Re: [問題] 關於中興95年計概轉學考考題
※ 引述《hothero (hothero)》之銘言：
: (a)A single board computer has four data register (R0 to R3),1024 words
: in memory,and 16 different instructions (Add,Subtract,Load,etc.),and the
: length of a program is limited within 512 lines.What is the minimum size of
: an instruction in bits if a typical instruction uses the format:Load [123] R1,
: which means to load the data at the address 123 to register R1.
Instruction Format:
op rd address
0000 00 00.....00
op:opcode , 可以做16個運算 , 4個bit去表示
rd:register destination operand, 在這R0 to R3 ,2個bit
address:假設1個 word= 8 bytes=64 bits , 1024 words就總共2^16 , 16個bit
所以指令長度是 4+2+16= 22 bits
: (b)If the computer uses the same size of word for data and instructions,
: what is the size of each data register?
Pentium架構的cpu:
一個word=64 bits
: (c)What is the size of the program counter in bits?
64 bits
: (d)What is the size of the address bus?
36 bits (Addressable 64G)
(e)What is the size of the control bus?
I don't know.
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