Coprocessor having a slave processor capable of checking address

Details Coprocessor having a slave processor capable of checking address Coprocessor having a slave processor capable of checking address

1986-12-29

1990-07-17

Harkcom, Gary V.

Boots, shoes, and leggings

3642304, 3642286, G06F 1516, G06F 1300

Patent

active

049425196

ABSTRACT:
A coprocessor device having a virtual storage system comprises a master microprocessor, a slave microprocessor controlled by the master microprocessor to execute an operation designated by instructions for the slave microprocessor, a main storage for storing information and data for the master microprocessor and the slave microprocessor, and an external storage coupled to the main storage for storing information and data for the master microprocessor and/or the slave microprocessor. The master microprocessor has a circuit for detecting whether or not the memory location required by a certain instruction is physically present in the main storage. This detecting circuit operates to enable access to the main storage or to generate an interrupt to transfer information and/or data from the external storage to the main storage, in accordance with the content of the instruction. There is also provided a circuit for feedbacking to the master microprocessor the decoded instruction for the slave microprocessor which includes address which is not physically present in the main storage, so that it is processed by the detecting circuit.

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