G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.82
G06F 13/24 (2006.01) G06F 13/32 (2006.01)
Patent
CA 2026737
A plurality of specialized controllers, each one adapted to control a particular type of data transfer operation, control the flow of data between a system bus and a local bus on a computer adapter card. When the Direct Memory Access (DMA) controller is controlling a DMA operation on the local bus, certain other controllers can break-in to the current DMA operation, temporarily halting the DMA operation 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 are temporarily blocked by blocking signals from a break-in logic circuit. 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.
Chisholm Douglas R.
Garcia Serafin J. E. Jr.
Kalman Dean A.
Padgett Russell S.
Yoder Robert D.
International Business Machines Corporation
Saunders Raymond H.
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