SCSI Functional Description
2-29
–
Bit 2, RAIPERR (Reset AIP Error), allows an AIP error condition
to be reset manually.
–
Bit 1, FBAIP (Force Bad AIP Value), causes bad AIP values to
be sent over the SCSI bus.
–
Bit 0, RSQ (Reset AIP Sequence Value), causes the sequence
value used in the calculation of the protection code to be reset.
•
The
register:
–
Bits [15:0], the CRC Pad byte value, contain the value placed
onto the bus for the CRC pad bytes.
•
The
register:
–
Bit 7, DCRCC (Disable CRC Checking), is set to cause the
internal logic to not check or report CRC errors during Ultra160
transfers. The device continues to calculate and send CRCs as
requested by the target per SPI-3 specification.
–
Bit 6, DCRCPC (Disable CRC Protocol Checking) causes the
LSI53C1000 to not check for a CRC request prior to a phase
change on the SCSI bus. This condition creates a SCSI error
condition and makes the device noncompliant with the SPI-3
specification. Do not set these bits under normal operating
conditions.
–
Bit 5, RSTCRCINT (Reset CRC Interval Counter) resets the
internal CRC interval counter to zero.
–
Bit 4 is reserved.
–
Bits [3:0], CRCINT[3:0] (CRC Request Interval (Target Mode
only)), determine when a CRC request is sent by the device
when operating in target mode and transferring data in the DT
Data-In or DT-Data Out phases.
•
The
register:
–
Bit 7, CRCERR (CRC Error), indicates whether or not a CRC
error has been detected during a DT Data In SCSI transfer. This
bit is independent of the DCRCC bit setting. To clear this
condition, either write this bit to a one or read the SIST0 and
SIST1 registers. When CRC checking and the Parity/CRC/AIP
Error interrupt are both enabled, CRCERR is mirrored in the
SIST0 register, bit 0, as a Parity/CRC/AIP error.
–
Bit 6 is reserved.
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...