Phase #(18)21 Tests - AT&T 3B2 Off-Line Diagnostic Manual

Version 2 Hardware System Board Diagnostics - - - - - - - - - - - - - - - - - - - - -
Warnings: This diagnostic code assumes the disk is formatted and that known defects
have been mapped on cylinder
o.
Defects on the diagnostic cylinder which
have not been mapped may cause the diagnostic to fail. The last cylinder is
the diagnostic cylinder.
It
is the only cylinder that is written by this diagnostic
unless a defective sector(s) is mapped to cylinder O.
Phase #( 18)21 Tests
Test Number: 1
Function: This test pattern tests the command parameter First-In-First-Out (FIFO) for
write/read capability.
Procedure: Each byte of the FIFO is written and read with a different pattern.
Hardware Tested: The uPD7261 Hard Disk Controller is tested.
Data Returned: The failing test number is returned.
Test Number:
Function:
Procedure:
Supplemental Data: The expected and failing test patterns are returned.
2
This test verifies that the disk controller can be set up in the required modes of
operation by use of the specify command.
The specify command is issued to set up the disk controller in the following
modes:
Mode:
MDU=O
ECC = 0
CRCS = 0
SSEC = 1
STP = OxOe
Data Length:
(MFM recording)
(CRC bytes appended to data)
(CRC generator polynomial)
(Floppy-like interface)
(Stepping rate = 30ms)
CRC = 1 (Initial value of polynomial counter)
PAD = 1 (ID data pad = OxO)
POL = 1 (Polling mode disabled)
DTL = Ox200 (Data length = 512 bytes)
ETN =
*
(End track - 1)
ESN = Oxll (End sector - 1)
GPL2 = OxOd (Gap length 2)
RWC = Ox0080 (Reduce write current cylinder no.)
*
Value dependent on type of disk.
Hardware Tested: The uPD7261 Hard Disk Controller is tested.
Data Returned: The failing test number is returned.
Supplemental Data: The error status is returned.
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