Efficient MSI Partitioning for a Digital Computer

An efficient partitioning scheme based on current capability of MOS MSI technology was evolved in which four functional building blocks were defined for implementing computer digital architecture. The partitioning employs a bit slice concept to define registers and a universal logic gate for general twoor three-variable logic. A look-ahead carry for fast arithmetic and a heavily buffered OR gate structure for the control section complete the partitioning elements. Microsequencing for instruction decoding is accomplished with a state graph implemented with register FBB flip-flops. A stored program aerospace computer implemented with the FBB structures is briefly described, with a detailed example of FBB application. Basic FBB circuit structures and clocking techniques are also discussed.