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Title: Port select unit for a programmable serial-bit microprocessor

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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Inventors: Taddei, Vincent J. (West Chester, PA, US)

Application Number: 503111
Filing Date: 1974-09-04
Publication_date: 1979-12-04
Assignee: Burroughs Corporation (Detroit, MI)
Primary Class(es): 710/37
Other Classes:
US Patent Ref:
3331055Jul, 1967Betz et al.340/172.
3353156Nov, 1967Ehrman340/172.
3417374Dec, 1968Pariser364/200.
3465298Sep, 1969LaDuke et al.340/172.
3500466Mar, 1970Carleton340/172.
3639909Feb, 1972Hauck et al.364/200.
3693161Sep, 1972Price et al.364/200.
3708785Jan, 1973Rawson et al.364/200.
3728693Apr, 1973Macker et al.364/200.
3740728Jun, 1973Pallen364/200.
3745532Jul, 1973Erwin364/200.
3749845Jul, 1973Fraser340/172.
3763472Oct, 1973Sharp364/200.
3771134Nov, 1973Huettner et al.340/172.
3878514Apr, 1975Faber340/172.
3959775May, 1976Valassis et al.364/200.
4020472Apr, 1977Bennett et al.364/200.

Other Refs:
Primary Examiner: Shaw, Gareth D.
Assistant Examiner: Heckler, Thomas M.
Attorney: Chung; Edmund M., Starr; Mark T., Peterson; Kevin R.