# General-Purpose Serial Interface

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{{Short description|7 wire communications interface, used as an interface between Ethernet MAC and PHY blocks}}
{{More citations needed|date=February 2021}}

'''General-Purpose Serial Interface''',<ref>{{Cite journal|title=NASA Technical Reports Server (NTRS)|url=https://ntrs.nasa.gov/citations/19900000395|access-date=2021-01-29|journal=NASA Tech Briefs|date=August 1990 |volume=14 |issue=8 |last1=Busquets |first1=Anthony M. |last2=Gupton |first2=Lawrence E. }}</ref> also known as '''GPSI''', '''7-wire interface''', or '''7WS''', is a 7 wire communications interface. It is used as an interface between [Ethernet](/source/Ethernet) [MAC](/source/Medium_access_control) and [PHY](/source/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).

{| class="wikitable"
|+ 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. ...<!-- what? -->
| ...
| ...
|}

==See also==
* [Media-independent interface](/source/Media-independent_interface) (MII)

==References==
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{{Reflist|30em}}

{{Ethernet|state=collapsed}}

Category:Ethernet
Category:Computer hardware
Category:Input/output

{{compu-hardware-stub}}

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Adapted from the Wikipedia article [General-Purpose Serial Interface](https://en.wikipedia.org/wiki/General-Purpose_Serial_Interface) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/General-Purpose_Serial_Interface?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.