AT&T 3B2 Off-Line Diagnostic Manual page 566

Phase
De~criptions
Phase #1 - SCSI CIO Sanity
Phase Name:
Type:
Function:
Test:
Time:
Warnings:
Notes:
Phase #1 Test
Test Number:
Function:
Procedure:
SCSI CIO Sanity Test
Demand
This phase tests the integrity of the CIO queue.
Test 1 - verifies that the diagnostic results can be transferred to the SBD.
1 second
None
This phase is used to determine the basic sanity of the Common I/O (CIO)
portion of the SCSI. The "procedure" used in this phase is used by all other
diagnostic phases to execute tests and return results to the System Board (SBD).
If the SCSI cannot execute this phase, it will not successfully run any other
phase. When this phase fails, a "Phase Time-out" message usually occurs.
This means that the SBD tried to communicate with the SCSI, but timed out
while waiting for a response. If this phase fails, the following hardware may
be faulty:
• INTEL 80186 Microprocessor
• SCSI Input/Output (I/O) interface circuitry
• SCSI Random Access Memory (RAM)/Read Only Memory (ROM)
• SCSI Address/Data bus.
1
This test verifies the integrity of the CIO queue.
This test uses the following standard procedure:
1. The I/O slot number of the Host Adapter card is determined.
2. The SCSI is reset.
3. The sysgen data block is initialized.
4. The SCSI is initialized (sysgen) by sending express [Interrupt 0 (INTO)]
and attention (INTI) interrupts sequentially.
5. The X86 code is downloaded by using the CIO firmware command
[Force Call to Function (FCF)].
Hardware Tested: The CIO hardware on the Host Adapter is tested.
Data Returned: The test number that failed, the actual data, and the expected data are returned.
14-2 OFF-LINE DIAGNOSTIC MANUAL