Apparatus for carrying out asynchronous communication among inte

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3642295, 3642305, 3642314, 3642378, 3642379, 3642397, 3642401, 3642705, 3642709, 3642749, 3642766, 364DIG1, 364DIG2, 395 21, G06F 305, G06F 1322, G06F 1320, G06F 1542

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054045568

ABSTRACT:
An apparatus for carrying out asynchronous communication among integrated circuits for inter-chip communications includes a plurality of senders disposed on an integrated circuit. Each is associated with send-initiate circuitry to indicate a request to send the occurrence of an event. The occurrence of an event causes the sender to transition from a no-event-occurred state to an event-occurred state. An address-generating circuit for generating a unique address is associated with each sender. The send-initiate circuitry of each sender is connected to an arbiter circuit. The arbiter circuit resolves simultaneous requests to send by more than one sender and provides a send-enable signal to the winning contending sender. The send-enable signal resets the selected sender to its no-event-occurred state. The send-enable signal causes the address-generating circuit associated with the winning contending sender to generate the address of that sender and place it on an output bus along with an output-enable signal. An acknowledge signal from a receiver resets the request-to-send signals from all send-initiate circuits. All other senders which reported an event and were not selected by the arbiter circuit remain in their event-occurred states. After the acknowledge signal, other pending events may be transmitted and the arbiter circuit again selects a sender from among any contenders.

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