Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1997-04-25
1999-11-09
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711110, 711 15, 345521, 365 78, 710 52, G06F 1300, G06F 1334
Patent
active
059833157
ABSTRACT:
Each of a plurality of FIFO has (1) a low region indicating a minimum number of words for FIFO storage, (2) a burst count indicating the number of words involved in each transfer to such FIFO and (3) a high region where a word count transfer into the FIFO is not initiated. However, a burst count transfer initiated before the beginning of a FIFO high region may be completed in the FIFO high region. Each FIFO is initially filled from a memory by a memory controller to the low FIFO region. Upon word transfer from each FIFO, the memory controller establishes a priority to provide an additional burst count to the FIFO low region. When the memory controller is otherwise idle and the number of words in such FIFO is in a region intermediate the FIFO low and high regions, a burst count for each FIFO may be transferred into the intermediate FIFO region. The memory controller and each FIFO respectively remember the number of words transferred into and from such FIFO. The difference between the number of words transferred into and from each FIFO indicates whether the words in such FIFO are in the low, intermediate or high region. The individual value of the number of words for each FIFO low region and the burst count for such FIFO help to establish the controller priority in transferring burst counts at any instant to such FIFO relative to burst count transfers at such instant to other FIFO.
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Fogleman Eric J.
Larky Steven P.
Chan Eddie P.
Kim Hong
Rockwell Science Center Inc.
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