The Register Transfer Language is the symbolic representation of notations used to specify the sequence of micro-operations.
In a computer system, data transfer takes place between processor registers and memory and between processor registers and input-output systems. These data transfer can be represented by standard notations given below:
- Notations R0, R1, R2..., and so on represent processor registers.
- The addresses of memory locations are represented by names such as LOC, PLACE, MEM, etc.
- Input-output registers are represented by names such as DATA IN, DATA OUT and so on.
- The content of register or memory location is denoted by placing square brackets around the name of the register or memory location.
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 |
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