Memory Chips with Adjustable Configurations

In this paper, we present the concept of Field Programmable Memory Cell Arrays(FPMCAs) as the memory counterpart to Field Programmable Gate Arrays which haveproved their utility in design and rapid prototyping. Principles of dynamic reconfigurabilityusing programmable logic and programmable interconnect are incorporated intorandom access memories to achieve this flexibility. We first present the design of avariable width RAM (VaWiRAM) which is a simple example of a Field ProgrammableMemory Cell Array. The configuration of VaWiRAMs can be adjusted by setting a fewconfiguration pins on the memory chip. A VaWiRAM reconfigurable between widths 1 and Wmax⁡ can be constructed with the extra cost of Wmax⁡ – 1 pass gates, (Wmax⁡/2) 2-to-1multiplexers, and ⌈log⁡2[log⁡2(k) + 1]⌉ mode pins. A novel scheme to overlap the addresspins with mode control pins and achieve the mode control with only one extra pin is alsopresented. The paper discusses the architecture of the proposed VaWiRAMs in detail,analyzes the design tradeoffs and introduces the concept of FPMCAs