Hi
我最近用TUSB8041做了个USB 3.0 hub扩展,上电后无法识别芯片,打印log如下,还请帮忙分析下原因,谢谢!
[ 3.463716] usb 1-1: new low-speed USB device number 3 using xhci-hcd
[ 3.576307] systemd[1]: System time before build time, advancing clock.
[ 3.595808] usb 1-1: device descriptor read/64, error -71
[ 3.604094] systemd[1]: systemd 237 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[ 3.625820] systemd[1]: Detected architecture arm64.
Welcome to Ubuntu 18.04.1 LTS!
[ 3.656411] systemd[1]: Set hostname to <localhost>.
[ 3.835923] usb 1-1: device descriptor read/64, error -71
[ 3.951777] usb usb1-port1: attempt power cycle
Kailyn Chen:
您好,下行端口接的是USB2.0的device是吗? 目前是TUSB8041 本身就不能被PC识别到是吗?
请附上您的电路图以便分析。
user4030839:
回复 Kailyn Chen:
你好,
1、下行端口接了一个USB2.0的U盘
2、CPU能识别TUSB8041,但是下行端口设备无法识别
3、上电时序:3.3V先上电,1.1V再上电,然后GRSTZ释放
黄色3.3V,蓝色1.1V
黄色GRSTZ,蓝色1.1V
4、电路图
6433.TUSB8041原理图.pdf