Speculative direct memory access transfer between slave devices

Details Speculative direct memory access transfer between slave devices Speculative direct memory access transfer between slave devices

1998-03-16

2000-04-04

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710 25, 711118, 711167, G06F 1328

Patent

active

060473363

ABSTRACT:
A DMA Controller, in response to a data transfer request from a slave device, initiates a memory transfer cycle and informs the slave device when the data transfer has completed. In order to avoid dead clock cycles on internal bus(es), the DMA Controller initiates a speculative data transfer cycle after the notification. The DMA Controller aborts the speculative data transfer cycle if the slave device does not request another data transfer within a predetermined time.

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IBM Technical Disclosure Bulletin, V27, #5, Oct. 1994 "Interfacing of Slow Direct Memory Access and Peripheral Devices to a High Speed Bus".

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