Specifications

Network Processing Engine Replacement Instructions 9
Network Processing Engine Description
Note To prevent DRAM errors in the NPE-100, NPE-150, or NPE-200, and to ensure that your
system initializes correctly at startup, DRAM bank 0 (socket U18 and U25, or U11 and U25) must
contain no fewer than two SIMMs of the same type. You may also install two SIMMs of the same
type in bank 1 (socket U4 and U12, or U42 and U52); however, bank 0 must always contain the two
largest SIMMs.
Table 2 lists the NPE-175 and NPE-225 memory specifications.
Table 2 NPE-175 and NPE-225 Memory Specifications
Memory Type Size Quantity Description Location
SDRAM 64 or 128 MB 1 configurable bank
with 1 SDRAM slot
DIMM U15
Boot ROM 512 KB OTP
1
ROM for the
ROM monitor
program
1 OTP = one time programmable.
U1
Primary cache 16 KB (instruction),
16 KB (data)
R527x processor
primary internal cache
U4
32 KB (instruction),
32 KB (data)
R527x processor
primary internal cache
U4
Unified cache 2 MB 4 chips, each 512K by
8 bits wide
Secondary external
cache for the R527x
processor
U5, U6, U7,
U8
2
2 Located on Processor Engine board.
Table 3 lists the NPE-300 memory specifications.
Table 3 NPE-300 Memory Specifications
Memory Type Size Quantity Description Location
SDRAM 32 to 128 MB 1 configurable
1
bank with 2
SDRAM slots
1 Bank 0 is used exclusively for packet memory and is not user configurable.
32-, 64-, or 128-MB DIMMs (based on
maximum SDRAM required)
Bank 1: U45 and U44
2
2 Bank 1 contains the Cisco IOS software, processor memory, and packet memory.
Boot ROM 512 KB 1 OTP
3
ROM for the ROM monitor program
3 OTP = one time programmable.
Socket U1
Primary cache 16 KB
(instruction),
16 KB (data)
RM7000 processor primary internal cache Socket U49
Unified cache 256 KB Secondary RM7000 processor internal,
unified instruction and data cache
Socket U49
Integrated
cache
2 MB (fixed) Tertiary external cache for the RM7000
processor