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Chapter 2 NPE-175 and NPE-225 Overview
NPE-175 and NPE-225 Description and Overview
Figure 2-2 NPE-225
The NPE-175 and NPE-225 consist of the following components:
• Reduced instruction set computing (RISC) microprocessor
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The NPE-175 has an RM5270 microprocessor that operates at an internal clock speed of
200 MHz.
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The NPE-225 has an RM5271 microprocessor that operates at an internal clock speed of
262 MHz.
• System controller
The system controller provides hardware logic to interconnect the processor, DRAM, and the
PCI-based system backplane bus. The NPE-175 and NPE-225 have one system controller that
provides processor access to the two midplane and single I/O controller peripheral component
interconnect (PCI) buses. The system controller also allows port adapters—on either of the two
midplane PCI buses—access to SDRAM.
• Upgradable memory modules
The NPE-175 and NPE-225 use SDRAM for providing code, data, and packet storage.
• Cache memory
The NPE-175 and NPE-225 have unified cache SRAM that functions as the secondary cache for the
microprocessor. (The primary cache is within the microprocessor.)
• Two environmental sensors for monitoring the cooling air as it leaves the chassis
1Network controller board 6Handle
2System controller 7Midplane connectors
3Processor engine board 8Boot ROM (U1)
4Captive installation screw 9Temperature sensor
5RM5271 microprocessor 10 SDRAM DIMM (U15)
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