# SPI-3

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{{Short description|Chip-to-chip, channelized, packet interface}}
'''SPI-3''' or [System Packet Interface](/source/System_Packet_Interface) Level 3 is the name of a chip-to-chip, channelized, packet interface widely used in high-speed communications devices.  It was proposed by [PMC-Sierra](/source/PMC-Sierra) based on their [PL-3](/source/PL-3) interface to the [Optical Internetworking Forum](/source/Optical_Internetworking_Forum) and adopted in June 2000.  PL-3 was developed by PMC-Sierra in conjunction with the [SATURN Development Group](/source/SATURN_Development_Group).

==Applications==
It was designed to be used in systems that support [OC-48](/source/OC-48) [SONET](/source/SONET) interfaces .  A typical application of SPI-3 is to connect a framer device to a network processor.  It has been widely adopted by the high speed networking marketplace.

==Technical details==
The interface consists of (per direction):
* 32 TTL signals for the data path
* 8 TTL signals for control
* one TTL signal for clock
* 8 TTL signals for optional additional multi-channel status

There are several clocking options.  The interface operates around 100 MHz.  Implementations of SPI-3 (PL-3) have been produced which allow somewhat higher clock rates.  This is important when overhead bytes are added to incoming packets.

==SPI-3 in the marketplace==
SPI-3 (and [PL-3](/source/PL-3)) was a highly successful interface with many semiconductor devices produced to it.

==See also==
* [System Packet Interface](/source/System_Packet_Interface)
* [SPI-4.2](/source/SPI-4.2)

==External links==
* [http://www.oiforum.com/public/impagreements.html  OIF Interoperability Agreements] {{Webarchive|url=https://web.archive.org/web/20051025083456/http://www.oiforum.com/public/impagreements.html |date=2005-10-25 }}

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Category:Network protocols

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Adapted from the Wikipedia article [SPI-3](https://en.wikipedia.org/wiki/SPI-3) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/SPI-3?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.