Partitioning Microcode for a Microprocessor Based Mainframe by Placing Least Frequently used Vertical Microwords Off-Chip
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-09
Current microprocessors achieve excellent cost/performance by allowing a single chip to contain both the control store and the data flow that it controls. Their cost/performance is further improved if the control store is wide or "horizontal", rather than narrow or "vertical". A wide control store eliminates most decoding, so it reduces both complexity and propagation delay. However, a wide control store must contain more bits than a narrow one, to implement a given function.