Electrical computers and digital data processing systems: input/ – Interrupt processing
Patent
1997-05-02
1999-08-03
Sheikh, Ayaz R.
Electrical computers and digital data processing systems: input/
Interrupt processing
710 1, 710 5, 710 6, 710 20, 710 59, 369 32, 369 47, 369 48, 369 54, 369124, 360 32, G06F 946
Patent
active
059319348
ABSTRACT:
A data processing device 100 uses a portion of a random access memory 111 as an input buffer for holding a portion of a stream of data which is received by an input interface 130. Likewise, a portion of a memory 121 is used as an output buffer for holding a portion of processed data which is output by an output interface 140. A processing unit 110 within the processing device manages the flow of input and output data. The input interface asserts an I/O request 860 when it receives a data word, and the output interface asserts an I/O request 870 when it needs a data word. In response to an I/O request, fast interrupt circuitry inserts a ghost instruction which is formed by doppelganger circuitry into an instruction sequence which is being accessed from a ROM 112. The ghost instruction performs the requested data transfer.
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Li Stephen (Hsiao Yi)
Ng Fuk Ho Pius
Rowlands Jonathan
Donaldson Richard L.
Jean Frantz Blanchard
Laws Gerald E.
Marshall, Jr. Robert D.
Sheikh Ayaz R.
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