Digi International NS7520 Manual

A SERVICE OF

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Ethernet front-end (EFE)

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NS7520 Hardware Reference, Rev. D 03/2006

Ethernet front-end (EFE)

Figure 21 shows a high-level block diagram of the EFE module. The EFE module

provides the FIFO handling interface between the NS7520 BBus and MAC modules.

Figure 21: Ethernet front-end module

Basic features in the EFE include:

 Control and status registers for MAC, transmitter, and receiver

 512-byte transmit FIFO

 2048-byte local receive FIFO

 DMA interface logic

512

byte

local

Transmit

FIFO

RX

filtering &

statistics

2K

byte

Local

Receive

FIFO

MAC TX interface

MAC RX interface

BBus