LSI 53C875A User Manual
2-26
Functional Description
Table 2.4
SCSI Parity Control
EPC
1
1. EPC = Enable Parity Checking (bit 3
ASEP
2
2. ASEP = Assert SCSI Even Parity (bit 2
Description
0
0
Does not check for parity errors. Parity is generated when sending
SCSI data. Asserts odd parity when sending SCSI data.
SCSI data. Asserts odd parity when sending SCSI data.
0
1
Does not check for parity errors. Parity is generated when sending
SCSI data. Asserts even parity when sending SCSI data.
SCSI data. Asserts even parity when sending SCSI data.
1
0
Checks for odd parity on SCSI data received. Parity is generated when
sending SCSI data. Asserts odd parity when sending SCSI data.
sending SCSI data. Asserts odd parity when sending SCSI data.
1
1
Checks for odd parity on SCSI data received. Parity is generated when
sending SCSI data. Asserts even parity when sending SCSI data.
sending SCSI data. Asserts even parity when sending SCSI data.
Table 2.5
SCSI Parity Errors and Interrupts
DHP
1
1. DHP = Disable Halt on SATN/ or Parity Error (bit 5
PAR
2
2. PAR = Parity Error (bit 0
Description
0
0
Halts when a parity error occurs in the target or initiator mode and does
NOT generate an interrupt.
NOT generate an interrupt.
0
1
Halts when a parity error occurs in the target mode and generates an
interrupt in the target or initiator mode.
interrupt in the target or initiator mode.
1
0
Does not halt in target mode when a parity error occurs until the end
of the transfer. An interrupt is not generated.
of the transfer. An interrupt is not generated.
1
1
Does not halt in target mode when a parity error occurs until the end
of the transfer. An interrupt is generated.
of the transfer. An interrupt is generated.