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Original question:

DP83869HM: Straps-only configuration possible in 1000 Mbps Media Converter mode with the DP83869 at all?

DP83869HM: "SERDES-to-Copper Mode" possible?

d b
Prodigy 20 points

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869,

Tool/software:

Hello,

I'm building an SFP module with the DP83869 and I'm trying to figure out if it can be done using straps only.

The DP83869 needs to be configured as a SERDES to copper interface.

The closest description to that setup seems to be Figure 8, "SGMII-to-Copper Mode" on page 10 of SNLA318, however of course the SGMII side would need to be fixed 1000Mbps FD, no auto-negotiation.

Looking at Table 16, "Strap Functional Table for Copper Interface" on the same page seems to indicate that a Forced 1000M, full duplex mode is not available.

So am I correct in understanding that this configuration is not achievable through straps only? Can it be achieved by software? On page 37 of SNLS614D it's stated that "The SGMII Auto-Negotiation process can be disabled and the SGMII speed mode can be forced to the MDI resolved speed. The SGMII forced speed mode can be enabled with the MDI auto-negotiation or MDI manual speed mode. SGMII Auto-Negotiation can be disabled through the SGMII_AUTONEG_EN register bit in the CFG2 register (address 14h)." Would that be enough?

Out of curiosity, would the media converter mode (1000Base-T to 1000Base-X) work in this situation? The linked thread seems to indicate it would, but I have a DP83869 configured like that and while the link is up at 1000M, there's no traffic. The computer reports it's "connected", but with a "self-assigned IP". Would this be an alternative configuration that can be made to work?

Thanks,