ADSP-21161N Datasheet, PDF (10/60 Pages) Analog Devices – DSP Microcomputer

ADSP-21161N
a cycle-accurate instruction-level simulator, a C/C++ compiler,
and a C/C++ run-time library that includes DSP and mathemat-
ical functions. Two key points for these tools are:
• Compiled ADSP-21161N C/C++ code efficiency—The
compiler has been developed for efficient translation of
C/C++ code to ADSP-21161N assembly. The DSP has
architectural features that improve the efficiency of
compiled C/C++ code.
• ADSP-2106x family code compatibility—The assembler
has legacy features to ease the conversion of existing
ADSP-2106x applications to the ADSP-21161N.
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 break points
• 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
• 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 ADSP-21xxx
development tools, including the syntax highlighting in the
VisualDSP++ editor. This capability permits:
• Controlling how the development tools process inputs
and generate outputs.
• Maintaining a one-to-one correspondence with the tool’s
command line switches.
Analog Devices DSP emulators use the IEEE 1149.1 JTAG test
access port of the ADSP-21161N processor to monitor and
control the target board processor during emulation. The
emulator provides full-speed emulation, allowing inspection and
modification of memory, registers, and processor stacks. Nonin-
trusive in-circuit emulation is assured by the use of the processor’s
JTAG interface—the emulator does not affect target system
loading or timing.
In addition to the software and hardware development tools
available from Analog Devices, third parties provide a wide range
of tools supporting the ADSP-21xxx processor family. Hardware
tools include ADSP-21xxx PC plug-in cards. Third Party
software tools include DSP libraries, real-time operating systems,
and block diagram design tools.
Designing an Emulator-Compatible DSP Board
(Target)
The Analog Devices DSP Tools family of emulators are tools that
every DSP developer needs to test and debug hardware and
software systems. Analog Devices has supplied an IEEE 1149.1
JTAG Test Access Port (TAP) on each JTAG DSP. The emulator
uses the TAP to access the internal features of the DSP, allowing
the developer to load code, set breakpoints, observe variables,
observe memory, and examine registers. The DSP must be halted
to send data and commands, but once an operation has been
completed by the emulator, the DSP system is set running at full
speed with no impact on system timing.
To use these emulators, the target’s design must include the
interface between an Analog Devices JTAG DSP and the
emulation header on a custom DSP target board.
Target Board Header
The emulator interface to an Analog Devices JTAG DSP is a
14-pin header, as shown in Figure 6. The customer must supply
this header on the target board in order to communicate with the
emulator. The interface consists of a standard dual row 0.025"
square post header, set on 0.1" × 0.1" spacing, with a minimum
post length of 0.235". Pin 3 is the key position used to prevent
the pod from being inserted backwards. This pin must be clipped
on the target board.
Also, the clearance (length, width, and height) around the header
must be considered. Leave a clearance of at least 0.15" and 0.10"
around the length and width of the header, and reserve a height
clearance to attach and detach the pod connector.
As can be seen in Figure 6, there are two sets of signals on the
header. There are the standard JTAG signals TMS, TCK, TDI,
TDO, TRST, and EMU used for emulation purposes (via an
emulator). There are also secondary JTAG signals BTMS,
BTCK, BTDI, and BTRST that are optionally used for board-
level (boundary scan) testing.
1
GND
3
KEY (NO PIN)
5
BTMS
7
BTCK
9
BTRST
11
BTDI
13
GND
2
EMU
4
GND
6
TMS
8
TCK
10
TRST
12
TDI
14
TDO
TOP VIEW
Figure 6. JTAG Target Board Connector for JTAG
Equipped Analog Devices DSP (Jumpers in Place)
When the emulator is not connected to this header, place jumpers
across BTMS, BTCK, BTRST, and BTDI as shown in Figure 7.
This holds the JTAG signals in the correct state to allow the DSP
to run free. Remove all the jumpers when connecting the
emulator to the JTAG header.
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REV. A