Re: [Xc3sprog-users] xc3sprog didn't find a device in the multiple devices chain

[<bo...@el...>]

>>>>> "Luis" == Luis Alberto Guanuco <gua...@gm...> writes:

    Luis> Hi All, I have a S3Board (by Digilent)[0]. The board has a FPGA
    Luis> (XC3S200) and a PROM (XCF02S). This devices are connected a JTAG
    Luis> chain (JTAG[TDI]
    --> FPGA --> PROM --> JTAG[TDO]).

    Luis> I use the OOCDLink-s[1] board which is a FT2232D based JTAG
    Luis> interface.

    Luis> The problem is when I run xc3sprog it didn't find the
    Luis> FPGA(0x01414093). It found only the PROM(0x01414093) memory. In
    Luis> fact, xc3sprog detect other unknown device but sure it's wrong
    Luis> value.

    Luis> /home/luis/sourceforge/xc3sprog-code/build luis@luis-laptop:build$
    Luis> ./xc3sprog -c ftdi XC3SPROG (c) 2004-2011 xc3sprog project $Rev:
    Luis> 747 $ OS: Linux ...  Using Libftdi, Probably a broken Atmel device
    Luis> in your chain!  No succeeding device can be identified Cannot find
    Luis> device having IDCODE=f7fffff Revision P JTAG loc.: 0 IDCODE:
    Luis> 0xff7fffff not found in 'built-in device list'.  JTAG loc.: 1
    Luis> IDCODE: 0x01414093 Desc: XCF02S Rev: A IR length: 8


    Luis> I probed to connect the JTAG chain with the Cable USB II (Xilinx)
    Luis> and it works! (I can program the FPGA and PROM with the iMPACT
    Luis> software).

    Luis> I used xc3sprog with a CPLD (XC9572XL) and I didn't have any
    Luis> problem in detected it. But I don't know how solved the problem
    Luis> with multiple devices.

    Luis> luis@luis-laptop:build$ ./xc3sprog -c ftdi XC3SPROG (c) 2004-2011
    Luis> xc3sprog project $Rev: 747 $ OS: Linux ...  Using Libftdi, JTAG
    Luis> loc.: 0 IDCODE: 0x59604093 Desc: XC9572XL Rev: E IR length: 8

    Luis> Anybody used xc3sprog with a multiple Xilinx devices
    Luis> (FPGA,PROM,CPLD)?

Yes, I do.
Problems like yours are often chain integrity problems
- excessive ringing on cables giving ghost impulses
- to few ground connections between dongle and target
- JTAG speed to high
- bad or unsoldered pins or shorts/open with some JTAG pins

Please look carefully for these problems. What command line did you use?

Bye
-- 
Uwe Bonnes                bo...@el...

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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