SIMULATION EQUIPMENT FOR SERIAL TRANSMISSION

摘要

PURPOSE:To attain high speed continuous transmission of a data having an optional bit length by extracting a parallel data directly from a data memory without intervention of muP and providing a memory storing bit length information of transmission data without intervention of a microprocessor. CONSTITUTION:A data memory 5 stores a transmission data DT1 for serial transmission line output at each storage area. A most significant bit location memory 6 stores a bit location data DT2 representing the effective bit length of the transmission data DT1 at each address in the data memory 5. A selector 7 inputs a bit location count 11a and selects one by one bit sequentially and serially from the parallel transmission data DT1 outputted from the data memory 5. A driver 9 applies level conversion to the output of the selector 7 and sends the result to a serial transmission line SL as a driver output 9a. The most significant bit location memory 6 is provided in this way to send the data of an optional bit length from the storage area at each address in the data memory 5 and this system is useful for the simulation of a transmission protocol whose bit length is not fixed.