State Machine Implementation of the Registers of a Printer Communications Module
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15
This invention relates to a state machine controlling the asynchronous access of a microprocessor to the registers of a printer communications module. Asynchronous operation means that the microprocessor and the printer communications module operate independently of each other with respect to the timing of their individual accesses to the state machine. The state machine operates as a result of the modes that the printer communications module and microprocessor are currently performing because this determines when the microprocessor can access the registers of the printer communications module. Consequently, a minimum amount of logic and other hardware are required. Referring to the figure, a state machine 1 is connected between a first microprocessor 2 and a printer communications module 3.