GT Quad Transceiver Clocking Modes - 1.3 English

Versal Devices Integrated 100G Multirate Ethernet MAC Subsystem Product Guide (PG314)

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1.3 English

The GT Quad Operating Modes table lists the supported MRMAC GT Quad interface clock frequency for each operating mode. All GT Quad lane interfaces for a port operating in a multi-lane operating modes have the same configuration. The ctl_serdes_width[2] bit selects the GT Quad interface to operate in narrow interface width or wider x2 GT Quad interface width.

The following table shows a list of MRMAC-supported interface options for FEC-only mode, including the associated data rates, datapath width, and clock frequency.

Table 1. Transceiver FEC-Only Operating Modes
Operating Mode RS (528,514) RS (544,514) FEC-Only Rate (Gb/s) FEC-Only Interface Data Width (Bits) FEC-Only Interface Clock (MHz) FEC-Only Logic Internal Clock (MHz)
25.78125 FEC-only 25.78125 80 322.2556 644.5313
51.5625G FEC-only 51.5625 160 322.2556 644.5313
53.125G FEC-only 53.125 160 322.0312 644.0625
56.42G FEC-only 56.42 160 352.625 705.25
103.125 FEC-only 103.125 320 322.2556 644.5313
106.125G FEC-only 106.25 320 332.0312 664.0625
112.84G FEC-only 112.84 320 352.625 705.25

When configured in x2 width mode, the GT Quad interface from the lane is clocked by rx_alt_serdes_clk[n] and tx_alt_serdes_clk[n]. The rx_serdes_clk[n] connects to a GT Quad transceiver generated clock whose frequency is x2 rx_alt_serdes_clk[n]. The tx_core_clk[m] is driven by the GT Quad generated x2 tx_alt_serdes_clk[n] clock (where n is the lane number and m is the port number).

A full pin description of the GT Quad interface is provided in the later Transceiver Interface section and the GT interface clocking examples are in the Clocking Use Cases section.