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sp01-sw-s3a - ECE 2030 1:00pm 4 problems 4 pages Problem...

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ECE 2030 1:00pm Computer Engineering Spring 2001 4 problems, 4 pages Exam Three 18 April 2001 1 Problem 1 (3 parts, 30 points) Memory Systems Imagine using a 64 Mbit DRAM organized as 4 million addresses of 16-bit words to build three memory systems. The following three parts consider memory systems built using this chip. Part A (10 points) Consider 8 million addresses of 64-bit words memory system. number of chips needed in one bank 64bit/bank / 16bits/chip = 4 chips/bank number of banks for memory system 8M/system / 4M/bank = 2 banks/system memory decoder required ( n to m ) 1 to 2 number of DRAM chips required 4 chips/bank * 2 banks/sys = 8 chips Part B (10 points) Consider 32 million addresses of 128-bit words memory system. number of chips needed in one bank 128bit/bank / 16bits/chip = 8 chips/bank number of banks for memory system 32M/system / 4M/bank = 8 banks/system memory decoder required ( n to m ) 3 to 8 number of DRAM chips required 8 chips/bank * 8 banks/sys = 64 chips Part C (10 points) Consider 128 million addresses of 256-bit words memory system. number of chips needed in one bank 256bit/bank / 16bits/chip = 16 chips/bank number of banks for memory system 128M/system / 4M/bank = 32 banks/system memory decoder required ( n to m ) 5 to 32
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