Abstract: Memory access time, noise and costs are substantially reduced while reliability is increased by replacing fixed delay lines with a dynamic delay. This dynamic delay is placed on the same integrated circuit as the remainder of the memory access circuitry to eliminate tracking problems associated with off-chip delay lines. The dynamic delay element is activated after all of the row address strobe (RAS) bits have been generated. These RAS bits serve to strobe the row column address bits initially present on the address bus into the memory. After the delay time has elapsed an address multiplexor switches column address bits onto the address bus to replace the prior row address bits. As soon as this switch is completed column address strobe (CAS) bits are generated to strobe the column address bits into the memory.

Abstract: A multi-stage, multi-function, arithmetic and logic unit for a data processing system is formed with only a small number of components. Some of the functions (Sum and Exclusive OR) are performed within each stage. For other functions (AND and OR), some of the components of one stage cooperate with different components of the next stage in an arrangement that reduces the total number of components for each stage. For these functions, the output appears shifted one bit position to the left and is then re-shifted one bit position to the right by a conventionally available shifter.