Importance

Loading Importance Indicators...

Abstract

A dual port random access memory cell is coupled to complementary read/write data bit lines, a read-only data bit line, a read/write address line and a read-only address line. The memory cell includes two two-transistor inverters (36, 38) cross-coupled to form a flip-flop core memory which is coupled to complementary input/output nodes (40, 42). A fifth transistor (44 or 56) has its main electrodes connected between the first input/output node (40) and the first read/write data bit line (BLA) and its gate electrode connected to the read/write address line (ROW SELA or ROW SELA). The sixth transistor (46 or 58) has its main electrodes connected between the second input/output node (42) and the second read/write data bit line (BLA) and its gate electrode connected to the read/write address line (ROW SELA or ROW SELA). A seventh transistor (48) has its main electrodes connected between an upper power supply potential (VCC) and a common node (54) and has its gate electrode connected to the second input/output node (42). An eighth transistor (50 ) has its main electrodes connected between the common node (54) and a lower power supply potential (VSS) and its gate electrode connected to the first input/output node (40). A ninth transistor (52) has its main electrodes connected between the common node (54) and the read-only date bit line (BLB) and its gate electrode connected to the read-only address line (ROW SELB).

Loading the Abstract Image...

First Claim