Patent
1997-09-11
1999-05-18
Robertson, David L.
G06F13/00
Patent
active
059059117
ABSTRACT:
A data transfer system which improves efficiency in direct data transfer from an input device with a first-in first-out (FIFO) memory serving as a buffer to a memory and from a memory to an output device with a first-in first-out (FIFO) memory serving as a buffer. The data is transferred from the input device to the memory and from the memory to the output device by meeting the requirement of address alignment without restricting data transfer to fixed multiples of, for example, four words. A memory write controller is informed as to how much data is present in the buffer in the input device. The controller checks memory address alignment to determine the transfer size of data from the input device to the memory. A memory read controller is also informed as to how much free space is present in the buffer in the output device and checks the memory address alignment to determine the transfer size of data from the memory to the output device. The request lines from the input device are used to indicate that data in the FIFO is either one word or more, two words or more or four words or more. A maximum data transfer size is determined automatically from an amount of data stored in the buffer of the input device and a check on memory address alignment.
REFERENCES:
patent: 4346439 (1982-08-01), Huno et al.
patent: 4471427 (1984-09-01), Harris
patent: 4797851 (1989-01-01), Suzuki
patent: 5062073 (1991-10-01), Masuda et al.
patent: 5170477 (1992-12-01), Potter et al.
Fujitsu Limited
Robertson David L.
LandOfFree
Data transfer system which determines a size of data being trans 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 system which determines a size of data being trans, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data transfer system which determines a size of data being trans will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1768472