
2-6
Functional Description
1
0
0
0
Does not check for parity errors.
Parity flows from DP[2:0] through
the chip to the SCSI bus when sending SCSI data. Parity flows from
the SCSI bus to DP[3:0] when receiving SCSI data. Asserts odd
parity when sending SCSI data, and even parity when sending host
data.
1
0
0
1
Does not check for parity errors.
Parity flows from DP[3:0] through
the chip to the SCSI bus when sending SCSI data. Parity flows from
the SCSI bus to DP[3:0] when receiving SCSI data. Asserts even
parity when sending SCSI data and host data.
1
0
1
0
Checks for odd parity on SCSI data received and even parity on
system data when sending.
Parity flows from DP[3:0] through the
chip to the SCSI bus when sending SCSI data. Parity flows from the
SCSI bus to DP[3:0] when receiving SCSI data. Asserts odd parity
when sending SCSI data and even parity when sending host data.
1
0
1
1
Checks for odd parity on SCSI data received and even parity on
system data when sending.
Parity flows from DP[3:0] through the
chip to the SCSI bus when sending SCSI data. Parity flows from the
SCSI bus to DP[3:0] when receiving SCSI data. Asserts even parity
when sending SCSI data and host data.
1
1
0
0
Does not check for parity errors.
Parity on DP[2:0] is ignored, and
DP3 becomes ABORT/. Parity is generated when sending SCSI
data. Parity flows from the SCSI bus to the chip but is not asserted
on DP[3:0] when receiving SCSI data. Asserts odd parity when
sending SCSI data.
1
1
0
1
Does not check for parity errors.
Parity on DP[2:0] is ignored, and
DP3 becomes ABORT/. Parity is generated when sending SCSI
data. Parity flows from the SCSI bus to the chip, but is not asserted
on DP[3:0] when receiving SCSI data. Asserts even parity when
sending SCSI data.
1
1
1
0
Checks for odd parity on SCSI data received.
Parity on DP[2:0] is
ignored, and DP3 becomes ABORT/. Parity is generated when
sending SCSI data. Parity flows from the SCSI bus to the chip, but
is not asserted on DP[3:0] when receiving SCSI data. Asserts odd
parity when sending SCSI data.
1
1
1
1
Checks for odd parity on SCSI data received.
Parity on DP[2:0] is
ignored, and DP3 becomes ABORT/. Parity is generated when
sending SCSI data. Parity flows from the SCSI bus to the chip, but
is not asserted on DP[3:0] when receiving SCSI data. Asserts even
parity when sending SCSI data.
1. Even Parity.
2. Enable Parity Generation.
3. Enable Parity Checking.
4. Assert SCSI Even Parity.
Table 2.1
Parity Control (Cont.)
EVP
1
EPG
2
EPC
3
AESP
4
Description