adsp-21992 Analog Devices, Inc., adsp-21992 Datasheet - Page 15

• Manufacturer Part Number: adsp-21992
• Description: Mixed Signal Dsp Controller With Can
• Manufacturer: Analog Devices, Inc.

INSTRUCTION SET DESCRIPTION
The ADSP-21992 assembly language instruction set has an alge-
braic syntax that was designed for ease of coding and
readability. The assembly language, which takes full advantage
of the unique architecture of the processor, offers the following
benefits:
DEVELOPMENT TOOLS
The ADSP-21992 is supported with a complete set of
CROSSCORE™ software and hardware development tools,
including Analog Devices emulators and VisualDSP++™ devel-
opment environment. The emulator hardware that supports
other SHARC DSPs also fully emulates the ADSP-21992.
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++ runtime library that includes DSP and
mathematical functions. A key point for these tools is C/C++
code efficiency. The compiler has been developed for efficient
translation of C/C++ code to DSP assembly. The DSP has archi-
tectural features that improve the efficiency of compiled C/C++
code.
The VisualDSP++ debugger has a number of important fea-
tures. Data visualization is enhanced by a plotting package that
offers a significant level of flexibility. This graphical representa-
tion of user data enables the programmer to quickly determine
the performance of an algorithm. As algorithms grow in com-
• SHARC assembly language syntax is a superset of and
• The algebraic syntax eliminates the need to remember
• Every instruction, but two, assembles into a single, 24-bit
• Multifunction instructions allow parallel execution of an
• Program flow instructions support a wider variety of con-
source code compatible (except for two data registers and
DAG base address registers) with ADSP-21xx family syn-
tax. It may be necessary to restructure ADSP-21xx
programs to accommodate the unified memory space of
the ADSP-21992 and to conform to its interrupt
vector map.
cryptic assembler mnemonics. For example, a typical arith-
metic add instruction, such as AR = AX0 + AY0, resembles
a simple equation.
word that can execute in a single instruction cycle. The
exceptions are two dual word instructions. One writes
16- or 24-bit immediate data to memory, and the other is
an absolute jump/call with the 24-bit address specified in
the instruction.
arithmetic, MAC, or shift instruction with up to two
fetches or one write to processor memory space during a
single instruction cycle.
ditional and unconditional jumps/calls and a larger set of
conditions on which to base execution of conditional
instructions.
Rev. A | Page 15 of 60 | August 2007
plexity, this capability can have a significant influence on the
design development schedule by increasing productivity. Statis-
tical 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 effi-
ciently. By using the profiler, the programmer 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:
The VisualDSP++ IDDE lets programmers define and manage
DSP software development. Its dialog boxes and property pages
let programmers configure and manage all of the SHARC devel-
opment tools, including the color syntax highlighting in the
VisualDSP++ editor. This capability permits programmers to:
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.
• View mixed C/C++ and assembly code (interleaved source
• Insert breakpoints
• Set conditional breakpoints on registers, memory,
• 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
• Control how the development tools process inputs and
• Maintain a one-to-one correspondence with the command
and object information)
and stacks
generate outputs
line switches of the tool
ADSP-21992