Rev. D
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Page 9 of 48
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May 2012
POWER DOMAINS
The ADSP-TS203S processor has separate power supply con-
nections for internal logic (VDD), analog circuits (VDD_A), I/O
buffer (VDD_IO), and internal DRAM (VDD_DRAM) power
supply.
Note that the analog (VDD_A) supply powers the clock generator
PLLs. To produce a stable clock, systems must provide a clean
power supply to power input VDD_A. Designs must pay critical
attention to bypassing the VDD_A supply.
DEVELOPMENT TOOLS
The ADSP-TS203S processor is supported with a complete set
of CROSSCORE
software and hardware development tools,
including Analog Devices emulators and VisualDSP++
devel-
opment environment. The same emulator hardware that
supports other TigerSHARC processors also fully emulates the
ADSP-TS203S processor.
The VisualDSP++ project management environment lets pro-
grammers develop and debug an application. This environment
includes an easy to use assembler (which is based on an alge-
braic syntax), an archiver (librarian/library builder), a linker, a
loader, a cycle-accurate instruction-level simulator, a C/C++
compiler, and a C/C++ run-time library that includes DSP and
mathematical functions. A key point for theses tools is C/C++
code efficiency. The compiler has been developed for efficient
translation of C/C++ code to DSP assembly. The processor has
architectural features that improve the efficiency of compiled
C/C++ code.
The VisualDSP++ debugger has a number of important
features. Data visualization is enhanced by a plotting package
that offers a significant level of flexibility. This graphical
representation of user data enables the programmer to quickly
determine the performance of an algorithm. As algorithms grow
in complexity, this capability can have increasing significance
on the designer’s development schedule, increasing productiv-
ity. Statistical profiling enables the programmer to
nonintrusively poll the processor as it is running the program.
This feature, unique to VisualDSP++, enables the software
developer to passively gather important code execution metrics
without interrupting the real-time characteristics of the
program. Essentially, the developer can identify bottlenecks in
software quickly and efficiently. By using the profiler, the pro-
grammer can focus on those areas in the program that impact
performance and take corrective action.
Debugging both C/C++ and assembly programs with the
VisualDSP++ debugger, programmers can:
View mixed C/C++ and assembly code (interleaved source
and object information)
Insert breakpoints
Set conditional breakpoints on registers, memory,
and stacks
Trace instruction execution
Perform linear or statistical profiling of program execution
Fill, dump, and graphically plot the contents of memory
Perform source level debugging
Create custom debugger windows
The VisualDSP++ IDE lets programmers define and manage
DSP software development. Its dialog boxes and property pages
let programmers configure and manage all of the TigerSHARC
processor development tools, including the color syntax high-
lighting in the VisualDSP++ editor. This capability permits
programmers to:
Control how the development tools process inputs and
generate outputs
Maintain a one-to-one correspondence with the tool’s
command line switches
The VisualDSP++ Kernel (VDK) incorporates scheduling and
resource management tailored specifically to address the mem-
ory and timing constraints of DSP programming. These
capabilities enable engineers to develop code more effectively,
eliminating the need to start from the very beginning when
developing new application code. The VDK features include
threads, critical and unscheduled regions, semaphores, events,
and device flags. The VDK also supports priority-based, pre-
emptive, cooperative, and time-sliced scheduling approaches. In
addition, the VDK was designed to be scalable. If the application
does not use a specific feature, the support code for that feature
is excluded from the target system.
Because the VDK is a library, a developer can decide whether to
use it or not. The VDK is integrated into the VisualDSP++
development environment, but can also be used via standard
command line tools. When the VDK is used, the development
environment assists the developer with many error-prone tasks
and assists in managing system resources, automating the gen-
eration of various VDK-based objects, and visualizing the
system state, when debugging an application that uses the VDK.
VCSE is Analog Devices’ technology for creating, using, and
reusing software components (independent modules of sub-
stantial functionality) to quickly and reliably assemble software
applications. It is also used for downloading components from
the Web, dropping them into the application, and publish com-
ponent archives from within VisualDSP++. VCSE supports
component implementation in C/C++ or assembly language.
Figure 5. SCLK_VREF Filtering Scheme
CLOCK DRIVER
VOLTAGE OR
VDD_IO
VSS
SCLK_VREF
R1
R2
C1
C2
*
*IF CLOCK DRIVER VOLTAGE > VDD_IO