System using DMA and descriptor for implementing peripheral devi

Details System using DMA and descriptor for implementing peripheral devi System using DMA and descriptor for implementing peripheral devi

Filed on

1996-04-08

Date issued

1998-06-30

Examiner

Asta, Frank J.

Other Related Categories

395842, 395848, 395308, G06F 1300

Type

Patent

Status

active

Patent number

057747440

Description

ABSTRACT:
The present invention relates to a system and method for implementing peripheral device bus mastering in a mobile computer system. The system uses the mobile computer system's microcontroller for programming a DMA controller, generating and sending command signals, and receiving completion status after transfer of data is complete. The micro-controller accesses a data buffer descriptor list. The data buffer descriptor list describes each data transfer that the micro-controller initiates, controls, and completes. The Direct Memory Access controller which is programmed by the micro-controller transfers data to and from a memory section of the mobile computer system. A bus controller is used for implementing a memory data transfer request from the DMA controller means and the micro-controller means. A device controller such as a Universal Serial Bus (USB) controller or an Infrared Data Association (IrDA) controller is used for receiving and responding to command signals from the micro-controller, transferring data to and from the DMA controller, and generating and returning a completion status to the micro-controller after the transfer of data is complete.

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patent: 5613162 (1997-03-01), Kabenjian
patent: 5619728 (1997-04-01), Jones et al.
patent: 5621902 (1997-04-01), Cases et al.

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