colorlight 5A-75B( 8 HUB75 ports), 5A-75E(16HUB75 ports) based on lattice semi ECP5-25F, used as LED Panel 卡萊特接收卡( meaning LED panel controller), These are known as a "Receiver Card". Its main function is to receive and forward framebuffer data using a proprietary protocol (from a "Sender Card") and send out control signals to LED panels (via shields, like a HUB75 shield). This 5A-75 receiver card has been out for a few years, and getting less popular now. Usually The system consists of 2 parts, one is sending part made up of sending card; and receiving part made up of receiving cards. There is 2 kinds of control systems, one is Synchronous control system, the other is asynchronous. Widely used Synchronous control cards are Linsn(using Spartan 6), Novastar(using Spartan 6), popular asynchronous cards are control Dbstar(using Spartan-6 Altera) and HD. Synchronous card will synchronously display what is shown on your PC to the LED Display you set up. You need...