For each device, there are fives pins used for
fiber communication. However, as best practice, make sure that the PHY is bootstrapped into
the respective modes for fiber operation.
Table 1-1 DP83822 Fiber Pins
| Pin Name (Number) |
Functionality |
| TD_P (12) |
Transmitting Pins. Output
of the PHY. |
| TD_M (11) |
| RD_P (10) |
Receiving Pins. Input of
the PHY. |
| RD_M (9) |
| LED_1/GPIO1 (24) |
Signal Detect. Typically connected to
SFP module which helps determine if communication has been interrupted and relays to
PHY to drop link. Use other LED pins for appropriate functionalities |
Table 1-2 DP83822 Fiber Bootstrapping
| Pin Name (Number) |
Strap Mode |
Description |
| COL (29) |
2 or 3 |
Enables FX_EN |
| LED_0 (17) |
1 |
Half Duplex |
| 4 (Default) |
Full Duplex |
| RX_ER (28) |
3 or 4 (Default) |
Signal Detect Enable |
Table 1-3 DP83869 Fiber Pins
| Pin Name (Number) |
Functionality |
| SOP (15) |
Transmitting Pins. Output
of the PHY. |
| SON (14) |
| SIP (16) |
Receiving Pins. Input of
the PHY. |
| SIN (17) |
| JTAG_TDI/SD (24) |
Signal Detect. Typically connected to
SFP module which helps determine if communication has been interrupted and relays to
PHY to drop link. |
Table 1-4 DP83869 Fiber Bootstrapping
| Pin Name (Number) |
Strap Name |
OPMODE[2] |
OPMODE[1] |
OPMODE[0] |
Functional Mode |
| RX_D2 (35) |
OPMODE[2] |
0 |
0 |
1 |
RGMII to 1000BASE-X |
| RX_D3 (36) |
OPMODE[1] |
0 |
1 |
0 |
RGMII to 100BASE-FX |
| JTAG_TDO/GPIO_1
(22) |
OPMODE[0] |
1 |
0 |
0 |
Media Convertor (1000BASE-T to
1000BASE-X): 1000Mbps |
| 1 |
0 |
1 |
Media Convertor (100BASE-Tx to
100BASE-Fx): 100Mbps |