2-26
Functional Description
The AIP error status and the live AIP code values are captured in the
register for debug purposes. AIP checking
is enabled by setting bit 6 in the
register.
AIP generation occurs by default and may be disabled by setting bit 3,
Disable AIP Code Generation, in
The sequence ID is reset on any phase change, chip reset, bus free, or
synchronous phase. It is also reset by writing the RSQAIP bit in the
register. The AIP sequence value can be read
using this register (SEQAIP).
All AIP errors are treated in the same fashion as parity errors. Bit 0 of
the
SCSI Interrupt Status Zero (SIST0)
register indicates if SCSI parity,
CRC, or AIP errors are present. The AIPERR bit in the
register indicates if the error is an AIP error.
2.2.5.4 Register Considerations
The following is a summary of the registers and bits required to enable
Ultra160 SCSI on the LSI53C1000.
•
The PCI
register value must be 0x21.
•
The PCI
register contains a value of 0x12, indicating
it requires the bus every 4.5
µ
s.
•
The
register:
–
Bit 3, EPC (Enable Parity/CRC/AIP Checking) is set to enable
the CRC feature.
–
Bit 1, AAP (Assert SATN/ on Parity/CRC/AIP Error), is set in the
initiator mode to automatically assert SATN/ on the detection of
an error.
•
The
register:
–
Bit 5, DHP (Disable Halt on Parity/CRC/AIP Error or ATN) (Target
Only), is set in accordance with user requirements. When bit 5
is cleared, a SCSI transfer halts if an error occurs. When bit 5 is
set, a SCSI transfer continues if an error occurs.
•
The
register:
–
Bit 7 is now reserved. It was previously the Ultra Enable bit.
Содержание LSI53C1000
Страница 6: ...vi Preface...
Страница 16: ...xvi Contents...
Страница 28: ...1 12 Introduction...
Страница 234: ...4 124 Registers...
Страница 314: ...6 40 Specifications This page intentionally left blank...
Страница 318: ...6 44 Specifications This page intentionally left blank...
Страница 344: ...6 70 Specifications This page intentionally left blank...
Страница 350: ...6 76 Specifications Figure 6 42 LSI53C1000 329 Ball Grid Array Bottom view...
Страница 352: ...6 78 Specifications...
Страница 360: ...A 8 Register Summary...
Страница 376: ...IX 12 Index...