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| 31 |
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| 32 | http://www.fpga4fun.com/board_Xylo.html
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| 33 |
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| 34 | There's a discussion thread in the fpga4fun forum about this firmware:
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| 35 |
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| 36 | http://www.fpga4fun.com/forum/viewtopic.php?t=483
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| 37 |
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| 38 |
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| 39 | == Adapting the code to your hardware ==
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| 40 |
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| 41 | As is, the code assumes the following pin assignment:
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| 42 |
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| 43 | Port C.0: TDI
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| 44 | Port C.1: TDO
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| 45 | Port C.2: TCK
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| 46 | Port C.3: TMS
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| 47 |
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| 48 | Other assignments are possible. If you have your signals connected to
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| 49 | bit-addressable I/O pins (port A,B,C or D), I suggest you make a copy of
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| 50 | hw_basic.c and adapt the definitions and ProgIO_Init() in it to your needs.
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| 51 | The file hw_saxo_l is even simpler to adapt if you want only JTAG and no AS/PS
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| 52 | mode. If your signals are not on bit-addressable I/Os (that is, you're using
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| 53 | port E), you could base your adaptation on the slower hw_xpcu_i.c. You may
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| 54 | specify the name of your adapted hardware-specific file when "make"ing, e.g.:
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| 55 |
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| 56 | make HARDWARE=hw_saxo_l
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| 57 |
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| 58 |
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| 59 | The USB identification data (vendor/product ID, strings, ...) can be modified
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| 60 | in dscr.a51. The firmware emulates the 128 byte EEPROM that usually holds
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| 61 | configuration data for the FT245 and which can be read from the host; its
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| 62 | content (including checksum) is computed from the data in dscr.a51 as well.
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| 63 |
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| 64 | The WAKEUP pin should be high for the re-numeration to work reliably (thanks
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| 65 | Jean/fpga4fun!).
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| 66 |
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| 67 |
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| 68 | == Using it with Xilinx JTAG cable ==
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| 69 |
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| 70 | There is code to support running in the "Xilinx Platform Cable USB". If you
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| 71 | select HARDWARE=hw_xpcu_i or hw_xpcu_x at the top of the Makefile, a firmware
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| 72 | for the XPCU will be built. I've tested this only with unmodified CPLD version
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| 73 | 18 (0x12) on a Spartan-3E starter kit, as it was programmed by my WebPack 8.2i.
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| 74 | The code needs optimization; yet it is merely a proof of concept.
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| 75 | Compile for the XPCU with e.g. "make HARDWARE=hw_xpcu_x".
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| 76 |
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| 77 | hw_xpcu_i: Access "internal" chain (the XPCU CPLD, IC3, itself)
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| 78 | hw_xpcu_x: Access "external" chain (the Spartan 3E, PROM, etc.)
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| 79 |
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| 80 |
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| 81 | == History ==
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| 82 |
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| 83 | Changes since previous release on 2007-02-15:
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| 84 | - Jean Nicolle contributed hw_saxo_l.c for the FX2 boards from fpga4fun.com
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| 85 | - fx2/Makefile fixed to build correct libfx2.lib even under Windows.
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| 86 |
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| 87 | Changes since previous release on 2007-01-28:
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| 88 | - Initial suppport for running on Xilinx XPCU.
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| 89 | - New FX2 code, based on USRP2 from the GNU Radio Project;
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| 90 | - Firmware can now be compiled using SDCC 2.6. No more Keil support.
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| 91 | - EEPROM content is automatically computed from dscr.a51, including checksum.
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| 92 |
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| 93 | Changes since initial release on 2006-04-23:
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| 94 | - added this readme.txt
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| 95 | - reorganized my project folder: diff now created from Subversion repository
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| 96 | - stripped *.dist extension from eeprom.c and dscr.a51
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| 97 | - added unique proper product and vendor ID (thanks to Antti Lukats!)
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| 98 | - fixed checksum in eeprom.c
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| 99 | - added comments about AS/PS mode pins in usbjtag.c
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| 100 |
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| 101 |
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| 102 |
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| 103 |
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