Boots – shoes – and leggings
Patent
1991-12-30
1995-01-31
Dixon, Joseph L.
Boots, shoes, and leggings
364DIG1, 3642448, 3642464, 3649113, G06F 1208, G06F 1300
Patent
active
053865324
ABSTRACT:
A method and apparatus for supporting multiple DMA channels by splitting data transfers for each channel into sequences of data slices and interleaving on a slice-by-slice basis. While the control of transfer resources may be shifted among the DMA channels, the ordering of the data slices for each channel is preserved. The present invention also discloses a circuit architecture capable of supporting the multiple interleaving DMA channels. The circuit architecture comprises a dual-port memory, channel sequencer, and channel interleave control. The dual-port memory stores slices of data to be transferred through the channels. A channel sequencer maintains the channel ordering of data slices in the dual-port memory. A channel interleave control unit allows channels to interleave their data transfers by monitoring the channel interleave size, current data transfer count and total transfer count per channel. A second channel is allowed to transfer data through the same medium as a first channel either when the first channel has reached its channel interleave size, or when the first channel has transferred its requested total transfer count, thus providing efficient bus utilization.
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IBM Technical Disclosure Bulletin, vol. 32, No. 8A High Speed Buffer for N.times.1 Packet Multiplexing, Jan. 1990, New York, U.S.A.
Dixon Joseph L.
Elmore Reba I.
Sun Microsystems Inc.
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