Remove AIP from SPI-4?
Robert.Elliott at COMPAQ.com
Tue Jun 26 06:54:35 PDT 2001
* From the T10 Reflector (t10 at t10.org), posted by:
* "Elliott, Robert" <Robert.Elliott at compaq.com>
With the industry implementing packetized protocol (information
units) in Ultra 320, I propose that we remove AIP (Asynchronous
Information Protection) from SPI-4. AIP was a temporary measure
designed for Ultra 160 devices that lacked packetized protocol
support (all of them), which protects the command and status
information under a CRC. Due to the swift introduction of
Ultra 320, AIP for Ultra 160 has not seen much use in the
industry. Once packetized protocol is implemented, it can be
used at 160 MB/sec or slower speeds, negating the need to
ever use AIP.
Removing the informative annex describing it in SPI-4 doesn't
preclude AIP from being implemented based on SPI-3.
Rob Elliott, Compaq Server Storage
Robert.Elliott at compaq.com
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