Reason for the CRC_A extra timing

Gene_Milligan at notes.seagate.com Gene_Milligan at notes.seagate.com
Fri May 28 11:27:44 PDT 1999


* From the T10 Reflector (t10 at symbios.com), posted by:
* Gene_Milligan at notes.seagate.com
*
<<With data signals, the actual assertion period must be larger than
the data hold plus setup, since the "minimum assertion period" is
larger than that.With data signals, the actual assertion period must be
larger than the data hold plus setup, since the "minimum assertion period"
is larger than that.>>

     Be careful. Your reasoning and conclusion may be correct but the
citation is not correct. In SPI the assertion period specification applies
to REQ and ACK but is not applicable to data and parity signals. Only
setup, hold, and risetime specifications apply to those signals.

Gene


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