HP 3000 Series Installation And Service Manual page 47
Intelligent network processor (rnp)
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Maintenance
The following paragraphs briefly describe each test in the
self-
tes t program.
5-5. Basic Instruction Set Test
The first portion of the self-test program is a basic instruction
set test.
Most of
the
INP
microprocessor's
instructions
are
tested.
LED 7 is lighted before the start of the test.
If the
test is successful, LED 7 is extinguished and LED 6
is
lighted.
If the test fails, LED 7 remains lighted.
5-6.
ROM Test
The second portion of the self-test program
tests
a
calculated
checksum.
The ROM contains a "burned-in" constant that is used
in the calculation of the current ROM checksum.
A net result
of
zero
should
result when the old and new checksums are compared.
This is the only test conducted on the ROM.
LED indicator
6
is
lighted
at
the
start of this test.
If the test is successful,
LED indicators 5 and 6 are lighted.
If the test fails, indicator
6 stays lit.
5-7. Timer Interrupt Test
The third portion of the self-test program
checks
to
determine
that
a
timer
interrupt
occurs.
This test includes a timing
routine that executes in 12 milliseconds.
During that
interval,
a timer interrupt should have occurred.
This test does not check
the accuracy of the timer, but rather it verifies that the inter-
rupt has actually occurred.
At the start of the test, LEDs 5 and
6 are lighted.
At the successful completion of the test,
LED
3
is
lighted
and LEDs 5 and 6 are turned off.
If the test fails,
LEDs 5 and 6 are left on.
5-8.
RAM Test
The fourth portion of the self-test
program
is
the
RAM
Test,
which
consists
of
two
routines.
In the first routine, each
memory location has its address written into
it
and
then
read
from
it, starting at location 0001 and progressing to 3FFF.
The
second routine fills memory downward with the complement
of
the
address
and
reads it upward.
LED indicator 3 is lighted at the
start of the test.
If the test is successful, LED indicator 4 is
lighted and
indicator
3
is
turned
off.
If
it
fails,
LED
indicator 3 stays lit.
A further test is performed
on
the
memory
refresh
circuitry.
Every 2 milliseconds, all of memory must be read from and written
to
by
the
hardware
to
prevent
data
loss.
If
the
refresh
circuitry
were
to fail,
it would show up as a failure in a read
from memory after this test wrote to memory.
5-4
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