Robert C Yoder

51194805, Jun 2, 1992

Nov 13, 1989

7/434385

Serafin J. E. Garcia - Boynton Beach FL
Douglas R. Chisholm - Chatelaine FL
Dean A. Kalman - Lantana FL
Russell S. Padgett - Royal Palm Beach FL
Robert D. Yoder - Delray Beach FL

International Business Machines Corporation - Armonk NY

G06F 1332

395325

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.