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    2.
    发明专利
    未知

    公开(公告)号：DE69025268T2

    公开(公告)日：1996-08-08

    申请号：DE69025268

    申请日：1990-11-08

    Applicant: IBM

    Inventor： PADGETT RUSSELL STEPHEN ,  CHISHOLM DOUGLAS RODERICK ,  GARCIA SERAFIN JOSE ELEAZAR ,  ALVAREZ RAFAEL ,  KALMAN DEAN ALAN ,  YODER ROBERT DEAN

    IPC: G06F12/06 ,  G06F12/02 ,  G06F13/16

    Abstract: A selected address within one of two segments of a memory space (124) of a second address/data bus (116), can be accessed from a first bus (102) through one of two data registers (136 and 138). In addition, the location of the two segments within the memory space of the second bus is selectable through two segment registers (148 and 150), which are accessed from the first bus through the first data register (136). A two byte wide "mode" register (126 and 128), which can be directly accessed from the first bus, stores data within three ranges. When the mode register data is within the first range, a selected segment register can be accessed through the first data register. A first value within this range selects the first segment register (148), while a second value selects the second segment register (150). Data loaded into the first and second segment registers points to first and second segments of the second memory space, respectively. When the mode register data is within the second range, this data functions as a pointer to select an address within a selected segment. The selected address is accessed through the data registers; the first data register (136) accessing the selected address in the first segment, while the second data register (138) accesses the selected address in the second segment. After a selected address has been accessed, an auto-increment circuit increments the mode register so that the next sequential address in the selected segment can be accessed without having to reload the mode register. When the mode register data is within the third range, the two data registers can be directly accessed from the first bus.

    3.
    发明专利
    未知

    公开(公告)号：DE4035837A1

    公开(公告)日：1991-05-16

    申请号：DE4035837

    申请日：1990-11-10

    Applicant: IBM

    Inventor： CARCIA JR ,  CHISHOLM DOUGLAS RODERICK ,  KALMAN DEAN ALAN ,  PADGETT RUSSELL STEPHEN ,  YODER ROBERT DEAN

    IPC: G06F13/32 ,  G06F13/362

    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 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 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.

    BUS MASTER INTERFACE CIRCUIT WITH TRANSPARENT PREEMPTION OF A DATA TRANSFER OPERATION
    4.
    发明专利
    BUS MASTER INTERFACE CIRCUIT WITH TRANSPARENT PREEMPTION OF A DATA TRANSFER OPERATION 未知

    公开(公告)号：AU6455690A

    公开(公告)日：1991-05-16

    申请号：AU6455690

    申请日：1990-10-15

    Applicant: IBM

    Inventor： GARCIA SERAFIN JOSE ELEAZAR JR ,  CHISHOLM DOUGLAS RODERICK ,  KALMAN DEAN ALAN ,  PADGETT RUSSELL STEPHEN ,  YODER ROBERT DEAN

    IPC: G06F13/32 ,  G06F13/362 ,  G06F13/14

    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 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 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.

    Extended addressing circuitry
    7.
    发明专利
    Extended addressing circuitry 未知

    公开(公告)号：SG44428A1

    公开(公告)日：1997-12-19

    申请号：SG1996000353

    申请日：1990-11-08

    Applicant: IBM

    Inventor： PADGGETT RUSSELL STEPHEN ,  CHISHOLM DOUGLAS RODERICK ,  ELEAZAR GARCIA SERAFIN JOSE JR ,  ALVAREZ RAFAEL ,  KALMAN DEAN ALAN ,  YODER ROBERT DEAN

    IPC: G06F12/02 ,  G06F13/16 ,  G06F12/06

    Abstract: A selected address within one of two segments of a memory space (124) of a second address/data bus (116), can be accessed from a first bus (102) through one of two data registers (136 and 138). In addition, the location of the two segments within the memory space of the second bus is selectable through two segment registers (148 and 150), which are accessed from the first bus through the first data register (136). A two byte wide "mode" register (126 and 128), which can be directly accessed from the first bus, stores data within three ranges. When the mode register data is within the first range, a selected segment register can be accessed through the first data register. A first value within this range selects the first segment register (148), while a second value selects the second segment register (150). Data loaded into the first and second segment registers points to first and second segments of the second memory space, respectively. When the mode register data is within the second range, this data functions as a pointer to select an address within a selected segment. The selected address is accessed through the data registers; the first data register (136) accessing the selected address in the first segment, while the second data register (138) accesses the selected address in the second segment. After a selected address has been accessed, an auto-increment circuit increments the mode register so that the next sequential address in the selected segment can be accessed without having to reload the mode register. When the mode register data is within the third range, the two data registers can be directly accessed from the first bus.

    9.
    发明专利
    未知

    公开(公告)号：DE69025268D1

    公开(公告)日：1996-03-21

    申请号：DE69025268

    申请日：1990-11-08

    Applicant: IBM

    Inventor： PADGETT RUSSELL STEPHEN ,  CHISHOLM DOUGLAS RODERICK ,  GARCIA SERAFIN JOSE ELEAZAR ,  ALVAREZ RAFAEL ,  KALMAN DEAN ALAN ,  YODER ROBERT DEAN

    IPC: G06F12/06 ,  G06F12/02 ,  G06F13/16

    Abstract: A selected address within one of two segments of a memory space (124) of a second address/data bus (116), can be accessed from a first bus (102) through one of two data registers (136 and 138). In addition, the location of the two segments within the memory space of the second bus is selectable through two segment registers (148 and 150), which are accessed from the first bus through the first data register (136). A two byte wide "mode" register (126 and 128), which can be directly accessed from the first bus, stores data within three ranges. When the mode register data is within the first range, a selected segment register can be accessed through the first data register. A first value within this range selects the first segment register (148), while a second value selects the second segment register (150). Data loaded into the first and second segment registers points to first and second segments of the second memory space, respectively. When the mode register data is within the second range, this data functions as a pointer to select an address within a selected segment. The selected address is accessed through the data registers; the first data register (136) accessing the selected address in the first segment, while the second data register (138) accesses the selected address in the second segment. After a selected address has been accessed, an auto-increment circuit increments the mode register so that the next sequential address in the selected segment can be accessed without having to reload the mode register. When the mode register data is within the third range, the two data registers can be directly accessed from the first bus.

    Computer interface circuit
    10.
    发明专利
    Computer interface circuit 未知

    公开(公告)号：SG43722A1

    公开(公告)日：1997-11-14

    申请号：SG1996000201

    申请日：1990-11-08

    Applicant: IBM

    Inventor： GARCIA SERAFIN JOSE ELEAZAR JR ,  CHISHOLM DOUGLAS RODERICK ,  KALMAN DEAN ALAN ,  PADGETT RUSSELL STEPHEN ,  YODER ROBERT DEAN

    IPC: G06F13/32 ,  G06F13/362 ,  G06F13/30

    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 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 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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