Clocking Use Cases - 2.1 English

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

Document ID
PG314
Release Date
2023-07-11
Version
2.1 English

This appendix illustrates the clocking strategy for various modes of MRMAC operation.

Emphasis is placed on showing how one mode can dynamically evolve into another. For example, the MRMAC might start off configured as 4 × 10G clients but then dynamically re-configure into a 1 × 50G + 10G + 25G configuration.

Table 1. Clocking Use Cases Index
Example Configuration
Standard Ethernet MAC + PCS (Low Latency Mode) End Point
1a 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Low Latency AXI Operating Mode
1b 1 × 50GE (1 × 53.12 Gb/s), 2 × 10/25GE 2 × 10.31/25.78 Gb/s) Low Latency Operating Mode (50GE IEEE 802.3cd )
1c 1 × 50GE (2 × 26.56 Gb/s), 2 × 10/25GE 2 × 10.31/25.78 Gb/s) Low Latency Operating Mode (50GE IEEE 802.3cd External Gearbox)
1d 1 × 100GE (4 × 25.78/26.56 Gb/s) Operating Mode
Standard Ethernet MAC + PCS (Low Frequency AXI4-Stream) End Point
2a 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Low Speed AXI Operating Mode
2b 1 × 50GE (1 × 53.12 Gb/s), 2 × 10/25GE 2 × 10.31/25.78 Gb/s) Low Speed AXI Operating Mode (50GE IEEE 802.3cd )
2c 1 × 50GE (2 × 26.56 Gb/s), 2 × 10/25GE 2 × 10.31/25.78 Gb/s) Low Speed AXI Operating Mode (50GE IEEE 802.3cd External Gearbox)
2d 1 × 100GE (4 × 25.78/26.56 Gb/s) Low Speed AXI Operating Mode
2e 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Low Speed AXI opt2 Operating Mode
2f 1 × 50GE (1 × 53.12 Gb/s), 2 × 10/25GE 2 × 10.31/25.78 Gb/s) Low Speed AXI Operating Mode (50GE IEEE 802.3cd )
2g 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Independent Lanes, Low Speed AXI opt2 Operating Mode
2h 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Independent Clock Lanes, Low Speed AXI Operating Mode
2i 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) Low Speed PCS Data (-1LP), Low Speed AXI Operating Mode
2j 1 × 100GE (4 × 28.21 Gb/s) Overclock, Low Speed AXI Operating Mode
2k 1 × 100GE (2 × 56.42 Gb/s) Overclock, Low Speed AXI Operating Mode
PCS Only and FEC Only End Point Use Cases
3a 4 × 10/25GE (4 × 10.3125/4 × 25.78 Gb/s) PCS Only, Low Speed AXI Operating Mode
3b 4 × 28.21GE FEC Only, Operating Mode