ZHCSEC3D October 2015 – November 2022 DP83867CS , DP83867E , DP83867IS
PRODUCTION DATA
BIT | BIT NAME | DEFAULT | DESCRIPTION |
---|---|---|---|
15:13 | RESERVED | 0, RO | RESERVED |
12:8 | CLK_O_SEL | 0 1100, RW | Clock Output Select: 01101 - 11111: RESERVED 01100: Reference clock (synchronous to XI input clock) 01011: Channel D transmit clock 01010: Channel C transmit clock 01001: Channel B transmit clock 01000: Channel A transmit clock 00111: Channel D receive clock divided by 5 00110: Channel C receive clock divided by 5 00101: Channel B receive clock divided by 5 00100: Channel A receive clock divided by 5 00011: Channel D receive clock 00010: Channel C receive clock 00001: Channel B receive clock 00000: Channel A receive clock |
7 | RESERVED | 0, RO | RESERVED |
6 | CLK_O_DISABLE | 0, RW | Clock Output Disable: 1 = Disable clock output on CLK_OUT pin. 0 = Enable clock output on CLK_OUT pin. |
5 | RESERVED | 0, RO | RESERVED |
4:0 | IO_IMPEDANCE_CTRL | TRIM, RW | Impedance Control for MAC I/Os: Output impedance approximate range from 35-70 Ω in 32 steps. Lowest being 11111 and highest being 00000. Range and Step size will vary with process. Default is set to 50 Ω by trim. But the default register value can vary by process. Non default values of MAC I/O impedance can be used based on trace impedance. Mismatch between device and trace impedance can cause voltage overshoot and undershoot. |