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TWR-K70F120M Tower Module User's Manual
Page 15 of 25
TWR-SER
J2
3-4
TWR-SER
J3
2-3
TWR-SER
J12
9-10
2.14
USB
The K70FN1M0 features two different USB modules--a USB full-speed/low-speed OTG/Host/Device
controller with built-in transceiver and a high-speed OTG/Host/Device controller that requires a
external ULPI PHY.
2.14.1
FS/LS USB
The TWR-K70F120M routes the USB D+ and D- signals from the K70 MCU to the Primary Connector,
allowing the connection to external USB connectors or additional circuitry on a Tower peripheral
module.
The TWR-SER module included as part of the TWR-K70F120M-KIT provides a USB OTG/Host/Device
interface with a mini-AB USB connector. There are many configuration options that can be selected to
evaluate different USB modes of operation. By default, the TWR-SER is configured for USB Device
operation. Please refer to the documentation included with the TWR-SER for more information on the
configuration options.
Note:
In order to use the USB module in true OTG mode, VREGIN must be powered before the USB
cable is plugged in. By default the board does not support this. The board can be modified by removing
the jumper on J1, then directly connecting P5V_ELEV (or another 5V net that will be active during
testing) to pin1 of J1 so that VREGIN has a 5V supply independent of the USB port on the TWR-SER
board.
2.14.2
HS USB
The TWR-K70F120M routes the ULPI interface signals for the high-speed USB module to the Secondary
Connector allowing the connection to an external ULPI PHY or additional circuitry on a Tower
peripheral module.
The TWR-SER2 module includes a ULPI PHY that can be used with the TWR-K70F120M in order to
evaluate the high-speed USB functionality. The TWR-SER2 is not included as part of the TWR-
K70F120M-KIT, but the boards can be ordered individually from Freescale.
2.15
Secure Digital Card Slot
A Micro-Secure Digital (SD) card slot is available on the TWR-K70F120M connected to the SD Host
Controller (SDHC) signals of the K70 MCU. This slot will accept micro-SD memory cards. Refer to Table
6 “I/O Connectors and Pin Usage Table” for the SDHC signal connection details.
2.16
External Bus Interface – FlexBus
The K70 device features a multi-function external bus interface called the FlexBus interface controller
capable of interfacing to slave-only devices. The FlexBus interface is not used directly on the TWR-
K70F120M. Instead, a subset of the FlexBus is connected to the Primary Connector so that the external