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DP8496 Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP8496
Description  SCSI-2 Disk Data Controller
PDF  92 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8496 Datasheet(HTML) 18 Page - National Semiconductor (TI)

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40 Functional Description (Continued)
TABLE 410 Operation of Parity Generation and Checking
Control Bits (SUP2)
Direction of Transfer
Action on Port
Report
Error
SPEN
DBPEN
SPP
DBPP
Disk
Buffer
SCSI
0
1
x
x
SCSI to Buffer
Generate
1
x
0
0
SCSI to Buffer
Check
Check
1
1
x
1
1
SCSI to Buffer
Check
Check
1
1
x
0
1
SCSI to Buffer
Inv aCheck
Check
1
1
x
1
0
SCSI to Buffer
Inv aCheck
Check
1
x
0
x
x
Buffer to SCSI
Generate
0
1
0
0
Buffer to SCSI
Check
2
0
1
1
1
Buffer to SCSI
Check
2
0
1
0
1
Buffer to SCSI
Inv aCheck
2
0
1
1
0
Buffer to SCSI
Inv aCheck
2
1
1
0
0
Buffer to SCSI
Check
2
1
1
1
1
Buffer to SCSI
Check
2
1
1
0
1
Buffer to SCSI
Invert
Check
2
1
1
1
0
Buffer to SCSI
Invert
Check
2
x
0
x
x
Not between SCSI
Buffer
x
1
x
x
Disk to Buffer
Generate
x
1
x
0
Buffer to Disk
Check
Invert
3
x
1
x
1
Buffer to Disk
Check
3
x
1
x
x
Processor to Buffer
Generate
x
1
x
x
Buffer to Processor
Check
4
Error Reporting
1 SCSI Bus Error in CIC field of SINT register (49h) and SCSI Parity Error in SSTAT register (48h)
2 Buffer Parity Error in CIC field of SINT register and Buffer Memory Error in SSTAT register
3 Error in DINT register (12h) and Disk Parity error in EC field of DSTAT register (14h)
4 PEP bit in the SOP register (43h)
18



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