Digi NS9215 - Manual (Page 261)

. . . . .
E T H E R N E T C O M M U N I C A T I O N M O D U L E
www.digiembedded.com 261
Ethernet Communication Module
C H A P T E R 6
T
he Ethernet Communication module consists of an Ethernet Media Access
Controller (MAC) and Ethernet front-end module. The Ethernet MAC interfaces to an
external PHY through the industry-standard interface: Media Independent Interface
(MII). The Ethernet front-end module provides all of the control functions to the
MAC.
Features
The Ethernet MAC module provides the following:
Station address logic (SAL)
Statistics module
Interface to MII (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
Common
acronyms RX_RD = Receive read
RX_WR = Receive write
TX_RD = Transmit read
TX_WR = Transmit write