Three types of delays exist within an X5IO PHY. All delay adjustments must be done through the APB3 interface.
Note: A tap is the smallest amount of delay that a delay line
can produce.
- Input delays: Input delays can delay incoming serialized data up to 512 taps (0–511 taps). The same delay can be configured as quarter delays.
- Output delays: Output delays can delay outgoing serialized data up to 512 taps (0–511 taps).
- Quarter (QTR) delays: QTR delays are applied to the p-clk and n-clk. QTR delays can be used up to 512 taps (0–511 taps).
For more information on the p-clk and n-clk, see Clocking.