INTRODUCTION - MICROPROGRAMMED CONTROL

Control Memory


Sequencing Microinstructions

Microprogram Example

Design of Control Unit

Microinstruction Format

Nanostorage and Nanoprogram

Microprogram
- Program stored in memory that generates all the control signals required
to execute the instruction set correctly
- Consists of microinstructions

Microinstruction
- Contains a control word and a sequencing word
Control Word - All the control information required for one clock cycle
Sequencing Word - Information needed to decide
the next microinstruction address
- Vocabulary to write a microprogram



Control Memory(Control Storage: CS)
- Storage in the microprogrammed control unit to store the microprogram

Writeable Control Memory(Writeable Control Storage:WCS)
- CS whose contents can be modified
-> Allows the microprogram can be changed
-> Instruction set can be changed or modified


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