LSI 53C875A - Manual (Page 48)

2-26 Functional Description
Table 2.4 SCSI Parity Control
EPC
1
1. EPC = Enable Parity Checking (bit 3 SCSI Control Zero (SCNTL0) ).
ASEP
2
2. ASEP = Assert SCSI Even Parity (bit 2 SCSI Control One (SCNTL1) ).
Description
0 0 Does not check for parity errors. Parity is generated when sending
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.
1 0 Checks for odd parity on SCSI data received. Parity is generated when
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.
Table 2.5 SCSI Parity Errors and Interrupts
DHP
1
1. DHP = Disable Halt on SATN/ or Parity Error (bit 5 SCSI Control One (SCNTL1) ).
PAR
2
2. PAR = Parity Error (bit 0 SCSI Interrupt Enable Zero (SIEN0) ).
Description
0 0 Halts when a parity error occurs in the target or initiator mode and does
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.
1 0 Does not halt in target mode when a parity error occurs until the end
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.