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Altera_Forum
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14 years ago

PCIE link -up status

Hi , I am migrating an old design i had using a soft PCIE core to cyclone 4's hard IP. I had a 'link-up' status signal which I used to drive an LED whenever the link became active. Is there an equiva...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

The link is consider up when the 10G MAC successfully transmit or receive idle to/from the link partner. Use the 10g MAC "link_fault_status_xgmii_rx" output.

1) link_idle = 2b'00 <- after powerup, this show link idle because the system is still in reset stage.

2) link_training = 2b'01 <- after transceiver reset sequence is complete, the link is still not stable and trying to transmit the idle here.

3) link_up = 2'b00 <- the link is stable and successfully transmit/receive idle, the mac will show link up.