usb-009
High-Speed
USB host
controller
USB
transceiver
USB
type A
connector
USB
type B
connector
USB
transceiver
USB
peripheral
controller
USB
peripheral
controller
Transceiverless
link logic
VBUS
control
Device
Device
Functionality that can be modeled by transceiverless link logic
Transceiverless
link logic
enabled
Without
transceiverless
link logic
High-Speed
USB host
controller
Public Version
High-Speed USB Host Subsystem
www.ti.com
When using the TLL, signals of the external USB IC pins, which typically connect to a USB transceiver,
instead directly connect to the device pins. Signaling on these pins use CMOS levels. TLL logic can be
used with external devices that support ULPI TLL interface and serial 6-pin TLL interface connectivity.
The TLL function in the device interprets the transmit control signals from the external USB IC and similar
signals from the device USB host 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 IC and to the device USB host controller.
shows the device and how TLL can be compared to a typical USB implementation. The top
portion of
shows the a transceiver-based solution, and the bottom portion shows a
transceiverless solution using TLL.
Figure 22-10. High-Speed USB Host Controller Connection-With and Without TLL
NOTE:
The USB bus lines (D+/D–) no longer appear in subsequent figures: They are emulated by
the TLL.
22.2.2.3 ULPI Interfaces
The high-speed USB host subsystem supports the following configurations with the ULPI interfaces:
•
External USB transceiver
–
ULPI interfaces: 12-pin/8-bit data SDR version
•
TLL
–
ULPI TLL interfaces: 12-pin/8-bit data SDR and 8-pin/4-bit data DDR versions
The high-speed USB host subsystem supports USB ports, which use the ULPI interface mode to connect
to an off-chip high-speed ULPI transceiver (12-pin/8-bit data SDR mode) for high- and full-speed data
transactions (up to 480M bit/s). Using the ULPI interfaces in 12-pin/8-bit data version, the device and the
transceiver achieve the USB function. A mini A-B external receptacle allows the connection of an external
device.
The device supports TLL logic interfaces on its ports in the ULPI TLL interface mode. TLL modes enable
glueless interconnect to another USB device port without a costly transceiver.
3238
High-Speed USB Host Subsystem and High-Speed USB OTG Controller
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated