How many bits are required for addressing (i.e. what is the size, in bits, of an address)? 30 bits O 20 bits O 64 bits O 16 bits 32 bits

Systems Architecture
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ISBN:9781305080195
Author:Stephen D. Burd
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Chapter4: Processor Technology And Architecture
Section: Chapter Questions
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How many bits are required for addressing (i.e. what is the size,
in bits, of an address)?
30 bits
20 bits
64 bits
16 bits
32 bits
Transcribed Image Text:How many bits are required for addressing (i.e. what is the size, in bits, of an address)? 30 bits 20 bits 64 bits 16 bits 32 bits
A certain ISA has a 32-bit word size, uses single word
(32-bit) instructions, has 66 opcodes, 64 registers, and
1G of byte-addressable memory. One group of
instructions in this ISA takes the form:
OPCODE | DESTINATION REGISTER | SOURCE
REG. | Flag | IMMEDIATE VALUE
Or
OPCODE | DESTINATION REGISTER | SOURCE
REG. 1 | Flag | SOURCE REG. 2
A single bit in the instruction ("Flag") is used to
differentiate these two addressing modes.
Another group of instructions takes the form
OPCODE | SOURCE/DESTINATION REGISTER |
PC OFFSET
Where PC Offset is the 2's complement "distance" from
the current PC to the labelled location.
Transcribed Image Text:A certain ISA has a 32-bit word size, uses single word (32-bit) instructions, has 66 opcodes, 64 registers, and 1G of byte-addressable memory. One group of instructions in this ISA takes the form: OPCODE | DESTINATION REGISTER | SOURCE REG. | Flag | IMMEDIATE VALUE Or OPCODE | DESTINATION REGISTER | SOURCE REG. 1 | Flag | SOURCE REG. 2 A single bit in the instruction ("Flag") is used to differentiate these two addressing modes. Another group of instructions takes the form OPCODE | SOURCE/DESTINATION REGISTER | PC OFFSET Where PC Offset is the 2's complement "distance" from the current PC to the labelled location.
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