Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Bedienungsanleitung PDF herunterladen (Seite 151)

Term Definition

Frame Ethernet formatted packet. A frame consists of a start delimiter byte, a 7 byte

preamble, variable length data, 4-byte FCS, and an end delimiter byte.

IPG Inter Packet Gap. Includes the end of frame delimiter and subsequent IDLE

bytes up to, but not including the next start of frame delimiter. The protocol

requires an average gap of 12 bytes.

MAC Media Access Control. Formats a user packet stream into proper Ethernet

frames for delivery to the PCS. The MAC generates the FCS and checks and

maintains the IPG.

MII Media Independent Interface. The byte-oriented protocol used by the PCS.

Sometimes distinguished with roman numerals, XGMII (10), XLGMII (40),

CGMII (100).

Octet Byte. Note that Ethernet specifications primarily use least significant bit first

ordering which is opposite from the default behavior of most contemporary

CAD tools.

PCS Physical Coding Sublayer. Presents the underlying hardware as a byte-oriented

communication channel.

XLAUI 40 gigabit attachment unit interface. (XL is the symbol in Roman Numerals for

40). This is an electrical interface that which is based on a 4-lane interface with a

bandwidth of 10 Gbps per lane.

XLGMII 40 gigabit media independent interface. (XL is the symbol in Roman Numerals

for 40). This is the byte-oriented interface protocol that connects the PCS and

MAC.

3-106

Ethernet Glossary

UG-01172

2015.05.04

Altera Corporation

Functional Description

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Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Bedienungsanleitung Seite 151