IR_CAPTURE fail on Virtex2

Jun 08, 2004 2 Replies

I am able to program and scan Altera devices on my scan chain but when I go to load the Virtex2 I get an IR_Capture failure because the LSB on the Virtex is not being set. I am using a serial prom on that chip so I'm worried that it is trying to load at power up and messing up the JTAG in the chip. Anyone ever seen a problem like this?


> INFO:iMPACT:1206 - Instruction Capture =

'0101010101000000010101000101000101010101010000000110101101'


> INFO:iMPACT:1207 - Expected Capture =

'0101010101XXXX01XXXXXXXXXXXXXX010101010101XXXXXX01XXXXXX01'



'0101010101XXXX01XXXXXXXXXXXXXX010101010101XXXXXX01XXXXXX01'




> I generated the third line by reading the .bsdl
> files for what the INSTRUCTION_CAPTURE value should be. So everything
> matches except that the XC2V2000 is not setting the LSB to one. It must be
> kept in reset or something...
>
> attribute INSTRUCTION_CAPTURE of XC2V2000_FG676 :
> entity is
> -- Bit 5 is 1 when DONE is released (part of startup
> sequence)
> -- Bit 4 is 1 if house-cleaning is complete
> -- Bit 3 is ISC_Enabled
> -- Bit 2 is ISC_Done
> "XXXX01";

Do you have an external pull-up on TDO of the 2v2000? You need one.

Clark P> I am able to program and scan Altera devices on my scan chain but when I go

Yes, the TDO has to be working as I am able to program and scan the other devices on the chain.

go

the

be

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