Universal Serial Bus Interface – On-The-Go Module
MCF52277 Reference Manual, Rev. 1
20-2
Freescale Semiconductor
For OTG operations, external circuitry is required to manage the host negotiation protocol (HNP) and
session request protocol (SRP). External ICs that are capable of providing the OTG VBUS with support
for HNP and SRP, as well as support for programmable pullup and pulldown resistors on the USB DP and
DM lines are available from various manufacturers.
The on-chip FS/LS transceiver also includes a programmable pullup resistor on USB DP. This pullup is
configurable via the CCM. Also, configurable 50 k
Ω
pulldown resistors are available on the USB_DP and
USB_DM signals of the on-chip transceiver. See
Section 9.3.4, “Miscellaneous Control Register
for more information. The primary function of the transceiver is the physical signal
conditioning of the external USB DP and DM cable signals for a USB 2.0 network. Several USB system
elements are not supported on the device as they are available via standard products from various
manufacturers.
20.1.2
Block Diagram
shows the USB On-The-Go interface using the on-chip full-speed/low-speed transceiver.
Figure 20-1. USB On-The-Go with on-chip FS/LS Transceiver Interface Block Diagram
20.1.3
Features
The USB On-The-Go module includes these features:
•
Complies with USB specification rev 2.0
•
USB host mode
Interr
upt Subsystem
DP
DM
VBUS
USB
Mini-AB
Connector
ID
I2C
Master
Optional
VBUS
Supply
OTG
Charge
Pump+
Res.
Required
Charge Pump
FS/LS
Transceiver
OTG
Control
Status
SCL/SDA
Interrupt
USBD_DP
USBD_DM
USB On-The-Go
US
B Host/De
v
/O
T
G
C
ontrolle
r
Board Interconnect
ColdFire Processor
Capacitor
Chip
Module
Configuration
In
te
rn
al Bus
Содержание MCF52277
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