E-1110 Core Functional Description
2-11
Frame Reception Model – The Gigabit MAC frame reception model
complies with the IEEE 802.3 standard. The frame reception function
consists of the receive media management function and the receive data
decapsulation function.
Receive Data Decapsulation – The Gigabit MAC receive data
decapsulation function complies with the IEEE 802.3 standard. The
receive data decapsulation function consists of the address recognition
function, the frame check sequence validation function, and the frame
disassembly function.
Address Recognition – The Gigabit MAC address recognition function
complies with the IEEE 802.3 standard.
IEEE 802.3 Standard Address Recognition Requirements – The
IEEE 802.3 standard calls for a MAC Sublayer to recognize both
individual, group, and broadcast addresses. The MAC Sublayer has the
following requirements:
Recognize and accept any frame whose destination address eld
contains the individual or unicast address of the station.
Recognize and accept any frame whose destination address eld
contains the broadcast address.
Recognize and accept any frame whose destination address eld
contains an active group address.
Be capable of activating and deactivating multiple group addresses.
Gigabit MAC Address Recognition – The Gigabit MAC address
recognition function complies with the IEEE 802.3 standards. The Gigabit
MAC can provide the MAC level address recognition functions required
by the IEEE 802.3 standard.
The Gigabit MAC host receive function interface provides the required
handshaking logic signals, detailed below, to support detection and
latching of the receive frame’s destination address eld. Outputs are also
provided that indicate the destination address type. Individual, group, and
broadcast address types are supported.
The Receive Status Vector (MACRX_STATUS[41:0]) outputs provide a
vector similar to the transmit function for generation of RMON/SNMP
statistics.