TMP92CZ26A

92CZ26A-476

3. When generating toggle error of device controller
a. UDC operation
If USB host fail to receive ACK transmitted from UDC in OUT transfer, USB
host transmits the same data to UDC again. When the FIFO is availa ble to receive,
UDC detects toggle error because of detecting the same data(having the same
toggle as the data which is received just before) and returns ACK. UDC rejects it
because the data have already received normally. While, if FIFO is not available,
UDC returns NAK and inform s USB host that is unable to receive.
4. If using USB device controller in TMP92CZ26A, the crystal oscillator (USB standard
10 MHz±2500ppm) is recommended. And in this case, the stage of external hub can be
used until max 3 stages b y the precis ion of this US B device cont roller an d the int ernal
clock. If USB compliance (USB logo) is needed, the 5 stages connection is needed for
external hub . And it is needed th at input 48MHz clock from X1 USB pin (USB standard
±2500ppm.)