TX and RX power control signals can be used independently through CH*_TXPD and CH*_RXPD. Only two power states are supported, as shown in the following table. When using this power-down mechanism, these must be true:
- CH*_TXPD[1] and CH*_TXPD[0] are connected together.
- CH*_RXPD[1] and CH*_RXPD[0] are connected together.
For half density mode, the channels with unused PMA must be powered down (TX/RXPD[1:0] = 2'b11) to conform with the values from the Power Design Manager (PDM) tool (download at www.amd.com/power).
| CH*_TXPD[1:0] or CH*_RXPD[1:0] | Description |
|---|---|
2'b00
|
Normal mode. Transceiver TX or RX is actively sending or receiving data. |
2'b11
|
Power-down mode. Transceiver TX or RX is idle. |