METHOD FOR ENHANCING DATA TRANSFER RATE ON BUS FOR SYNCHRONOUS DMA BURST TRANSFER BETWEEN TRANSMITTER AND RECEIVER, AND IMPROVED METHOD FOR EXECUTING SYNCHRONOUS DMA BURST TRANSFER

摘要

PROBLEM TO BE SOLVED: To execute data transfer in an enhanced data transfer rate without coming into contact with limitation on the operation of a bus interface by minimizing the data hold time for a receiver and controlling the data effective hold time for a transmitter to give the maximum setup time margin. ;SOLUTION: A PC system 10 includes a CPU 12 connected to a RAM 14 and a ROM 16 through a processor bus 18. Data transfer for each command is carried out by a series of synchronous DMA buses on a bus. In such a case, a data transfer rate for synchronous or ultra DMA transfer is enhanced by means of the control of a data effective hold time for a receiver. The combination of two hold times gives the minimum setup time margin or difference which enables the increase of a data transfer rate. When the holding time of the receiver is minimized to about 0 nanosecond and the hold time and setup time of a transmitter is reduced, the data transfer rate for synchronous DMA burst is more enhanced.;COPYRIGHT: (C)2000,JPO