TransDimension Inc.
Interfacing TD242LP to Intel StrongArm SA1110 Processor
1. Introduction
1.1 System Overview
TransDimension’s TD242LP is a low cost, high-performance, easily programmable chip
designed specifically for embedded USB host, USB function, and USB On-The-Go (OTG) dual
role device (DRD) applications. It can be configured to operate as:
A standard USB OTG DRD controller (Port 1) and a standard USB host controller (Port 2).
A standard USB function controller (Port 1) and a standard USB host controller (Port 2).
A standard USB 2-port host controller (Ports 1 and 2).
The chip is designed for the embedded USB applications, especially mobile and post-PC
products, including cell phones, palm platforms, personal digital assistants, set top boxes, home
gateway systems, and Internet appliances. Peer-to-Peer communication is made simple with the
TD242LP as USB connectivity can be achieved without the intervention of a personal computer.
The block diagram for the TD242LP is shown below.
OSC1
48 MHz
12 MHz
ENVREG
VREGOUT
VBUS
/EXVBO
VBP
OSC2
Voltage
Regulator
VBus Control
Circuit
PLL
CLKW/
CLKCFG
PSC
System
Configuration
&
/RESET
Control
Registers
/CS
/WR
/RD
HNP/ SRP
Logic
PSH
PSF
ID
USB Function
Controller
USB
Function
Control
Logic
A12:A1
D15:D0
Function
H/F
µP
Interface
Registers
SIE
OTG
Trans-
ceiver
DM1
DP1
INT
PSH
Memory
Blocks
Host
SIE
&
Root
Hub
USB
Trans-
ceiver
USB
Host
Control
Logic
DM2
DP2
USB Host
Controller
Registers
TEST
Test
Control
/PO
/OC
Figure 1: TD242LP block diagram
TransDimension, Inc.
1
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