Digi NS7520 Benutzerhandbuch
E t h e r n e t f r o n t - e n d ( E F E )
1 5 0
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v . D 0 3 / 2 0 0 6
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.
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