Lantronix DSTni-EX manual USB Interface Signals, Clock CLK, USP Speed, USB Suspend, Suspnd, Usboe

USB Interface Signals

Clock (CLK)	The clock input is required to be connected to a 12 MHz signal that is derived
	from the USB signals.
USP Speed	The USB speed indicator is used by external USB transceiver logic to
(SPEED)	determine which speed interface the USB is implementing.
	1 = USB is operating at full speed.
	0 = USB is a low-speed device.
USB Suspend	The USB suspend signal is used by external logic to determine when the USB
(SUSPND)	is in suspend mode. This is useful when external logic must enter a low-power
	mode during suspend.
	1 = USB is suspended.
	0 = USB is operational.
USB Output Enable	The USB output enable signal is designed to be connected to the tri-state
(USBOE)	control of USB transceivers.
	1 = USB core drives serial data on to the USB.
USB Data Plus	The USB data plus output signal transmits the NRZI-encoded serial data to
Output (DPO)	the D+ side of the USB.
USB Data Minus	The USB data minus output signal transmits the NRZI-encoded serial data to
Output (DMO)	the D- side of the USB.
USB Receive Data	Connects the USB receive data input to a NRZ serial data stream decoded
(RCV)	from the USB D+ and D- signals. Typically, this signal connects to DATAOUT
	output from the digital phase lock loop. The USB core assumes that this input
	signal is synchronous to the CLK signal.
USB End Of Packet	The USB end-of-packet input should be active when a end of packet condition
(EOP)	is decoded on the USB D+ and D- signals. Typically, this signal connects to
	EOP output from the digital phase lock loop. The USB core assumes that this
	input signal is synchronous to the CLK signal.
USB Single Ended	The USB single-ended zero input should be active when a single-ended zero
Zero (SE0)	condition decodes on the USB D+ and D- signals. Typically this signal
	connects to SE0 output from the digital phase lock loop. The USB core
	assumes that this input signal is synchronous to the CLK signal.
HOST Mode Enable	The HOST Mode Enable signal provides external programmable control of
(HOST_MODE)	Host Mode functions. This typically includes the pull-up/pull-down resisters
	necessary to implement a USB target peripheral or a USB Host controller. For
	more information on the requisite pull-up/pull-down control see USB Pull-
	up/Pull-down Resistors on page 53.

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