Seagate Ultra 320 Receive internal hold time, Receive internal setup time, Receive setup time

DB(P1) signals. For paced data transfers negative values as measured at the device connector are accommo- dated by skew compensation in the receiver. Receive hold time measured at the device connector shall not exceed the skew correction range.

2.5.32Receive internal hold time

The minimum time provided for hold time in the receive data detector after allowance for timing errors and tim- ing compensation from all sources measured from the worst-case bit (i.e., data or parity) to the compensated offset strobe.

Note. This time may not be observable to other than the SCSI device designer.

2.5.33Receive internal setup time

The minimum time provided for setup time in the receive data detector after allowance for timing errors and timing compensation from all sources measured from the worst-case bit (i.e., data or parity) to the compen- sated offset strobe.

Note. This time may not be observable to other than the SCSI device designer.

2.5.34Receive negation period

The minimum time required at a SCSI device receiving a REQ signal for the signal to be negated while using synchronous transfers or paced transfers. Also, the minimum time required at a SCSI device receiving an ACK signal for the signal to be asserted while using synchronous transfers or paced transfers. For SE Fast-5 and Fast-10 operation, the time period is measured at the 2,0 V level. For SE Fast-20 operation the period is mea- sured at the 1,9 V level. For LVD, see SPI-5 Section 9, for signal measurement points.

2.5.35Receive setup time

For ST data transfers, the minimum time required at the receiving SCSI device between the changing of Data Bus, DB(P_CRCA), and/or DB(P1) signals and the assertion of the REQ signal or the ACK signal while using synchronous data transfers. For DT data transfers, the minimum time required at the receiving SCSI device between the changing of Data Bus, DB(P_CRCA), and/or DB(P1) signals and the transition of the REQ signal or the ACK signal. For paced data transfers negative values as measured at the device connector are accom- modated by skew compensation in the receiver. Receive setup time measured at the device connector shall not exceed the skew correction range.

2.5.36Receive REQ(ACK) period tolerance

The minimum tolerance that a SCSI device shall allow to be subtracted from the REQ(ACK) period. The toler- ance comprises the transmit REQ(ACK) tolerance plus a measurement error due to noise.

2.5.37Receive REQ assertion period with P_CRCA transitioning

The minimum time required at a SCSI device receiving a REQ signal for the signal to be asserted while P_CRCA is transitioning during data group transfers. Specified to ensure that the assertion period is longer than the receive hold time plus the receive setup time.

2.5.38Receive REQ negation period with P_CRCA transitioning

The minimum time required at a SCSI device receiving a REQ signal for the signal to be negated while P_CRCA is transitioning during data group transfers. Specified to ensure that the negation period is longer than the receive hold time plus the receive setup time.

2.5.39Receive skew compensation

The effective reduction in worst-case timing skew of data, parity, and strobe signals provided by the receiving SCSI device but not directly observable at the receiving SCSI device connector.

30 Parallel SCSI Interface Product Manual, Rev. A )