How to use the 8LEDs on DIO4 when connected to Virtex 2 Pro kit?

Hello,

I am trying to implement an 8 bit adder program using VHDL on Virtex 2
pro with expansion kit DIO4 from digilent.

The code is correct and I can see the result on 4 LEDs of Virtex 2 pro
kit from Digilent. But when trying with LEDs on DIO4 kit, I could not
see any result. I gave the direct pin connections both for switches
and LEDs. The switches are working fine but not the LEDs. In the
reference manual,  I observed that there is latch between LEDs and
connector P1. But I dont know how to use latch for this program.

Can any one guide me how to solve this problem?

http://www.digilentinc.com/Data/Products/DIO4/DIO4_rm.pdf. This is the
reference manual for DIO4 kit.

Thanks in advance.

Krishna

Krishna wrote:

> and LEDs. The switches are working fine but not the LEDs. In the
> reference manual,  I observed that there is latch between LEDs and
> connector P1. 

See page 4
"If the system bus is not needed, then the LDG signal
can be tied high."