to nmtr:thanks for your reply,currently i'm coding an IP core for my master thesis,my goal is make the IP core compatible with AMBA bus,so i exactly need write a wrapper for the IP,the wrapper connect IP's data and addr buses and also provide AMBA bus with the data and addr buses,as well as some control signal which is required by AMBA spec,but i think there is no need to connect all IP's signal IOs to AMBA bus,is that right?for example,the IP has an video synchronized input,one bit width,i connect it from outer source.for AHB,could you tell me the typical bus clock frequency?thanks a lot!