AT&T 3B2 Off-Line Diagnostic Manual page 618

Ph.s. D.scrlptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Phase #4
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Lower RAM Write/Read Test
Phase Name:
Type:
Function:
Tests:
Time:
Warnings:
Notes:
Phase #4 Tests
Network Access Unit Lower RAM (raITLl)
Demand
This phase checks the operation of the lower half of the Network Access Unit
RAM.
Test 1 - writes OxOOOO to each memory location and verifies the write with a
read.
Test 2 - writes OxFFFF to each memory location and verifies the write with a
read.
Test 3 - writes Ox5555 to each memory location and verifies the write with a
read.
Test 4 - writes OxAAAA to each memory location and verifies the write with
a read.
Test 5 - walks a one through a field of zeros in every memory location and
verifies the walk with a read.
Test 6 - walks a zero through a field of ones in every memory location and
verifies the walk with a read.
10 seconds
None
None
Test Numbers: 1 through 6
Function: These tests verify the operation of the lower half of the Network Access Unit
RAM, addresses OxOOOO to Ox3FFF.
Procedure: Write a known data pattern to every memory location (lower half) and verify
the write with a read.
Hardware Tested: The Network Access Unit RAM (lower half) is tested.
Data Returned The failed test number, the data pattern read, and the data pattern written are
returned.
15-8 OFF-LINE DIAGNOSTIC MANUAL