SAM9G35_14 Datasheet, PDF (567/1293 Pages) ATMEL Corporation – ARM-based Embedded MPU

Upon command, a port’s transceiver must enter the High Speed receive mode and remain in that mode until the exit
action is taken. This enables the testing of output impedance, low level output voltage and loading characteristics. In
addition, while in this mode, upstream facing ports (and only upstream facing ports) must respond to any IN token
packet with a NAK handshake (only if the packet CRC is determined to be correct) within the normal allowed device
response time. This enables testing of the device squelch level circuitry and, additionally, provides a general purpose
stimulus/response test for basic functional testing.
SAM9G35 [DATASHEET]
11053E–ATARM–10-Mar-2014
567