Fast Hold Time (10 Ns); Fast Negation Period (30 Ns) - Seagate SCSI Interface Product Manual

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2.3.4

Fast hold time (10 ns)

This value is the minimum time added between the assertion of REQ or ACK and the changing of the data lines
to provide hold time in the initiator or target respectively, while using fast synchronous data transfers.
2.3.5

Fast negation period (30 ns)

This value is the minimum time that a target shall negate REQ while using fast synchronous data transfers.
Also, the minimum time that an initiator shall negate ACK while using fast synchronous data transfers.
SCSI Interface Product Manual, Rev. J