Register Transfer Language
A digital system Is an interconnection of digital hardware module. that accompalish a specific Wormation-proceaslna taslc. Digital systems vary in size and complexi.ty interacting digital &om a few integrated circuits to a complex of interconnected and computers. Digital system design invariably Uses a modular approach. The modules are constructed &om such digital components as ules registet&, are in decoders, terconnected arithmetic with common elements data and control paths , and control logic. The to fonn various moda digital computer system.
Digital modules are best defined by the registet& they contain and the operations executed that are performed on the data stored in them. The operations on data stored in reglstet& are called miaooperations. A mlaooperation is an elementaxy operation perfonned on the infonNtion stored in one or infonNition more registers. The result of the operation may replace the previous binary of a register or may be tnmsferred to another register. Examples of ponents mlcrooperations introduced are in Chap. shift, count, 2 are registet& clear, and load. that implement Some of microoperations. the digital comFor example, a counter with parallel load is capable of performing the moperations increment and load. A bidirectional shift register is capable of performing the shift right and shift left microoperations.
The internal hardware organization of a digital computer is best defined by specifying:
1. The set of registers it contains and their function.
2. The sequence of microoperations performed on the binary information stored in the registers.
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3. The control that initiates the sequence of microoperations.
It is possible to specify the sequence of microoperations in a computer by explaining every operation in words, but this procedure usually involves a lengthy descriptive explanation. It is more convenient to adopt a suitable symbology to describe the sequence of transfers between registers and the various arithmetic and logic microoperations associated with the transfers. The use of symbols instead of a narrative explanation provides an organized and concise manner for listing the microoperation sequences in registers and the control functions that initiate them.