Prp Sdram; Prp Sram - Cisco XR 12410 Installation Manual

Troubleshooting the Processor Subsystem

PRP SDRAM

Caution

PRP SRAM

Cisco XR 12410 Router Installation Guide
4-22
The PRP uses Error Checking and Correction (ECC) Synchronized Dynamic
Random Access Memory (SDRAM) to store routing tables, protocols, network
accounting applications, and to run Cisco IOS XR software.
Table 4-3 lists the DRAM configurations for the PRP. If you are using:
One DIMM—Bank 1 (U15) must be populated first.
•
Two DIMMs—You cannot mix memory sizes; both banks must contain the
•
same size DIMM.
Table 4-3 PRP DRAM Configurations
Total
SDRAM SDRAM Sockets
1
512 MB U15 (bank 1)
U18 (bank 2)
1 GB U15 (bank 1)
U18 (bank 2)
2 GB U15 (bank 1)
U18 (bank 2)
1. Default shipping configuration.
DRAM DIMMs must be 3.3-volt, 60-nanosecond devices only. Do not attempt to
install other devices in the DIMM sockets. To prevent memory problems, use the
Cisco approved memory products listed in
Static Random Access Memory (SRAM) provides 2 MB of secondary CPU cache
memory. Its principal function is to act as a staging area for routing table updates,
and for information sent to and received from the line cards. SRAM is not
user-configurable and cannot be upgraded in the field.
Chapter 4 Troubleshooting the Installation
Number of DIMMs
One 512 MB DIMM
or
Two 256 MB DIMMs
One 1 GB DIMM
or
Two 512 MB DIMMs
Two 1 GB DIMMs
Table 4-3.
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