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28 Parallel SCSI Interface Product Manual, Rev. A )
2.5.12 De-skewed data valid window
The minimum difference in time allowed between the rising or falling edge of a “1010...” pattern on the DAT
BUS or DB(P1) and its clocking signal on the ACK or REQ signal as measured at their zero-crossing points
after skew compensation is applied by the receiver without allowing any error in the received data. The de-
skewed data valid window shall be equal to:
+/– [(data transfer period) – (residual skew error) – (strobe offset tolerance) – (clock jitter) – (receiver amplitude
skew) – (ship noise) – (system noise at receiver) – (receiver asymmetry)] / 2.
2.5.13 Flow control receive hold time
The maximum time required by the initiator between the assertion of the REQ signal corresponding to the last
iuCRC transfer of a SPI data streaming information unit and the changing of the P_CRCA signal.
2.5.14 Flow control receive setup time
The maximum time required by the initiator between the assertion of the P_CRCA signal and the assertion of
the REQ signal corresponding to the last iuCRC transfer of a SPI data streaming information unit. Also, the
maximum time required by the initiator between the negation of the P_CRCA signal and the assertion of the
REQ signal corresponding to any valid data transfer of a SPI L_Q information unit.
2.5.15 Flow control transmit hold time
The minimum time provided by the target between the assertion of the REQ signal corresponding to the last
iuCRC transfer of a SPI data stream information unit and the changing of the P_CRCA signal. Specified to pro
-
vide the increased P_CRCA receive setup time, subject to intersymbol interference, cable skew, and other dis-
tortions.
2.5.16 Flow control transmit setup time
The minimum time provided by the target between the assertion of the P_CRCA signal and the assertion of the
REQ signal corresponding to the last iuCRC transfer of a SPI data streaming information unit. Also, the mini
-
mum time provided by the target between the negation of the P_CRCA signal and the assertion of the REQ
signal corresponding to any valid data transfer of a SPI L_Q information unit. Specified to provide the
increased P_CRCA receive setup time, subject to intersymbol interference, cable skew, and other distortions.
2.5.17 pCRC receive hold time
The minimum time required at the receiver between the transition of the REQ signal and the transition of the
P_CRCA signal during data group transfers.
2.5.18 pCRC receive setup time
The minimum time required at the receiver between the transition of the P_CRCA signal and the transition of
the REQ signal during data group transfers. Specified to ease receiver timing requirements and ensure that
this signal, that is outside CRC protection, is received correctly.
2.5.19 pCRC transmit hold time
The minimum time provided by the transmitter between the transition of the REQ signal and the transition of
the P_CRCA signal during data group transfers.
2.5.20 pCRC transmit setup time
The minimum time provided by the transmitter between the transition of the P_CRCA signal and the transition
of the REQ signal during data group transfers. Specified to provide the increased receive setup time, subject to
intersymbol interference, cable skew, and other distortions.