Digi NS9750 - Manual (Page 340)

O v e r v i e w
3 1 6 N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Overview
The Ethernet MAC module provides the following:
Station address logic (SAL)
Statistics module
Interface to MII (Media Independent Interface) PHY
Interface to RMII (Reduced Media Independent Interface) PHY
The Ethernet front-end module does the following:
Provides control functions to the MAC
Buffers and filters the frames received from the MAC
Pumps transmit data into the MAC
Moves frames between the MAC and the system memory
Reports transmit and receive status to the host
“Legend”
RX_RD
= Receive read
RX_WR
= Receive write
TX_RD
= Transmit read
TX_WR
= Transmit write
Figure 63 shows the Ethernet Communications module.