Register Transfer Language

Register Transger Language

The symbolic notation used to describe the micro operation transfers among register is called a register transfer language.

A register transfer language is a system for expressing in symbolic form the micro operation sequences among the register of a digital module.

For example,

R1 ← R2

• This statement denotes a transfer of the content of register R2 into register R1.
• Here, content of R1 is replaced by content of R2.
• Content of R2 is not affected by this transfer.

If there is a condition, such that.

If (P = 1) then (R1  ← R2)

Where P is a control signal generated by the control bus. 

Above statement can be used as,

P=1: R1 ← R2

The control condition 'P=1' is terminated with a colon. It symbolizes the requirement that the transfer operation be executed by the hardware only if P= 1.

Basic symbols for Register Transfer Language
Symbol	Description	Examples
Letters & numerals	Denotes a register	MAR, R2
Parenthesis ( )	Denotes a part of a register	R2(0-7), R2(L)
Arrow ←	Denotes transfer of information	R2 ← R1
Comma ,	Separates two micro operations	R2 ← R1, R1 ← R2

For example,

T=1: R2 ← R1, R1 ← R2 

• Registers (R1, R2) are denoted by capital letters, and numerals. 
• Parentheses ( ) are used to denote a part of a register.
• The arrow (←) denotes a transfer of information and the direction of transfer.
• A comma ( , ) is used to separate two or more operations that are executed at the same time.

More topics from Computer Organization to read

Computer Organization and Architecture:

EasyExamNotes.com covered following topics in these notes.

1. Structure of desktop computers
2. Logic gates
3. Register organization
4. Bus structure
5. Addressing modes
6. Register transfer language
7. Direct mapping numericals
8. Register in Assembly Language Programming
9. Arrays in Assembly Language Programming

References:

1. William stalling ,“Computer Architecture and Organization” PHI
2. Morris Mano , “Computer System Organization ”PHI