I am trying to get an xc3s250e-4tq144c to configure using JTAG.
- impact reads 0x00000000 as idcode This causes impact to error out during identify with a strange error about missing bsdl's
- JTAG works using impact debug mode. I can put it in bypass and also see the length of the instruction register. I can see data shifting in and out so I know JTAG works.
- Part markings are: XC3250E TQ144AGQ0601 D1392255A0
- I have tried impact 8.1.3 and 9.1
- I get identical results with two pc boards.
- Same software / computer / cable setup works fine with a virtex2p design.
- All power supplies look good. (1.2Vint, 2.5Vaux, 3.3Vio)
- spartan-3e is the only part in the JTAG chain.
I have tried removing all the parts except the spartan and power to make sure nothing else was interfering with it.
I have not made any progress with my Avnet FAE and Xilinx webcase so I thought to try here.
I have run out of things to try. Does this look familiar to anyone? Any ideas to try?
Alan Nishioka snipped-for-privacy@nishioka.com