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Spartan-3 : preconfiguration pull-up/float ?

Started by Amontec Team September 15, 2003
Hi,

For the Spartan-II, the preconfiguration pullup resistors were selected 
by the M2 configuration pin. What about for the Spartan-3?

My new design has to connect an ARM7TDMI bus to the SPARTAN-3. I need to 
make sure my ucLinux will boot correctly, and so make sure about the IO 
pins states of the SPARTAN-3 on the poweron.

Regards,
Laurent

Like Virtex-II and Virtex-II Pro, the Spartan-3 FPGA pre-configuration
pull-up resistors are controlled by the HSWAP_EN pin.

0 = Enables weak pull-up resistors on all pins not actively involved in the
configuration process.

1 = No pull-up resistors during configuration.

After configuration, this pin is not used and should be kept at a logic 0 or
1.

See page 13 of the Spartan-3 data sheet (Module 4, Pinouts) for more
information.
http://direct.xilinx.com/bvdocs/publications/ds099-4.pdf
---------------------------------
Steven K. Knapp
Applications Manager, Xilinx Inc.
Spartan-3/II/IIE FPGAs
http://www.xilinx.com/spartan3
---------------------------------
Spartan-3:  Make it Your ASIC

"Amontec Team" <laurent.gauch@www.DELALLCAPSamontec.com> wrote in message
news:3f65851f$1@news.vsnet.ch...
> Hi, > > For the Spartan-II, the preconfiguration pullup resistors were selected > by the M2 configuration pin. What about for the Spartan-3? > > My new design has to connect an ARM7TDMI bus to the SPARTAN-3. I need to > make sure my ucLinux will boot correctly, and so make sure about the IO > pins states of the SPARTAN-3 on the poweron. > > Regards, > Laurent >