Dual port video memory system having semi-synchronous data input and data output
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United States of America Patent
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Dec 6, 1988
Grant Date -
N/A
app pub date -
Jan 30, 1987
filing date -
Jan 30, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual port video memory system includes a serial-to-parallel converter coupled to the input data port and a parallel-to-serial converter coupled to the output data port. Four-bit pixel values are clocked into the serial-to-parallel converter synchronous with an input clock signal and are provided by the parallel-to-serial converter synchronous with an output clock signal. The input and output clock signals may have different frequencies, but the negative-going edges of each of these clock signals are synchronized to the negative-going edges of a master clock signal.
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