Seagate Ultra 320, Ultra 160 manual De-skewed data valid window, Flow control receive hold time

2.5.12De-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.

2.5.13Flow 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.

2.5.14Flow 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.

2.5.15Flow 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.

2.5.16Flow 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.

2.5.17pCRC 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.

2.5.18pCRC 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.

2.5.19pCRC 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.

2.5.20pCRC 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.

28 Parallel SCSI Interface Product Manual, Rev. A )