标题: 关于高速USB [打印本页] 作者: yuzengshu 时间: 2008-8-20 17:10 标题: 关于高速USB 请问告诉USB （isp1761），d0---d31，速率有快，需要做等长处理吗？我的误差最大2000mil，会出现问题吗？问有经验的朋友忙个忙啊，我知道高速USB d+ d-是480M。但不知道USB控制器数据的速率？？？谢谢作者: yuzengshu 时间: 2008-8-21 08:28
为什么没人回答呢作者: steven 时间: 2008-8-21 09:00
2000mil延时近0.5ns，有些大了，控制在几百比较好。作者: michaelw_wang 时间: 2008-8-22 08:51
D0~D31 is for host bus, its speed is set by host cpu or microcontroller. usually, this kind of asynchronous bus is not very fast (less than 100M). so 2000mil difference should be fine. Just make the length of RD_N and WR_N in the middle of D0_D31.6 Z3 m3 g( m" h2 C6 l
Good luck, and have fun!