双端口SDRAM控制器，将SDRAM虚拟成两个端口，已经在ALTER DE2开发板的硬件上验证通过，采用Verilog HDL语言编写。-Dual-port SDRAM controller, SDRAM virtual into two ports, have ALTER DE2 development board hardware verification by using the Verilog HDL language.

通过PS2口连接键盘与FPGA，按动1-7数字键达到虚拟电子琴的效果-PS2 keyboard port connect to the FPGA ，press the number keys 1-7 to reach the effect of the virtual keyboard