Micro-program sequencing is the process of determining the next address in a control memory during the execution of micro-instructions. This sequencing is managed by a component known as a micro-program sequencer.
- Role of Micro-Program Sequencer:
- The micro-program sequencer is a component connected to the control memory.
- It reads specific bits from the current micro-instruction to decide the next address for the control memory.
- Functions of a Typical Sequencer:
- Increment Address: It can simply move to the next address in the control memory.
- Branching: Jumps to an address specified by the micro-instruction’s address field.
- Conditional Branching: Jumps to a specified address only if a particular status bit is equal to 1.
- External Transfer: Transfers control to a new address as specified by an external source, like the Instruction Register.
- Subroutine Calls and Returns: Supports the execution of subroutines with the ability to return to the main program.
- Address Generation Based on Micro-Instruction and Conditions:
- The micro-program sequencer generates the next control memory address based on the current micro-instruction and the conditions set by flags and the contents of the Instruction Register.
- For example, depending on certain conditions or flags, the sequencer might decide to branch to a specific address, increment the current address, or transfer control to an external source.
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