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and the OTG VBUS charge pump. For OTG applications requiring full host power (100 – 500 mA
downstream current), an additional USB power-switch chip may be used. This OTG configuration may be
used as a USB device, host, or dual-role device under firmware control.
USB On-The-Go
Configuration
Module
Figure 21-2. USB On-The-Go module and ULPI transceiver/PHY
21.1.3
Features
The USB On-The-Go module includes these features:
•
Complies with USB specification rev 2.0
•
USB host mode
— Supports enhanced-host-controller interface (EHCI).
— Allows direct connection of FS/LS devices without an OHCI/UHCI companion controller.
— Supported by Linux and other commercially available operating systems.
•
USB device mode
— Supports full-speed operation via the on-chip transceiver.
— Supports full-speed/high-speed operation via an external ULPI transceiver.
— Supports one upstream facing port.
— Supports four programmable, bidirectional USB endpoints, including endpoint 0. See endpoint
configurations:
Freescale Semiconductor
ColdFire Processor
FS/LS
Transceiver
ULPI
Interface
OTG
Control
Status
Chip
I2C
Master
MCF5329 Reference Manual, Rev 3
Universal Serial Bus Interface – On-The-Go Module
Board Interconnect
DP
ULPI
NC
DM
PHY
Optional
VBUS
Supply
SCL/SDA
USB
Mini-AB
Connector
DP
DM
VBUS
ID
21-3
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