Technical data

3-80 Computer Group Literature Center Web Site
Test Descriptions
3
SFIFO - SCSI FIFO
Command Input
PPCx-Diag>ncr sfifo
Description
This procedure tests the basic ability to write data into the SCSI FIFO and
retrieve it in the same order as written. The SCSI FIFO is checked for an
empty condition following a software reset, then the SFWR bit is set and
verified. The FIFO is then filled with 8 bytes of data verifying the byte
count with each write. Next the SFWR bit is cleared and the FIFO read,
verifying the byte count with each read.
If no errors are detected, the NCR device is reset; otherwise the device is
left in the test state.
Response/Messages
After the command has been issued, the following line is printed:
NCR SFIFO: SCSI FIFO....................... Running --->
If all parts of the test are completed correctly, then the test passes:
NCR SFIFO: SCSI FIFO....................... Running ---> PASSED
If any part of the test fails, then the display appears as follows:
NCR SFIFO: SCSI FIFO....................... Running ---> FAILED
NCR/SFIFO Test Failure Data:
(error message)
Here (error message) is one of the following:
SCSI FIFO is not initially empty
SCSI FIFO writes not enabled
SCSI FIFO Count Error:
Address =________, Expected =__, Actual =__
SCSI FIFO Error:
Address =________, Expected =__, Actual =__