Assume a CPU has 8 registers (3 bits), 32 op-codes (5 bits), 15-bit addresses, 16- bit integers. Which ISA accesses memory the least? 0-address (8 instructions, 5 data references) 1-address (9 instructions, 9 data references) 12-address (6 instructions, 5 data references) 2-address (6 instructions, 15 data references) 3-address (4 instructions, 9 data references) 3-address (regs) (3 instructions, 5 data references) - - -

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter3: Data Representation
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Assume a CPU has 8 registers (3 bits), 32 op-codes (5 bits), 15-bit addresses, 16-
bit integers. Which ISA accesses memory the least?
0-address (8 instructions, 5 data references)
1-address (9 instructions, 9 data references)
12-address (6 instructions, 5 data references)
2-address (6 instructions, 15 data references)
3-address (4 instructions, 9 data references)
3-address (regs) (3 instructions, 5 data references)
Transcribed Image Text:Assume a CPU has 8 registers (3 bits), 32 op-codes (5 bits), 15-bit addresses, 16- bit integers. Which ISA accesses memory the least? 0-address (8 instructions, 5 data references) 1-address (9 instructions, 9 data references) 12-address (6 instructions, 5 data references) 2-address (6 instructions, 15 data references) 3-address (4 instructions, 9 data references) 3-address (regs) (3 instructions, 5 data references)
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