SNLS504G October 2015 – June 2026 DP83867CS , DP83867E , DP83867IS
PRODUCTION DATA
In some multiport applications, mirror RJ-45 ports relative to one another. This mirroring can require crossing board traces. The DP83867 can resolve this issue by implementing mirroring of the ports inside the device.
In 10/100 operation, the mapping of the port mirroring is:
| MDI MODE | MIRROR PORT CONFIGURATION |
|---|---|
| MDI | A → D |
| B → C | |
| MDIX | A → D |
| B → C |
In Gigabit operation, the mapping of the port mirroring is:
| MDI MODE | MIRROR PORT CONFIGURATION |
|---|---|
| MDI or MDIX | A → D |
| B → C | |
| C → B | |
| D → A |
Enable mirror mode through strap or through register configuration using the Port Mirror Enable bit in the CFG4 register (address 0x0031). In Mirror mode, the polarity of the signals is also reversed.