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Problem with DP83848C Auto-Negotiation

Other Parts Discussed in Thread: DP83848C

We have an issue with the DP83848C not auto-negotiating out of reset on one board, but working perfectly on another.

We noted that the DP83848C on the working board is returning a model revision of 1, while the DP83848C on the  non-working board is returning a model revision of 0 (see below).

The only other difference between these boards (Ethernet Jack):

Working board uses MagJack SI-60062-F

Non-Working board uses: JX0011D21BNL

What is the difference between DP83848C (Model  0x5C90) and DP83848C (Model  0x5C91)?

Is  JX0011D21BNL compatible with DP83848C?

Non Working

PhyDump[0]  0x3100
PhyDump[1]  0x7849
PhyDump[2]  0x2000
PhyDump[3]  0x5C90
PhyDump[4]  0x01E1
PhyDump[5]  0x0000
PhyDump[6]  0x0005
PhyDump[7]  0x2001
PhyDump[8]  0x0000
PhyDump[9]  0x0000
PhyDump[10]  0x0000
PhyDump[11]  0x0000
PhyDump[12]  0x0000
PhyDump[13]  0x0000
PhyDump[14]  0x0000
PhyDump[15]  0x0000
PhyDump[16]  0x0000
PhyDump[17]  0x0000
PhyDump[18]  0x0000
PhyDump[19]  0x0000
PhyDump[20]  0x0000
PhyDump[21]  0x0000
PhyDump[22]  0x0100
PhyDump[23]  0x0021
PhyDump[24]  0x0000
PhyDump[25]  0x8021
PhyDump[26]  0x0904
PhyDump[27]  0x0000
PhyDump[28]  0x0000
PhyDump[29]  0x6011

Working/Non Working side by side

OK BAD
PhyDump[0]  0x3100
PhyDump[1]  0x7869  0x7849
PhyDump[2]  0x2000
PhyDump[3]  0x5C91  0x5C90
PhyDump[4]  0x01E1
PhyDump[5]  0xCDE1  0x0000
PhyDump[6]  0x000F  0x0005
PhyDump[7]  0x2801  0x2001
PhyDump[8]  0x0000
PhyDump[9]  0x0000
PhyDump[10]  0x0000
PhyDump[11]  0x0000
PhyDump[12]  0x0000
PhyDump[13]  0x0000
PhyDump[14]  0x0000
PhyDump[15]  0x0000
PhyDump[16]  0x4015  0x0000
PhyDump[17]  0x0000
PhyDump[18]  0x2C00  0x0000
PhyDump[19]  0x0000
PhyDump[20]  0x0000
PhyDump[21]  0x0000
PhyDump[22]  0x0100
PhyDump[23]  0x0021
PhyDump[24]  0x0000
PhyDump[25]  0x8021
PhyDump[26]  0x0904
PhyDump[27]  0x0000
PhyDump[28]  0x0000
PhyDump[29]  0x6011

Thanx