MAC Interface Modes - 2.1 English

Versal ACAP 600G Channelized Multirate Ethernet Subsystem (DCMAC) LogiCORE IP Product Guide (PG369)

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2.1 English

The DCMAC Subsystem features a MAC interface (MAC I/F) which permits the user logic to bypass the PHY logic and directly access the internal hardened time-sliced MAC resources of the DCMAC Subsystem.

The MAC I/F can be used only when the DCMAC Subsystem is configured in Independent MAC and PCS+FEC mode. This mode is selected using the control field ctl_tx_independent_tsmac_and_phy_mode of the GLOBAL_MODE register. This field is configured statically when there is no data flowing through the DCMAC Subsystem.

The MAC I/F provides up to 600 Gb/s of bandwidth. You might choose to scale the clock frequency to meet the requirements of a given application. Some representative examples are shown in the following table.

Table 1. MAC I/F Bandwidth Scaling Example
MAC I/F Bandwidth MAC I/F Clock Frequency (MHz)
200 Gb/s 130.208
300 Gb/s 195.313
400 Gb/s 260.417
600 Gb/s 390.625