Service manual

108 System Tests
Table C–1 SCSI-B Error and Status Summary
Value Error
0 Success
1 Controller error:
DMA bit will not set in the SCSI-B controller mode register.
Target command register not valid.
Initiator command register not valid.
Bus free not valid.
Phase match bit in bus and status register not valid.
Interrupt request bit in bus and status register not valid.
2 Data path error:
Data path in longword, word, or byte access failed; unable to access all
of data buffer.
Unable to reach SCSI-B controller; unable to write to mode register.
3 DMA count error:
Count register not verified.
Count not 0 after DMA transfer.
4 Timeout error:
No phase match within timeout period.
5 Interrupt error:
Interrupt not received when expected.
An error occurred while testing the system interrupt logic.
6 Unexpected interrupt error:
Unexpected interrupt received.
7 Command error:
Request sense command ended without sense data. Command
terminated with bad device status.
8 Phase error:
Unexpected phase or phase change on SCSI-B bus.
9 Buffer overflow error:
Too many bytes read from target.