When the TX and RX power control signals are used in non-PCI Express implementations, CH*_TXPD and CH*_RXPD can be used independently. Also, when these interfaces are used in non-PCI Express applications, 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.
- CH*_TXDETECTRX must be tied Low.
- CH*_TXELECIDLE must be tied to CH*_TXPD[1] and CH*_TXPD[0].
| CH*_TXPD[1:0] or CH*_RXPD[1:0] | Description |
|---|---|
00
|
Normal mode. Transceiver TX or RX is actively sending or receiving data. |
11
|
Power-down mode. Transceiver TX or RX is idle. |
Power savings can be achieved by setting the CH*_TXPD and CH*_RXPD
ports to 2'b11, and setting TX_CLKMUX_EN and
ILO_CLKMUX_EN to 1'b0.