公开(公告)号：US5119480A

公开(公告)日：1992-06-02

申请号：US434385

申请日：1989-11-13

申请人： Serafin J. E. Garcia, Jr. ,  Douglas R. Chisholm ,  Dean A. Kalman ,  Russell S. Padgett ,  Robert D. Yoder

发明人： Serafin J. E. Garcia, Jr. ,  Douglas R. Chisholm ,  Dean A. Kalman ,  Russell S. Padgett ,  Robert D. Yoder

IPC分类号： G06F13/32 ,  G06F13/362

CPC分类号： G06F13/32

摘要： 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.