Boots – shoes – and leggings
Patent
1991-11-19
1996-08-27
Lee, Thomas C.
Boots, shoes, and leggings
36424691, 3642384, 3642423, 364DIG1, 395848, G06F 1200
Patent
active
055510540
ABSTRACT:
According to the principles of this invention, a disk drive includes a page mode buffer memory controller that is used to control transfer of data from and to a buffer memory. The page mode buffer memory controller transfers a page of Nb data bytes from the buffer memory to a host of the disk drive if the data transfer is not interrupted by another request to the page mode buffer memory controller. The transfer of Nb data bytes requires only four overhead clock cycles. The page mode buffer memory controller includes a buffer prioritizer, a memory sequencer, a disk FIFO circuit, a refresh counter, a buffer address generator, and a disk byte counter. The buffer prioritizer receives request signals on port input lines and generates control output signals to the memory sequencer, disk byte counter and buffer address generator. The refresh counter repetitively loads itself with a refresh time period, that is stored in a register, for refreshing the buffer memory. After the refresh counter is loaded, the counter counts down and generates a refresh request at the end of each refresh time period. The memory sequencer includes a state machine that generates control signals for the buffer memory as well as control signals for the buffer address generator and disk byte counter. The buffer address generator generates the addresses for the locating in the buffer memory that are used in the data transfer.
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Adaptec, Inc.
Kim Sang Hui
Lee Thomas C.
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