SNLS614A September 2018 – December 2018 DP83869HM
PRODUCTION DATA.
In some applications, the orientation of the cable connector can require Copper PMD traces to cross over each other. This complicates the board layout. The DP83869HM can resolve this issue by implementing mirroring of the ports inside the device.
In 10/100 operation, the mapping of the port mirroring is shown in Table 5. When using mirror mode in 100-Mbps mode, TI recommends that the user read register 0xA1 and write the same value in register 0xA0.
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 shown in Table 6.
MDI MODE | MIRROR PORT CONFIGURATION |
---|---|
MDI or MDIX | A → D |
B → C | |
C → B | |
D → A |
Mirror mode can be enabled 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.