LectureNotesPartThree

LectureNotesPartThree - Lecture Notes Section Three An...

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Lecture Notes Section Three : An external architecture is realized by mechanisms implemented in hardware and (in microprogrammed systems) microcode or firmware. We can describe these mechanisms at many levels ranging from register transfer level --- registers, busses, ALU’s, etc. downto individual gates or transistors. Usually we don’t want all of this information. So we abstract this to a description of the internal organization of the computer called its internal architecture. Fig 3.1 The internal architecture of a computer is described by: Capabilities and performance characteristics of its principle functional components. The ways in which these components are interconnected The nature of information flow between components The logic and means by which such information flow is controlled. A description of the internal. architecture is needed to improve the understandibility of a design … helpful to both the reader and designer. There is a very special case of internal architecture involving machines which are microprogrammed and user-microprogrammed. In these cases, the internal architecture must be specified at a level of detail sufficient for the microprogrammer to write and implement the microcode for these machines.
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