Hello,
We are trying to establish communication between Freescale QorIQ LS1021 ETSEC Ethernet Controller and DP83867 PHY. They are connected through 4 wire SGMII interface. Unfortunately we started our design with the older version of DP83867 datasheet (OCTOBER 2015). Initial design can be seen from the attached DP83867_schematic file.
Then we made the following modifications in the circuitry according to the revised version (March 2017) of DP83867:
- RX_CTRL is modified to Mode3 to enable autonegotiation.
- LED_0 Rhi resistor value is changed from 11K to 10K to set strap configuration to Mode2.
In our tests we observed that in far end (reverse) loopback mode, we successfully received transmitted packages. Hovewer neither in MII loopback mode, nor in Digital loopback mode, we could not receive none of the transmitted messages. We have checked SGMII lines and observed 1.25GHz signals at transmit and receive lanes.
We have also set bit7 of register 0x31 to 0 and restarted autonegotiation by writing 0x1200 to register 0. But we did not observe any improvement.
Dumped DP83867 register values are given below.
Do you have any suggestions to solve SGMII autonegotiation problem?
Kind Regards,
Asil YILDIRIM
RX_D0 and RX_D2 are at Mode1, so PHY address is 0.
register 0x31 kept unchanged:
phy add 0
reg add: 0x00000000, val: 0x00001000
reg add: 0x00000001, val: 0x0000796d
reg add: 0x00000002, val: 0x00002000
reg add: 0x00000003, val: 0x0000a231
reg add: 0x00000004, val: 0x000001e1
reg add: 0x00000005, val: 0x0000c1e1
reg add: 0x00000006, val: 0x0000006d
reg add: 0x00000007, val: 0x00002001
reg add: 0x00000008, val: 0x00004806
reg add: 0x00000009, val: 0x00000300
reg add: 0x0000000a, val: 0x00003800
reg add: 0x0000000b, val: 0x00000000
reg add: 0x0000000c, val: 0x00000000
reg add: 0x0000000d, val: 0x0000401f
reg add: 0x0000000e, val: 0x00000095
reg add: 0x0000000f, val: 0x00003000
reg add: 0x00000010, val: 0x00005848
reg add: 0x00000011, val: 0x0000ae02
reg add: 0x00000012, val: 0x00000000
reg add: 0x00000013, val: 0x00000000
reg add: 0x00000014, val: 0x000029c7
reg add: 0x00000015, val: 0x00000000
reg add: 0x00000016, val: 0x00000000
reg add: 0x00000017, val: 0x00000040
reg add: 0x00000018, val: 0x00006150
reg add: 0x00000019, val: 0x00004444
reg add: 0x0000001a, val: 0x00000002
reg add: 0x0000001b, val: 0x00000000
reg add: 0x0000001c, val: 0x00000000
reg add: 0x0000001d, val: 0x00000000
reg add: 0x0000001e, val: 0x00000002
reg add: 0x0000001f, val: 0x00000000
phy add 0
reg add: 0x00000025, val: 0x00000400
reg add: 0x00000031, val: 0x000010b0
reg add: 0x00000032, val: 0x000000d3
reg add: 0x00000033, val: 0x00000000
reg add: 0x00000037, val: 0x00000001
reg add: 0x00000038, val: 0x00000000
reg add: 0x0000006e, val: 0x00000800
reg add: 0x0000006f, val: 0x00000100
reg add: 0x00000071, val: 0x00000000
reg add: 0x00000072, val: 0x00000000
reg add: 0x000000d3, val: 0x00000000
reg add: 0x000000dc, val: 0x00003800
reg add: 0x000000fe, val: 0x0000e721
reg add: 0x00000135, val: 0x00000000
reg add: 0x0000016f, val: 0x00000095
Register 0x31 bit7 is set to 0:
phy add 0
reg add: 0x00000000, val: 0x00001000
reg add: 0x00000001, val: 0x0000796d
reg add: 0x00000002, val: 0x00002000
reg add: 0x00000003, val: 0x0000a231
reg add: 0x00000004, val: 0x000001e1
reg add: 0x00000005, val: 0x0000c1e1
reg add: 0x00000006, val: 0x0000006d
reg add: 0x00000007, val: 0x00002001
reg add: 0x00000008, val: 0x00004806
reg add: 0x00000009, val: 0x00000300
reg add: 0x0000000a, val: 0x00003800
reg add: 0x0000000b, val: 0x00000000
reg add: 0x0000000c, val: 0x00000000
reg add: 0x0000000d, val: 0x0000401f
reg add: 0x0000000e, val: 0x00000095
reg add: 0x0000000f, val: 0x00003000
reg add: 0x00000010, val: 0x00005848
reg add: 0x00000011, val: 0x0000ae02
reg add: 0x00000012, val: 0x00000000
reg add: 0x00000013, val: 0x00000000
reg add: 0x00000014, val: 0x000029c7
reg add: 0x00000015, val: 0x00000000
reg add: 0x00000016, val: 0x00000000
reg add: 0x00000017, val: 0x00000040
reg add: 0x00000018, val: 0x00006150
reg add: 0x00000019, val: 0x00004444
reg add: 0x0000001a, val: 0x00000002
reg add: 0x0000001b, val: 0x00000000
reg add: 0x0000001c, val: 0x00000000
reg add: 0x0000001d, val: 0x00000000
reg add: 0x0000001e, val: 0x00000002
reg add: 0x0000001f, val: 0x00000000
phy add 0
reg add: 0x00000025, val: 0x00000400
reg add: 0x00000031, val: 0x00001030
reg add: 0x00000032, val: 0x000000d3
reg add: 0x00000033, val: 0x00000000
reg add: 0x00000037, val: 0x00000001
reg add: 0x00000038, val: 0x00000000
reg add: 0x0000006e, val: 0x00000800
reg add: 0x0000006f, val: 0x00000100
reg add: 0x00000071, val: 0x00000000
reg add: 0x00000072, val: 0x00000000
reg add: 0x000000d3, val: 0x00000000
reg add: 0x000000dc, val: 0x00003800
reg add: 0x000000fe, val: 0x0000e721
reg add: 0x00000135, val: 0x00000000
reg add: 0x0000016f, val: 0x00000095
