Port select unit for a programmable serial-bit microprocessor

Details Port select unit for a programmable serial-bit microprocessor Port select unit for a programmable serial-bit microprocessor

1974-09-04

1979-12-04

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 304

Patent

active

041775112

ABSTRACT:
An apparatus and method for selecting the operation of digital data ports for regulating information flow between a programmable serial-bit, microinstruction processor and a multiplicity of peripheral devices connected to the processor is provided by a control pulse distribution circuit operating in conjunction with a controllable decoder circuit. Peripheral device designation instructions which may be available from the processor may define which of the ports will function, i.e., be "open", within the current processor cycle to enable communications between the processor and a device connected thereto. These designation instructions may be decoded to produce enabling signals for controlling the distribution of the timing and other associated pulses needed for the activation of a port. Operation of the selection apparatus may be as to permit data flow during a specified portion of each processor cycle.

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