Mappable peripheral memory for high speed applications

Abstract
A 30-ns mappable peripheral memory subsystem called MAP, is described. The MAP significantly enhances system performance by integrating, on the same chip, a 128-kb EPROM for program storage, a SRAM for data storage, and a programmable mapping decoder (PMD) for address decoding and mapping. The PMD is integrated into the memory-decode logic without adding up the access time. The decoder facilitates address mapping within a 2-Mb address space. The MAP is ideally suited as an expansion peripheral memory for high-speed digital signal processors, microprocessors, and microcontrollers. The 290-mil-sq. chip is implemented in a 1.2- mu m CMOS EPROM process.<>

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