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sp01-lw-s3

# sp01-lw-s3 - ECE 2030 C 5 problems 5 pages Problem 1(3...

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ECE 2030 C Computer Engineering Spring 2001 5 problems, 5 pages Exam Three 19 April 2001 1 Problem 1 (3 parts, 24 points) Memory Systems Imagine using a 4 Mbit DRAM organized as 1 million addresses of 4-bit words to build three memory systems. The following three parts consider memory systems built using this chip. Part A (8 points) Consider a 16 Mbit memory system organized as 4 million addresses of 4-bit words. number of chips needed in one bank 4bits/bank / 4bits/chip = 1 chip/bank number of banks for memory system 4M/system / 1M/bank = 4 banks/system memory decoder required ( n to m ) 2 to 4 number of DRAM chips required 1 chip/bank * 4 banks/sys = 4 chips Part B (8 points) Consider a 16 Mbit memory system organized as 1 million addresses of 16-bit words. number of chips needed in one bank 16bits/bank / 4bits/chip = 4 chips/bank number of banks for memory system 1M/system / 1M/bank = 1 banks/system memory decoder required ( n to m ) not required number of DRAM chips required 4 chip/bank * 1 bank/sys = 4 chips Part C (8 points) Consider an 256 Mbit memory system organized as 32 million addresses of 8-bit words. number of chips needed in one bank 8bits/bank / 4bits/chip = 2 chips/bank number of banks for memory system 32M/system / 1M/bank = 32 banks/system memory decoder required ( n to m ) 5 to 32 number of DRAM chips required 2 chip/bank * 32 banks/sys = 64 chips Problem 2 (1 part, 10 points) Instruction Formats Suppose a datapath has three operand busses (two source, one destination), 100 instruction types, and 64 registers where each register is 32 bits wide. Immediate operands can be in the range of

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sp01-lw-s3 - ECE 2030 C 5 problems 5 pages Problem 1(3...

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