Table of Contents
What are the instruction categories that exist in any ISA?
The ISA describes the (1) memory model, (2) instruction format, types and modes, and (3) operand registers, types, and data addressing. Instruction types include arithmetic, logical, data transfer, and flow control.
How do I design my own instruction set architecture?
Starts here11:13Design Your Own CPU Instruction Set – YouTubeYouTube
How do you design instruction format?
Instruction sets and types. Assembly/machine language programming. Instruction formats. Addressing modes….Type I Instructions.
| Opcode | Mnemonics | Two operand arithmetic |
|---|---|---|
| 1101 | BIS | Bit set (logical OR) |
| 1110 | XOR | Exclusive or source with destination |
| 1111 | AND | Logical AND source with destination (Dst &= Src) |
What are the factors you need to consider when designing an instruction set architecture?
In designing an instruction set, consideration is given to:
- Instruction length.
- Number of operands.
- Number of addressable registers.
- Memory organization.
- Addressing modes.
What is an instruction set architecture (ISA)?
In this article we look at what an Instruction Set Architecture (ISA) is and what is the difference between an ‘ISA’ and Microarchitecture. An ISA is defined as the design of a computer from the Programmer’s Perspective . This basically means that an ISA describes the design of a Computer in terms of the basic operations it must support.
How many registers are there in an ISA?
Most modern ISAs have 8 to 32 registers. What size data bus do we want? This effectively sets the natural word size of the ISA. And because the CPU will want to fetch in word units, this also influences the size of our instructions.
What is the ISA of a processor?
The ISA defines the types of instructions to be supported by the processor. These Instructions perform various Arithmetic & Logical operations on one or more operands. These instructions are responsible for the transfer of instructions from memory to the processor registers and vice versa.
What is an ISA and why do we need one?
Our goal, in designing an ISA is to make a CPU which has enough functionality so that programmers can write programs for it. As we saw last week, we need instructions to do basic maths, data comparisons, deal with data of different sizes, and instructions to branch and jump (so we can implement decisions, loops and functions).