Arria® V Device Handbook: Volume 2: Transceivers

ID 683573
Date 5/29/2020
Document Table of Contents

6.6.4. 10G PCS Configurations

The Low Latency PHY IP can also configure 10G PCS in the low latency datapath.

To implement a Low Latency PHY link with the 10G PCS, instantiate the Low Latency PHY IP in the IP Catalog, under Transceiver PHY in the Interfaces menu. In the Low Latency GUI under the General tab, select 10G on the Datapath type field.

A Low Latency PHY IP core with the 10G PCS is available for 32-bit, 40-bit, 50-bit, 64-bit, or 66-bit PCS data width configurations.

Figure 215. 10G PCS Low Latency Configuration Datapath

Figure 216. Options for 10G PCS Low Latency ConfigurationThe blocks shown as “Disabled” are not used but incur latency. The blocks shown as “Bypassed” are not used and do not incur any latency. The FPGA fabric-to-transceiver interface maximum frequency is for the fastest speed grade devices.

The Quartus II software supports both non-bonded configuration and bonded configurations up to 32 lanes in the link when the 10G PCS in low latency datapath configuration is enabled. If you create multiple non-bonded channels with the 10G PCS in low latency mode, a common parallel clock (used in the bonded lane or channel configuration) is not generated by the central clock divider block. Each transmitter channel takes the high-speed clock, generated by the channel PLL, and locally divides it to generate the parallel clock.