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Q. Illustrate Cache DRAM?
Cache DRAM (CDRAM) which is developed by Mitsubishi integrates a tiny SRAM cache (16Kb) on a generic DRAM chip. SRAM on the CDRAM can be used in two ways. First it can be used like true cache comprising of a number of 64-bit line. Cache mode of CDRAM is effective for ordinary random access to memory.
SRAM on CDRAM can also be used like a buffer to support serial access of a block of data. For illustration to refresh a bit-mapped screen CDRAM can prefetch the data from DRAM into SRAM buffer. Following accesses to chip may result in accesses solely to SRAM.
Illustrate how 74147 series TTL can be used as a decimal-to-BCD encoder. Ans. Available IC in 74 series is 74147 that is a priority encoder. Such IC has active low inp
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