Product Brief
March 19, 2004
Rev 1.8
TD243
Three Port, Single Chip USB On-The-Go Host/Peripheral Controller
Description
TransDimension’s TD243 is a single chip USB Host
and Peripheral controller that is the first of a family of
integrated low-cost, high-performance, On-the-Go
(OTG) controllers optimized and specifically designed
for embedded systems, peripherals, mobile
communication, and consumer products. It is a
combination of a standard USB host controller and an
OTG Dual-Role Device controller. The TD243 enables
any embedded system to operate as a USB Host and
Peripheral, thereby dramatically expanding the degree
of interconnectivity and extending the applicability of
the USB into many new areas. Software support for
the TD243 is available from SoftConnex Technologies,
Inc., a wholly owned subsidiary of TransDimension
Inc., and includes USBLink OTG Stack, ported to a
wide variety of RTOSs, interface code to the TD243
and USB device drivers. Peer-to-Peer connectivity is
made simple with the TD243 since USB connectivity is
achieved without PC intervention. Applications include
mobile and post-PC products such as cellular phone,
palmtop PC, PDA, set top box, home gateway, and
Internet appliances, to name a few. The TD243 can
operate in the following modes:
USB On-the-Go Dual-Role Device: One OTG port
plus a standard USB host with two downstream
ports
Simultaneous standard USB host with two
downstream ports and one USB peripheral
upstream port
Standard USB host with three downstream ports
The host controller in the TD243 is the only true
transfer level embedded USB host and On-the-Go
controller that can be interfaced directly to most
popular microprocessors and easily programmable.
The active endpoint and transfer descriptors are
located in the on-chip memory, thus significantly
reducing processor overhead relative to any
comparable product on the market.
The full speed peripheral controller is very flexible and
software configurable, in terms of the active endpoint
number (8), type, size, and buffering mechanism of
each endpoint.
Fully compliant with USB On-the-Go specification
and USB Specification Rev. 2.0 for full-speed
(12Mb/s) and low-speed (1.5Mb/s) USB devices
High-performance USB host: Full USB bandwidth
utilization with low load on system microprocessor
without bus mastering
Transaction scheduling and transfer level protocol
implemented in hardware including bandwidth
management, data toggle and retry
Guaranteed isochronous transfer with loose timing
requirements on the microprocessor
Fast microprocessor and dual-DMA interface
access cycle (~25MB/s for 16-bit data bus, and
~50MB/s for 32-bit data bus)
Double/multi buffering support for all four types of
USB transfers
Separate transfer descriptor and data memory
space
On-chip charge pump generates 5V power up to
12mA, capable of supporting more bus-powered
devices than specified in the USB On-the-Go
specification
Capable of supporting up to 500mA to peripherals
when using external 5V power supply while
controlling an external charge pump
Integrated on-chip pull-up and pull-down resistors
Power saving mode for whole chip and host
controller, and suspend mode for peripheral
controller
Integrated PLL supports external crystal or crystal
oscillators of 6MHz, 12MHz, 24MHz, and 48MHz
Single 3.3V power supply, 3.3 V I/O
(LVCMOS/TTL), 5 V tolerant
Software and hardware Host Negotiation Protocol
Session Request Protocol
Direct interface to microprocessors, RISC, CISC,
and DSP’s 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
Features
Concurrent operation of On-The-Go, Host and
Peripheral ports
TransDimension Inc. — Proprietary
OXFORD [ OXFORD SEMICONDUCTOR ]
