hi,
A USB device is designed to connect with computer via ISOUSB211. its connection path is computer USB port ----usb device board( ISOUSB211-----USB communication IC).
#1,when USB device board is plug in a computer USB port, the computer's device manager can indicate that USB device board is connected successfully, but after for about 10S, the USB device board will be automatically removed from computer(the USB device board is not listed in computer device manager).
#2 if don't chose "allow the computer to turn off this device to save power" item in computer device manger, the USB device board can be kept connection with computer.it means the automatically un-connection issue is disappeared.let us describe this detailly
At first , USB device board is plug in computer USB port, the computer's device manager can indicate the USB device board is connected successfully. then immediately open computer device manager\universal serial Bus Controllers\EMCC marketing Card(customer USB device board name)\properties\Power management (shown as attached picture), then un-chose "allow the computer to turn off this device to save power" item , then the USB device board can be always listed in computer device manager.
Question:
1. Does ISOUSB211's "Supports L1 (sleep) and L2 (suspend) low-power states" feature cause this issue? if yes, can this feature be disable ?
2.As "allow the computer to turn off this device to save power" item in Windows system is chosen in default, any suggestion for customer board driver software to solve this issue?