Specifications

11.2.8 Test 12: Local RAM Fixed Pattern Test
This BIST performs a short test on local RAM. The range of memory to be tested depends upon
the test handler from which the BIST was invoked.
When the test is executed from the power-up test handler, it is necessary to limit execution time;
therefore the test range is limited to the block of RAM before the video memory hole, i.e. 30000H
to 9FFFFH.
When the test is executed from the slave test handler, e.g. during soak testing, the test range is
limited to 64 Mbytes; however, each time the BIST is executed it tests a different block.
Therefore, over the duration of a soak-test run, the whole of memory will be tested a number of
times, but the overall test coverage will be improved for large memory capacity boards.
When the test is executed from the master test handler, the test range is from 1 Mbyte to the top
of fitted memory. However, BIST parameters can be used to specify a different test range. Note
that the video memory hole between A0000h and BFFFFh must be avoided.
First, the memory under test is initialized to 00000000. Then two “marches” are made through
memory with patterns as follows:
pass 1 new=FFFFFFFF old=00000000
pass 2 new=00000000 old=FFFFFFFF
During the march through the memory range, for every 32-bit word location, first the old pattern
is verified, then the new pattern is written and verified.
To reduce execution time this BIST runs from DRAM; however, the area of memory from which
the test code executes is first tested by the ROM-based version of the routine.
Error codes:
0300h - Test failed. For details see accompanying message.
11.2.9 Test 13: SCC Access Test
This BIST performs a read-after-write test on the serial channel of the board.
The serial controller’s scratch register is used for this test. A write-then-read of a shifting one
value is used to test access to the device. The value is written then read and verified.
Error codes:
0480h - Failure on channel. Accompanying message gives further details
11.2.10 Test 19: NMI Test
This test checks NMI interrupt from front panel switch. The switch “Front Panel Switch Function”
on the board must be set to NMI position.
Error codes:
0401h - no interrupt
0402h - wrong interrupt
0403h - wrong interrupt source.
11-4 VP 110/01x
VSA Mode Diagnostics