Tandberg Data
Selftest and Diagnostics
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10-2
Tandberg SLR Reference Manual
10.2. Power-on Selftest
The main objective for the Power-on Test is to exercise most of the drive’s functionality
without requiring any cartridge to be inserted.
Starting the Test
The Power-on Selftest is started whenever power is
applied to the drive.
Test Sequence
The Power-on Selftest is run at three different stages
during Power-up. The core part is run during early
initialization. A few areas of conflicts are placed in
a middle section. More complex and time-consuming tests
are put at the end allowing other parts of the FW to
operate in parallel.
POST Stage 1
•
FLASH Memory Check
.
This is a test of the Flash PROM integrity. A simple
checksum test is used to verify that we are operating from a completely programmed
Flash PROM. This test is a simple 32-bit sum of the whole Flash area.
•
SRAM Test
.
Complete Address test of the whole SRAM Area (64 Kbytes). The test
restores all locations that are tested.
•
EEPROM Recognize Test
.
Write/Read test of dedicated Test Cells.
•
SCSI Controller Recognize Test
.
Register Test.
•
Data Path Controller (DPC) Recognize Test
.
Register Test.
•
DPC MAC Test
.
Test of Memory (DRAM) Access Channels in DPC.
•
DRAM Test
.
Test of DRAM with support from DPC.
•
Analog Data Path (ADP) Recognize Test
.
Register Test of the Analog
Read/Write circuitry.
POST Stage 2
•
DPC Functional Tests
. Buffer interface, interrupt
logic, internal RAM’s and motor ramping control.
POST Stage 3
•
Servo Controller Test
•
Write/Read Loopback Test
•
Data Compression Test
•
ECC Functionality Test
Failure Indication
Flashing amber Failure LED when finished.
The drive goes into a ‘Secure Mode’ if the Power-on
Selftest detects any errors. Only the following SCSI
commands will be accepted: INQUIRY, REQUEST SENSE, SEND
DIAGNOSTICS and RECEIVE DIAGNOSTIC RESULTS. Other
commands will be rejected with a Check Condition
status.
Detailed information can be retrieved by the ‘Receive
Diagnostic Results’ SCSI command.
See also Appendix A for a description of the various Selftest Marker codes produced during
the power-on initialization and test sequence.
For further description of the specific Selftests, see the
Tandberg SLR24-140 Selftest
Reference Manual
.