IBM PowerPC 405GP User Manual

The control logic sub-block implements the following functions:
• OPB slave device
• MAL slave device
• FIFO management logic
•
Ethernet address and pause packet match logic
•
Register file for FIFOs and Ethernet MAC handler management
• Logic for support of WOL technology
The Ethernet MAC
sUb-block implements the following functions:
• Transmit MAC Handler (TXMAC)
• Receive MAC Handler (RXMAC)
• Mil management function unit (STA)
These functions are described in the following sections.
19.2.1 MAL Slave Logic
The MAL slave (MALS) logic controls MAL transactions. MALS transfers TX and RX data between
MAL and the OPB on one side, and the EMAC FIFO handlers on the other side. MALS is a dedicated
MAL slave.
19.2.2 OPB Slave Logic
The OPB slave (OPBS) logic controls all OPB transactions between the processor core and the
EMAC configuration and status registers.
19.2.3 Ethernet Address Match Logic
Address match logic checks the destination address of received packets against a set of predefined
addresses specified by the current address filtering mode. EMAC contains one unicast (individual
address) register, two hash
tables for filtering individual and group address, and logic for detecting
broadcast address
(all ones). EMAC supports promiscuous mode and multicast promiscuous mode.
This
logic also checks the destination address of the incoming packet against a special multicast
address used for control (pause) packet recognition.
All checks for address matching are performed only after the entire destination address field is
received (except for promiscuous and
multicast promiscuous modes).
19.2.4 Configuration and Status Registers
Configuration and status registers define the EMAC configuration and reflect error/status of recent
transmitted
or received packets.
19.2.5 Wake On LAN Logic
EMAC supports Wake On LAN (WOL) technology, an industry standard in the Wired for Management
(WFM)
specification. This technology allows a sleeping or powered-off network node to be awakened
with a
special packet called a Magic Packet. In the 405GP, with WOL mode enabled, the EMAC
19-4 PPC405GP User's Manual Preliminary

IBM PowerPC 405GP Specifications

General

Brand	IBM
Model	PowerPC 405GP
Category	Computer Hardware
Language	English