Datasheet

2-3
Memory Replacement Instructions for the Network Processing Engine or Network Services Engine and Input/Output Controller
OL-8358-03
Chapter 2 SDRAM and DRAM Memory Systems Overview
Terms and Acronyms
• Nonvolatile random-access memory (NVRAM)—Stores the system configuration, environmental
monitoring logs, and the virtual configuration register.
Terms and Acronyms
• Cache memory—Memory with fast access and small capacity used to temporarily store recently
accessed data; found either incorporated into the processor or near it.
• DIMM—dual in-line memory module
• DRAM—dynamic random-access memory
• Instruction and data cache memory—Instructions to the processor, and data on which the
instructions work.
• Integrated cache—Cache that is built into the processor; sometimes referred to as internal cache.
Cache memory physically located outside the processor is not integrated, and is sometimes referred
to as external cache.
• Primary, secondary, tertiary cache memory—Hierarchical cache memory storage based on the
proximity of the cache to the core of the processor. Primary cache is closest to the processor core
and has the fastest access. Secondary cache has slower access than primary cache, but faster access
than tertiary cache.
• OTP—one time programmable
• RAM—random-access memory
• RISC—reduced instruction set computing
• ROM—read-only memory
• SIMM—single in-line memory module
• SODIMM—small outline dual in-line memory module
• SDRAM—synchronous dynamic random-access memory
• SDRAM-fixed—SDRAM that is a fixed size or quantity; can be replaced, but not upgraded.
• SRAM—static random-access memory
• Unified cache—Instruction cache and data cache are combined. For example, a processor may have
primary cache with separate instruction and data cache memory, but unified secondary cache.