Processor usable as a bus master or a bus slave

Details Processor usable as a bus master or a bus slave Processor usable as a bus master or a bus slave

1993-03-13

1994-01-11

Chun, Debra A.

Boots, shoes, and leggings

364DIG1, 3642283, 3642292, 3642304, 3642426, 36424292, G06F 1336

Patent

active

052789594

ABSTRACT:
A processor specially adapted for use as a coprocessor The processor is implemented as a microprocessor. The adaptations include the following: The microprocessor has a master-slave pin which receives an input which determines whether the microprocessor operates as a bus master or a bus slave. Certain outputs pins have three-state bus drivers which employ feedback to ensure that a signal on a line being driven by the driver has gone inactive before the driver is turned off. Instructions executed by the microprocessor permit specification of portions of the internal registers as sources and destinations and specification of the size of an ALU operation, permitting easy operation on data ranging from bytes through 24-bit pointers. Instructions are executed in an instruction pipeline and a separate I/O instruction pipeline. Some pipeline stalls are avoided by means of a special MOVE instruction which differs from an ordinary MOVE instruction in that it does not cause pipeline stall when it reads data from a register loaded by a preceding READ instruction. The microprocessor also has an Intel/Motorola pin whose input specifies the type of host processor the coprocessor is working with and further executes I/O instructions which permit the same code to be used with either host processor.

REFERENCES:
patent: 4407016 (1983-09-01), Bayliss et al.
patent: 4594654 (1986-06-01), Maniar et al.
patent: 4610013 (1986-09-01), Long et al.
patent: 4631588 (1986-12-01), Barnes et al.
patent: 4644547 (1987-02-01), Vercellotti et al.
patent: 4796256 (1989-01-01), Opderbeck et al.
patent: 4811345 (1989-03-01), Johnson
patent: 4833963 (1989-05-01), Hayden et al.
patent: 4845660 (1989-07-01), Luc et al.
patent: 4930069 (1990-05-01), Batra et al.

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