Boots – shoes – and leggings
Patent
1994-02-16
1995-02-07
Harvey, Jack B.
Boots, shoes, and leggings
364948, 3649579, 395250, G06F 1134
Patent
active
053882474
ABSTRACT:
A read buffering system employs a bank of FIFOs to hold sequential read data for a number of data streams being fetched by a computer. The FIFOs are located in the memory controller, so the system bus is not used in memory accesses used to fill the stream buffer. The system stores addresses used for read requests made by a CPU, and if a next sequential address is then detected in a subsequent read request, this is designated to be a stream (i.e., sequential reads). When a stream is thus detected, data is fetched from DRAM memory for addresses following the sequential address, and this prefetched data is stored in one of the FIFOs. The system also prevents the unnecessary prefetching of data by preventing certain CPU requests from being used to detect streams. A FIFO is selected using a least-recently-used algorithm. When the CPU subsequently makes a read request for data in a FIFO, this data can be returned without making a memory access. By taking advantage of page mode, access to the DRAM memory for the prefetch operations can be transparent to the CPU, resulting in substantial performance improvement if sequential accesses are frequent. The data is stored in the DRAMs with ECC check bits, and error detection and correction (EDC) is performed on the read data downstream of the stream buffer, so the stream buffer is protected by EDC.
REFERENCES:
patent: 3840863 (1974-10-01), Fuqua et al.
patent: 4159532 (1979-06-01), Getson, Jr. et al.
patent: 4499576 (1985-02-01), Fraser
patent: 4853840 (1989-08-01), Shibuya
patent: 4980823 (1990-12-01), Liu
patent: 4989135 (1991-01-01), Miki
patent: 5168557 (1992-12-01), Shibuya
patent: 5251310 (1993-10-01), Smelser et al.
patent: 5261066 (1993-11-01), Jouppi et al.
patent: 5265236 (1993-11-01), Mehring et al.
Goodwin Paul M.
Maskas Barry A.
Thaller Kurt M.
Cefalo Albert P.
Digital Equipment Corporation
Harvey Jack B.
Hudgens Ronald C.
Tall Michael H.
LandOfFree
History buffer control to reduce unnecessary allocations in a me does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with History buffer control to reduce unnecessary allocations in a me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and History buffer control to reduce unnecessary allocations in a me will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1117263