关于PWM 的一般测试，应用蜂鸣器，调节蜂鸣器的频率与名声的时间-The general test of PWM, application buzzer, buzzer adjust the frequency and time reputation

网上声誉甚高的FPGA黑金开发板教程《verilog HDL那些事儿》。非常好的FPGA入门书籍。-Online high reputation of the FPGA development board tutorial black gold " verilog HDL that thing." FPGA very good introductory book.

do nhiet do lcd LEDs have a well-deserved reputation for high-efficiency operation, not to mention high reliability. Properly specified and implemented, LEDs should and do satisfy virtually every lighting application. Still, there are times when actu