DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-1344PROCR (RISC Processor Circuit Pack)
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Memory circuit pac ks, but part of this func tion is on the Processor as well. Refer
to Memory documentation for test informat ion.
The Processor circuit pack c ontains a Write Buffer function that helps prevent
internal processing op erations from being held up by Processor Bus activity. If
the Processor needs to write to Memory, it writes to the Write Buffer. If the
Processor Bus is in use at this time, the information is transferred to Memory at an
appropriate time. Up to 12 processor writes can b e pending, waiting for transfer
to memory.
The Processor Bus contains parity check ing functions. If one add ress or data bit
is corrupted d uring an access c ycle, the error detection log ic detects and
reports this to Processor circuit p ack.
The Processor circuit pack c ontains interrupt and exce ption signals that tell the
Processor when normal or erroneous events occur in SPE comp onen ts. An
example of a normal event is an interrup t that occurs when data p rovided by an
SPE component such as the SYSAM is available for the Processor. An example
of an error-indicating exc eption is detection of a parity error on the Bus when
Processor reads Memory. These types of errors result in system recovery action s
which are described in Chapter 4, ‘‘Initialization and Recovery’’.
The Processor circuit pack c ontains an erasable, programmab le read-only
memory (BOOTPROM) that contains the system initialization and low-level
diagnostic p rograms. Problems in this hardware may result in diffic ulties with
syste m star t-up , resta rt, o r SPE maint enanc e tes ting in ge neral .
If the PBX system is equipped with Hig h Reliability or Critical Reliability option
(i.e. with d upl icate d SPEs), and i f a fai lure o f the a ctive Proce ssor c ircu it pa ck
causes a MAJOR on-board alarm, a SPE interchange will oc cur if the health of
the standby SPE permits the interchange. Refer to Replac ing SPE Circuit Packs
in Chapter 5 for more information about d uplicated SPEs.