Boots – shoes – and leggings
Patent
1989-11-13
1992-06-02
MacDonald, Allen R.
Boots, shoes, and leggings
3642412, 3642413, 3642423, 36424231, 36424232, 3642426, 364941, 3649411, G06F 1332
Patent
active
051194805
ABSTRACT:
A plurality of specialized controllers (e.g., 202, 204 & 206), each one adapted to control a particular type of data transfer operation, control the flow of data between a system bus (104) and a local bus (106) on a computer adapter card (102). When the Direct Memory Access (DMA) controller (202) is controlling a DMA operation on the local bus, certain other controllers (204 & 206) can break-in to the current DMA operation, temporarily halting the DMA opertion until the other controller has completed its data transfer operation. To break-in to a DMA operation, handshaking signals between the DMA controller and the local bus interface circuit (212) are temporarily blocked by blocking signals from a break-in logic circuit (210). The break-in circuit includes a four-state state machine to block the handshaking signals at the appropriate times, and to signal the interrupting controller to begin its data transfer operation. When breaking-in to a DMA operation in this manner, the operation of the DMA controller is not altered; instead, to the DMA controller, it appears that the local bus interface circuit is merely slow to respond with its acknowledge handshake.
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Chisholm Douglas R.
Garcia, Jr. Serafin J. E.
Kalman Dean A.
Padgett Russell S.
Yoder Robert D.
Hauser Robert S.
International Business Machines - Corporation
MacDonald Allen R.
McKinley Martin J.
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