Texas Instruments OMAP5912 Reference Manual page 1596

Multimedia processor device overview and architecture

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USB OTG Controller

OMAP5912 USB Device Connection—With and Without the OMAP5912

Transceiverless Link Logic

transceiverless

Universal Serial Bus (USB)

Functionality that can be modeled by OMAP5912 transceiverless

The transceiverless link logic function in the OMAP5912 device interprets the

transmit control signals from the external USB integrated circuit and similar

signals from the OMAP5912 USB host controller or OMAP5912 USB device

controller and computes the equivalent USB differential pair state. The

computed differential pair state is interpreted and the appropriate transceiver

output signals are provided to the external USB integrated circuit and to the

OMAP5912 USB host controller or OMAP5912 USB device controller.

Two control bits help determine the proper differential pair state. TLL_ATTACH

and TLL_SPEED provide these inputs and are controlled by OMAP5912

differential pair models a pullup resistor as is implemented in a

transceiver-based USB device. TLL_SPEED is used solely to determine

whether the modeled pullup resistor is modeled on the internal version of D+

(for a full-speed transceiverless link) or D- (for a low-speed transceiverless

Transceiverless

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