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Chapter 11 ½ Microprogramming and the Design of the Control Circuits in a Electronic Digital Computer 163

 

an asynchronous arithmetical unit every gate requires only one kind of wave-form to operate it and the timing of that wave-form is not critical. In a serial machine, on the other hand, different gates require different wave-forms and the same gate may require different wave-forms at different times; further, all these wave forms must he critically timed. These complications may be handled by including in the micro-control unit a third matrix, C, for selecting the appropriate wave-form for each micro-order. The main wave-form, routed by the decoding tree and matrix A, opens a gate which is fed by a wave-form selected by matrix C. This enables a wave-form of correct duration to be applied to any selected gate in the arithmetical or control sections of the machine.


References

Wilkes and Stringer [1953]; Boutwell and Hoskinson [1963]; Flynn and MacLaren [1967]; Green [1966]; Greene, Dean, and Updike [1964]; Mercer [1957]; Patzer and Vandling [1967]; Rosin [1969]; Tucker [1967]; Weber [1967]; Wilkes [1951]; Wilkes [1958].

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