DS80PCI402: Using DS80PCI402 with active optical cables

Bob Guthrie

Part Number: DS80PCI402

We are using a Broadcom 8733 on a host interface card which connects to a card which has a DS80PCI402 redriver on it. The other side of the redriver connects to RAID card at PCIe3 rate. The interconnecting cable is a Amphenol fiber optic cable. The two boards operate with copper cables between them but not with optical cable. The 8733 board operates with fiber optic cable connected to another 8733 board. Do you have any recommendations for register modifications in the DS80PCI402 for active cable operation?

Bob Guthrie

Sr. Electrical Engineer

One Stop Systems

over 5 years ago

0 Lee Sledjeski over 5 years ago

TI__Mastermind 43795 points

Hi Bob,

With the active fiber optic cable it is going to be impossible for link training waveform information to reach thePCIe receivers. Are the BRCM devices aware they are working over an active cable?

I would try to reduce the EQ gain in the DS80PCI402 inputs and DEM = 0 dB on the outputs. Does the system work at Gen1 or Gen2?

Do you have a picture of the whole system?

Regards,

Lee