Data transfer control system determining a start of a direct mem

Details Data transfer control system determining a start of a direct mem Data transfer control system determining a start of a direct mem

1998-08-03

2000-09-12

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

710 17, 710 18, 710 22, 710 23, 710 28, 710 29, 710 34, 710 39, 710 40, 710 52, 710 56, 710 60, 710 62, 710107, 710112, 710119, 710123, 710129, 700 4, 700 5, 370232, G06F 1328, G06F 1330, G06F 13368

Patent

active

061191760

ABSTRACT:
It is determined that, when starting of direct memory access is newly requested, whether or not the direct memory access can be started, using a rate of using the bus at the present time by data transfer performed by all the direct memory access controllers which have already started direct memory access until then and all the processors, a data transfer rate needed by the newly requested direct memory access, a size of data which is transferred in one direct memory access operation or a size of data which a memory can accept, a latency for accessing the memory, and a latency for bus-right arbitration. The newly requested direct memory access is started when it is determined that the direct memory access can be started. Starting of the newly requested direct memory access is kept waiting when it is determined that the direct memory access cannot be started. The newly requested direct memory access, which has been kept waiting, is started when any direct memory access which has already been carried out finishes, and enough capacity is free in the common bus for carrying out the newly requested direct memory access.

REFERENCES:
patent: 4987529 (1991-01-01), Craft et al.
patent: 5400329 (1995-03-01), Tokura et al.
patent: 5446733 (1995-08-01), Tsuruoka
patent: 5533205 (1996-07-01), Blackledge Jr. et al.
patent: 5630172 (1997-05-01), Ami et al.
patent: 6006270 (1999-12-01), Kobunaya
patent: 6038620 (2000-03-01), Yanes et al.

Affiliated with

Also associated with

Rating

Data transfer control system determining a start of a direct mem does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Data transfer control system determining a start of a direct mem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transfer control system determining a start of a direct mem will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-105683