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AR# 30095

Virtex-4 FX40 - Incorrect IDCODE in BSDL files of XC4VFX40

Description

When I initialize a JTAG chain that contains a Virtex-4 FX40 device, I receive an error like this:

"ERROR:iMPACT:583 - '<position number>': The idcode read from the device does not match the idcode in the bsdl File.

INFO:iMPACT:1578 - '<position number>': Device IDCODE : XXXX0001111010001100000010010011

INFO:iMPACT:1579 - '<position number>': Expected IDCODE: XXXX0001111010010100000010010011

i.e., the expected IDCODE is X1E94093(HEX), but the read back IDCODE is X1E8C093 (HEX)."

Solution

The expected IDCODE comes from the BSDL files.

But the BSDL files of FX40 have incorrect IDCODE.

The correct IDCODE should be XXXX0001111010001100000010010011, or X1E8C093 in HEX.

Open the xc4vfx40.bsd file with a text editor, replace below statement

"010010100" & -- array size

with

"010001100" & -- array size

If other .bsd files, such as xc4vfx40_ff1152.bsd, are needed, you should modify them in this way as well.

The latest BSDL files on the Download Center have the updated BSDL files with the correct IDCODE.

AR# 30095
Date Created 06/03/2008
Last Updated 12/15/2012
Status Active
Type General Article