Lecture 41.pdf - CS324 Computer Architecture Lecture 41 Memory Performance Main Memory Architecture Performance Measures of Main Memory Improving Memory

Lecture 41.pdf - CS324 Computer Architecture Lecture 41...

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CS324: Computer Architecture Lecture 41: Memory Performance Main Memory Architecture Performance Measures of Main Memory Improving Memory Performance Dr. G. Abbas 18/12/2018 Reading Sections: Computer Architecture: A Quantitative Approach, Sixth Edition, Section 2.2
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2 CS324 Computer Architecture MAIN MEMORY ARCHITECTURE Rank: a collection of DRAM chips that work together to respond to a request and keep the data bus full A 64-bit data bus will need 8x8 DRAM chips or 4x16 DRAM chips or… Bank: a subset of a rank. Used for memory level parallelism Row buffer: the last row (say 8KB) read from a bank. Acts like a cache Processor Memory Controller Address/Cmd Data DIMM Bank Row Buffer
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3 CS324 Computer Architecture IMPROVING MEMORY PERFORMANCE DRAMs are organized in banks Each bank consists of a series of rows. A DRAM access is divided into row access and column access. DRAMs must buffer a row of bits inside the DRAM for the column access.
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4 CS324 Computer Architecture
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