In the image display and control system, a high speed dissymmetrical point to point communication port and protocol between GENIC(Gigabit Ethernet Network Interface Card) and SDRAM based on LVDS (Low Voltage Differential signaling) and STOP-WAIT ARQ protocol are designed, while the port’s speed should not below 1Gbps. Five lines LVDS signal pairs are used in one direction, including one clock and four data in the port’s electrical connections. Double-edge sampling and source synchronizing are also used. Mode 256 checkout is used to guarantee the reliable data transmission. Analysis shows that the port’s bandwidth is 1.2Gbps, the efficiency of protocol is above 99% and the protocol works steadily and reliably.
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