公开(公告)号：IN172332B

公开(公告)日：1993-06-19

申请号：IN178DE1988

申请日：1988-08-09

Applicant: IBM

Inventor： HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO

IPC: G06F15/00

公开(公告)号：DE3782045T2

公开(公告)日：1993-04-15

申请号：DE3782045

申请日：1987-12-15

Applicant: IBM

Inventor： HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO

IPC: G06F13/28 ,  G06F13/30 ,  G06F13/36 ,  G06F13/362 ,  G06F13/374

Abstract: A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripherals, while others are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access, it transmits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is successful, the corresponding peripheral is given a DMA channel corresponding to the DMA channel assignment value with which the comparison was successful.

公开(公告)号：HK33692A

公开(公告)日：1992-05-15

申请号：HK33692

申请日：1992-05-07

Applicant: IBM

Inventor： HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO

IPC: G06F13/28 ,  G06F13/30 ,  G06F13/36 ,  G06F13/362 ,  G06F13/374

Abstract: A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripherals, while others are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access, it transmits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is successful, the corresponding peripheral is given a DMA channel corresponding to the DMA channel assignment value with which the comparison was successful.

公开(公告)号：GB2202975B

公开(公告)日：1991-09-25

申请号：GB8728921

申请日：1987-12-10

Applicant: IBM

Inventor： CONCILIO IAN ANTHONY ,  HAWTHORNE JEFFREY ALAN ,  HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO ,  NGUYEN LONG DUY

IPC: G06F13/30 ,  G06F13/28 ,  G06F13/36 ,  G06F13/362 ,  G06F13/374

Abstract: A computer system is coupled to peripherals having their own DMA channel arbiter and peripherals having no arbiter. A separate arbitration unit, controlled directly by the CPU, is provided to arbitrate on behalf of peripherals having no arbiter. The CPU can thus freely assign different arbitration levels to such peripherals, and can instruct the arbitration unit to simultaneously arbitrate on different arbitration levels or for two or more DMA channels.

公开(公告)号：GB2202977B

公开(公告)日：1991-07-24

申请号：GB8728927

申请日：1987-12-10

Applicant: IBM

Inventor： HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO

IPC: G06F13/28 ,  G06F13/30 ,  G06F13/36 ,  G06F13/362 ,  G06F13/374

Abstract: A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripherals, while others are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access, it transmits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is successful, the corresponding peripheral is given a DMA channel corresponding to the DMA channel assignment value with which the comparison was successful.

公开(公告)号：DE3810231A1

公开(公告)日：1988-10-06

申请号：DE3810231

申请日：1988-03-25

Applicant: IBM

Inventor： HEATH CHESTER ASBURY ,  LENTA JORGE EDUARDO

IPC: G06F13/28 ,  G06F13/30 ,  G06F13/36 ,  G06F13/362 ,  G06F13/374 ,  G06F13/10 ,  G06F13/20

Abstract: A computer system in which peripherals greater in number than the number of DMA channels provided in the system can all have DMA access. Some of the DMA channels are dedicated to certain ones of the peripherals, while others are shared by remaining ones of the peripherals. Each peripheral having DMA access has a channel priority value. When a peripheral wants DMA access, it transmits its channel priority value onto an arbitration bus. The winning channel priority value is then compared with prestored DMA channel assignment values. If the comparison is successful, the corresponding peripheral is given a DMA channel corresponding to the DMA channel assignment value with which the comparison was successful.