Parity Errors; Table 5 Parity Error Cases - Quantum LTO 2 User Manual

Parity Errors

Table 5 Parity Error Cases

State or Phase
Bus Free State
Arbitration Phase
Selection Phase
Selection, Message Out
Phase (Identify
Message)
LTO-2 SCSI Interface Guide
Hex Code
Parallel
Protocol
Request
Table 5 describes the operation for each of the possible cases of parity
1
error.
Description
The drive does not detect nor react to parity errors on the SCSI bus while the
drive is in a bus free state.
The drive does not detect nor react to parity errors on the SCSI bus while
arbitration is being performed.
The drive does not detect nor react to parity errors on the SCSI bus while the
drive is being selected.
If the drive detects a parity error while the host is sending an Identify
message, the drive retries forever.
Message Definition
04h This message negotiates an agreement
between the initiator and the drive on
which is the best data transfer period,
offset, width and type. This is the
message to request DT (Ultra160)
synchronous transfers.
If the message is received after
selection and before Command phase,
it will then go to Message In phase and
respond with a valid response to
complete the negotiation.
If the message is received at any other
time, a Message Reject is sent in
response.
Chapter 1 SCSI Interface
Parallel SCSI Interface
9