Problem on ARM microprocessor
The ARM microprocessor consists of 32 bit instructions and 32 bit registers. Demonstrate why this means that immediate addressing can't be used to load a register with 32 bit constant.
Expert
Each instruction is 32bits long in the ARM processor. Out of 32 bits, 4 bits are taken by instructions since there are 16 condition codes. After that there are 2x four for the destination and first operand registers, one for set-status flag, and then the assorted number of bits for other matters like the actual opcodes. As a result only 12 bits are left for use as immediate value.
So total number of distinct immediate value that can be taken = 2^12 = 4096. So In arm Microprocessor only 4096 values can be used as immediate addressing. The problem is after assigning bits to instruction-type, registers and other fields, there's very little room for actual numbers left.
Hence only a limited number of distinct values can be used for immediate addressing. The number of distinct values is 4096. Hence instead of 2^32, there are only 4096 immediate addressing.
Instead of just taking the 12 bits for a single integer, the designers have done is split it into an 8bit number (n) and a 4bit rotation field (M). The barrel shifter is employed for implementation purpose. The total immediate value v is given by: N×2^ (2M).
Illustrate the term computer graphics?
What is NLX? What are the different types of Form Factors of Power Supply?
Write down the types of control organization.
Give a brief explanation of Error detection code.
Write down the use of pretty printer.
What is Nehalem Architecture?
Give a brief explanation of content addressable memory.
Describe the approach in which the validity fault handler concludes?
Explain briefly in what technique the Interrupt handlers and the Fault Handlers are dissimilar?
Give a brief explanation of the term AI.
18,76,764
1955177 Asked
3,689
Active Tutors
1446502
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!