公开(公告)号：DE69027515T2

公开(公告)日：1997-01-23

申请号：DE69027515

申请日：1990-12-07

Applicant: IBM

Inventor： RILEY MACK WAYNE ,  UPTON JOHN DANIEL

IPC: G06F13/12 ,  G06F13/30 ,  G06F13/362 ,  G06F13/38 ,  G06F13/36

Abstract: A data processing system includES an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.

公开(公告)号：HK203096A

公开(公告)日：1996-11-15

申请号：HK203096

申请日：1996-11-07

Applicant: IBM

Inventor： RILEY MACK WAYNE ,  UPTON JOHN DANIEL

IPC: G06F13/12 ,  G06F13/30 ,  G06F13/362 ,  G06F13/38 ,  G06F13/36

Abstract: A data processing system includES an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.

公开(公告)号：DE69724544D1

公开(公告)日：2003-10-09

申请号：DE69724544

申请日：1997-09-22

Applicant: IBM

Inventor： KELLY RICHARD ALLEN ,  NEAL DANNY MARVIN ,  PEREZ MICHAEL ANTHONY ,  ROBERTSON PAUL GORDON ,  TAMARISA PADMAVATHY ,  UPTON JOHN DANIEL

IPC: G06F13/40

公开(公告)号：SG43719A1

公开(公告)日：1997-11-14

申请号：SG1996000147

申请日：1990-12-07

Applicant: IBM

Inventor： RILEY MACK WAYNE ,  UPTON JOHN DANIEL

IPC: G06F13/30 ,  G06F13/362 ,  G06F13/38 ,  G06F13/12 ,  G06F13/36

Abstract: A data processing system includES an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.

公开(公告)号：DE69027515D1

公开(公告)日：1996-07-25

申请号：DE69027515

申请日：1990-12-07

Applicant: IBM

Inventor： RILEY MACK WAYNE ,  UPTON JOHN DANIEL

IPC: G06F13/12 ,  G06F13/30 ,  G06F13/362 ,  G06F13/38 ,  G06F13/36

Abstract: A data processing system includES an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.

公开(公告)号：AU6661090A

公开(公告)日：1991-06-20

申请号：AU6661090

申请日：1990-11-15

Applicant: IBM

Inventor： RILEY MACK WAYNE ,  UPTON JOHN DANIEL

IPC: G06F13/12 ,  G06F13/30 ,  G06F13/362 ,  G06F13/38 ,  G06F13/20 ,  G06F13/14

Abstract: A data processing system includES an arrangement for modifying the usual priority arbitration of an input/output channel controller (IOCC) used in granting direct memory access (DMA) service among contending peripheral devices sharing a common peripheral bus. The IOCC includes logic for conditioning the established priority arbitration scheme based upon the data status of the data buffers. If the higher priority requesting device requires a data transfer between the system memory and the IOCC prior to performing an operation directly between the IOCC and the peripheral device, the priority will instead be granted to a lower priority peripheral device that does not require a system memory access operation.