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problem with REQ# signal



Hi experts,
 
I am working with a PCI master card and trying to do some PCI transaction with out putting a Bus arbiter. I have asserted the GNT# pin with a pull down. While trying for a PCI transfer, the REQ# pin is going low and not coming to a high state. Other bus signals are also not showing any activities.
 
please help
 
regards
Din