General Purpose Serial Interface

General Purpose Serial Interface, also known as GPSI, 7-wire interface, or 7WS, is a 7 wire communications interface. It is used as an interface between Ethernet MAC and PHY blocks.

Data is received and transmitted using separate data paths (TXD, RXD) and separate data clocks (TXCLK, RXCLK). Other signals consist of transmit enable (TXEN), receive carrier sense (CRS), and collision (COL).

GPSI Signals
Signal Name	Direction	Description
TXD	MAC > PHY	Transmit Data (driven on rising edge of TXCLK)
TXEN	MAC > PHY	Transmit Data Enable (indicates valid TXD)
... etc ...	...	...

Ethernet family of local area network technologies

Speeds	10 Mbit/s 10BASE2 10BASE-T 100 Mbit/s 1 Gbit/s 2.5 and 5 Gbit/s 10 Gbit/s 25 and 50 Gbit/s 40 and 100 Gbit/s 400 Gbit/s and 1 Tbit/s

General	IEEE 802.3 Physical layer Autonegotiation Power over Ethernet EtherType Ethernet Alliance Flow control Frames Jumbos

Historic	CSMA/CD StarLAN 10BROAD36 10BASE-FB 10BASE-FL 10BASE5 100BaseVG LattisNet Long Reach

Applications	Industrial Carrier Audio First mile 10G-EPON Data center Energy Efficiency Synchronous Power over Ethernet

Transceivers	MAU GBIC SFP XENPAK XFP SFP+ QSFP CFP

Interfaces	AUI MDI MII GMII XGMII XAUI

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General Purpose Serial Interface

See also