4.2.2.1.1 Resetting the Device

A Reset and Discovery Response sequence is used by the host to reset the client device as well as to perform a general bus call to determine if a device is present on the bus.

To begin the Reset portion of the sequence, the host must drive SI/O low for the minimum t_RESET time. If the device is busy, driving the SI/O signal low will interrupt the current operation and reset the device.

Upon SI/O being released for a sufficient amount of time to allow the device time to power-up and initialize, the host must always request a Discovery Response Acknowledge from the SHA104-TFLXAUTH prior to any commands being sent to the device. The host can, then, determine if the SHA104-TFLXAUTH is present by sampling for the Discovery Response Acknowledge from the device.