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Visitor carls1551
Visitor
1,471 Views
Registered: ‎01-12-2010

Putting Virtex-5 RIO Rx Zcm into HI-Z

The PCIe specification requires that Rx common-mode impedance goes Hi-Z (Zrx-high-imp-dc) during Reset or Power-Down.

UG198 for the Virtex-5 GTX RocketIO says that it supports PCI Express, but it is unclear how to place the Rx Zcm into Hi-Z.

Is there some combination of Reset and/or Power-Down signaling that will place the Rx Zcm in/out of Hi-Z?  If not, is there some DRP combination that will accomplish this?

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