System and method for providing an improved synchronous operation of an advanced peripheral bus with backward compatibility

Abstract

An electronic bridge for providing a first electronic device attached to a high-data throughput bus and a second electronic device attached to a peripheral bus. The bridge further has an output bus circuit for generating output bus signals onto the peripheral bus, the output bus comprising a peripheral data bus a peripheral address bus. The bridge also has an output size signal circuit for generating output size signals for indicating the number of bits being used for a data transfer over the peripheral data bus, and an output control signal circuit for generating a output control signals onto the peripheral bus. The plurality of output control signals comprise, a PWRITE write control signal for indicating whether a write operation is occurring, a continuous PCLK clock signal having a rising edge and a falling edge for controlling the transfer of data over the lower-speed peripheral bus, and one or more PSELx signals for indicating the particular cycle of the PCLK signal in which data is to be transferred over the lower-speed peripheral bus. A corresponding slave apparatus for transferring digital data from a first electronic device attached to a high-data throughput bus through an electronic bridging device to a lower-speed peripheral bus. The slave apparatus has an input bus for receiving a plurality of output bus signals from the peripheral bus, an input size signal circuit for receiving output size signals for indicating the number of bits being used for a data transfer over the peripheral data bus, and an input control signal circuit for receiving input control signals from the peripheral bus.