IR_CAPTURE fail on Virtex2

[Clark Pope]

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";

 

[Neil Glenn Jacobson]

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


Clark Pope wrote:

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";

 

[Clark Pope]

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

"Neil Glenn Jacobson" <n.e.i.l.j.a.c.o.b.s.o.n@x.i.l.i.n.x.c.o.m.> wrote in
message news:ca7egf$mou1@cliff.xsj.xilinx.com...

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


Clark Pope wrote:
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";