Robert,

V2/2Pro TAP state doesn't get reset with the pulsing of the PROG pin. 
Please clock in 5 '1's on TMS to ensure the TAP state is properly reset.

Regards, Wei

RobertP wrote:
> I know that for Virtex, Virtex-E, and Spartan-II devices, TAP controller 
> is held in reset state when PROG pin is low. This results that JTAG 
> chain cannot be used then.
> This was not the case for older devices (Spartan).
> Anybody knows how what's the situation in newer devices (I'm 
> particularly curious about Virtex II )?
> Thanks.
> 
> -- 
> Robert
> 

I know that for Virtex, Virtex-E, and Spartan-II devices, TAP controller 
is held in reset state when PROG pin is low. This results that JTAG 
chain cannot be used then.
This was not the case for older devices (Spartan).
Anybody knows how what's the situation in newer devices (I'm 
particularly curious about Virtex II )?
Thanks.

--
Robert