General Purpose Serial Interface

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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. ... ... ...

See also[edit]