PROG_B and JTAG

Hi,
I'll not use PROG_B with my Spartan3, should I just pull-it up with
10k?
Is it true that I can alway access the FPGA through the JTAG port even
if the M0-M2 are hardware-set for slave/master serial? 
Thanks, Marco

"Marco" <marco@marylon.com> schrieb im Newsbeitrag 
news:1144999372.724233.229220@u72g2000cwu.googlegroups.com...
> Hi,
> I'll not use PROG_B with my Spartan3, should I just pull-it up with
> 10k?
> Is it true that I can alway access the FPGA through the JTAG port even
> if the M0-M2 are hardware-set for slave/master serial?
> Thanks, Marco
>
yes m0,m1,m2 are dont cared for JTAG but PROG_B *must* be high or jtag 
config will fail, there I think it supposed to be internal pullup on prog_b 
but at least with xilinx virtex I have seen that external pullup is also 
required, so better have it in place

antti