Data Sheet
TransDimension
TD1120
Host Negotiation Protocol (HNP): Hardware HNP is a built-in state machine, which reduces microprocessor
interrupts. HNP, when enabled, will support negotiation with an attached OTG device, in order to determine which
role, (A-device or B-device) the TD1120 will operate within a session. The TD1120 contains the required analog
components (comparators, etc.) and digital logic to support the operation. The microprocessor interfaced to the
TD1120 can also disable this HNP and configure the dual-role device port of the TD1120 to operate as a Host or
Peripheral. HNP may only be implemented in conjunction with a Mini-AB receptacle.
Session Request Protocol (SRP): The USB OTG specification is positioned to service mobile products that are
battery powered. The SRP protocol allows the A-device to conserve power by turning the USB VBus signal off
depending on whether there is USB traffic, whereas, in non-OTG operation mode, VBus can not be turned off to
take advantage of the power saving capability. The B-device will have the capability to initiate bus activity via SRP
and hence the A-device will be capable of responding to this via SRP. The TD1120 On-The-Go port fully complies
with the SRP protocol as described and defined in the USB On-The-Go specification.
Operational Modes: The TD1120 can be operated in different modes via software configuration:
Peripheral
Port 1
Port 2
port
Application
(DP1, DM1) (DP2, DM2)
(P_DP, P_DM)
OTG application and one Host port (Concurrent
OTG/Host operation supported. The OTG port
may behave in either Host or Peripheral modes
and dynamically switch between roles through the
HNP, or when directed by a user by changing the
USB cable connection)
OTG
Host
On-The-Go
and Host
Peripheral
Host
Host
One high-speed Peripheral and two full-speed
Hosts supporting simultaneous operation
Peripheral
and Host
Note: If using OTG application, then the TD1120 can be configured to support two ports, one Host and one OTG.
When OTG is not utilized, then the TD1120 can be configured to support 3 ports, two Hosts and one Peripheral.
Microprocessor interface: The TD1120 is a memory mapped device that can gluelessly interface to the system
bus of most popular microprocessors, CISC, RISC and DSPs including but not limited to x86, Intel XScale &
StrongARM, Hitachi SH3, Fujitsu SPARCLite, NEC and Toshiba MIPS, ARM7, ARM9, Motorola PowerPC, ColdFire
and Dragonball, among others. Reference designs and evaluation boards are available with new designs added
and tailored to fit particular customer needs.
Software support: TransDimension is a leader in the USB embedded market, bringing both software and silicon
to its customers. TransDimension provides development and support packages and a wide spectrum of USB host
and On-The-Go software support in C source code to reduce development cost and time to market for its
customers. Software for a variety of operating systems is fully tested and supported to easily interoperate with the
above listed Microprocessors. TransDimension is a Microsoft Windows embedded partner.
TransDimension is a Microsoft Windows Embedded Partner (WEP) and supplies Host Controller Driver (HCD)
Interface code to the TD1120 for Linux and WinCE operating systems, as well as applicable USB class and device
drivers for use in a wide variety of mobile and post-PC products.
For many other Real Time Operating Systems (RTOS) as listed previously, TransDimension and SoftConnex
supply the USBLink On-The-Go software solution, which utilizes proven software technologies from SoftConnex’s
USBLink Host and USBLink Device software products, thereby providing a complete, integrated solution for USB
On-The-Go applications.
TransDimension Inc. — Proprietary
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