V-Series Transceiver PHY IP Core User Guide

ID 683171
Date 7/26/2022
Public
Document Table of Contents

16.5.3. RX PMA Parameters

This section describes the RX PMA options you can specify.
Note: For more information about the CDR circuitry, refer to the Receiver PMA Datapath section in the Transceiver Architecture in Cyclone V Devices Cyclone V Devices.
Table 300.  RX PMA Parameters  

Parameter

Range

Description

Enable CDR dynamic reconfiguration

On/Off

When you turn this option On, you can dynamically change the data rate of the CDR circuit.

Number of CDR reference clocks

1–5

Specifies the number of reference clocks for the CDRs.

Selected CDR reference clock

0–4

Specifies the index of the selected CDR reference clock.

Selected CDR reference clock frequency

Device Dependent

Specifies the frequency of the clock input to the CDR.

PPM detector threshold

+/- 1000 PPM

Specifies the maximum PPM difference the CDR can tolerate between the input reference clock and the recovered clock.

Enable rx_pma_clkout port

On/Off

When you turn this option On, the RX parallel clock which is recovered from the serial received data is an output of the PMA.

Enable rx_is_lockedtodata port

On/Off

When you turn this option On, the rx_is_lockedtodata port is an output of the PMA.

Enable rx_is_lockedtoref port

On/Off

When you turn this option On, the rx_is_lockedtoref port is an output of the PMA.

Enable rx_set_lockedtodata and rx_set_locktoref ports

On/Off

When you turn this option On, the rx_set_lockedtdata and rx_set_lockedtoref ports are outputs of the PMA.

Enable rx_pma_bitslip_port

On/Off

When you turn this option On, the rx_pma_bitslip is an input to the core. The deserializer slips one clock edge each time this signal is asserted. You can use this feature to minimize uncertainty in the serialization process as required by protocols that require a datapath with deterministic latency such as CPRI.

Enable rx_seriallpbken port

On/Off

When you turn this option On, the rx_seriallpbken is an input to the core. When your drive a 1 on this input port, the PMA operates in serial loopback mode with TX data looped back to the RX channel.