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MCU /Ma in Memory Overview
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Figure 6-9.
Typical MEMLOGAN Pr intout
for the presence of a "1" (CIO-Read Scan) and send the address of
where
the "I" was stored to the lOP Bus
(RIO-Address).
Direct
commands clear
the I/O Logging Array
(WID-Load Block)
and then
transfer
these zeros
into
the Error
Logging Array
(WID-Write
Copy).
The
Er
ror Logging Array would then be cleared and able to
start a new
fault logging sequence.
Interrogating and
writing
into
the Error Logging Array can only occur during refresh time.
The following paragraphs
explain
in
detail
the
control
word
formats.
6-44. TID Command.
Figure 6-10 shows
the word format for
a TID
instruction.
This instruction can be executed any time.
Bit 0,1,
and 2
Bit 3
Bit 4
Bit 5
Bit 7
These bits have the standard I/O significance.
Read Scan.
This bit
is set
when a Read
Scan is
in
process
and remains set until the completion or term-
ination of the scan.
DISWEC.
This bit is set if the
Disable Error Correc-
tion flip-flop
(DISWEC) is set.
L/NU S12K.
If bit 5
=
1, then the
upper
Sl2K
Er ror
Logging Array
has been selected.
If bit 5
=
0,
then
the lower S12K Error Logging Array has been selected.
Read Copy Error.
This bit is set if there are one
or
more errors (l's stored in Error Logging Array) during
a Read Copy.
This bit is cleared by any
CIO
or
WID
Instr uction.
6-23
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