Other Parts Discussed in Thread: DP83869, , DP83869EVM
Simply stated, it does not work. Although I have recently brought up a RGMII to Cu implementation using the DP83869 (same device) which does work.
The DP83869 is interfaced to a SJA1105S using SGMII. Simple test data makes it as far as the SJA1105S's port 4, or so the counters say.
The DSP83869 has PhyAddr 0, and is strapped for OpMode210 = 110 (CPLD pulls thro 2k49), Aneg = 000, MirrorEn = 0 and LinkLoss = 'Z'
Both devices can be accessed to poke control and dump status registers using SMI / SPI. Equally both devices have 25MHz clocks, observable as ClkOut.
One, minor, specific question is does the DP83869 have sgmii polarity reversal controls, the SJA1105 does and these have been set to normal for both Tx and Rx.
The core question is having exhausted the UM and ANs for ways ahead does one set to work the DP83869 ?
I gathered from a forum post that there are surprises undocumented in the manual, e.g. if one side wont talk the other keeps mum as well; deadly embrace ?
My last effort was to set the MAC loopback bit in register 0xC00 and look for returned traffic in the SJA1105, nothing seen.
The RJ45 interface is connected to a dumb switch (NetGear GS105) for test - auto negotiation does not succeed (based on the GS105s lites) [cable and GS105 pre checked].
As mentioned earlier the key questions are:
- what to check / tweak configuration wise
- what status indications to check
- which test modes and what settingsto use to prove the two external interfaces
Standing by
Martin
