LM3S317 Luminary Micro, Inc, LM3S317 Datasheet - Page 40
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LM3S317
Manufacturer Part Number
LM3S317
Description
Lm3s317 Arm Microcontroller
Manufacturer
Luminary Micro, Inc
Datasheet
1.LM3S317.pdf
(376 pages)
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JTAG Interface
5
40
JTAG Interface
The Joint Test Action Group (JTAG) port is an IEEE standard that defines a Test Access Port and
Boundary Scan Architecture for digital integrated circuits and provides a standardized serial
interface for controlling the associated test logic. The TAP, Instruction Register (IR), and Data
Registers (DR) can be used to test the interconnections of assembled printed circuit boards and
obtain manufacturing information on the components. The JTAG Port also provides a means of
accessing and controlling design-for-test features such as I/O pin observation and control, scan
testing, and debugging.
The JTAG port is comprised of the standard five pins: TRST, TCK, TMS, TDI, and TDO. Data is
transmitted serially into the controller on TDI and out of the controller on TDO. The interpretation of
this data is dependent on the current state of the TAP controller. For detailed information on the
operation of the JTAG port and TAP controller, please refer to the IEEE Standard 1149.1-Test
Access Port and Boundary-Scan Architecture.
The LMI JTAG controller works with the ARM JTAG controller built into the Cortex-M3 core. This is
implemented by multiplexing the TDO outputs from both JTAG controllers. ARM JTAG instructions
select the ARM TDO output while LMI JTAG instructions select the LMI TDO outputs. The
multiplexer is controlled by the LMI JTAG controller, which has comprehensive programming for
the ARM, LMI, and unimplemented JTAG instructions.
The JTAG module has the following features:
See the ARM® Cortex™-M3 Technical Reference Manual for more information on the ARM JTAG
controller.
IEEE 1149.1-1990 compatible Test Access Port (TAP) controller
Four-bit Instruction Register (IR) chain for storing JTAG instructions
IEEE standard instructions:
–
–
–
–
–
ARM additional instructions:
–
–
–
Integrated ARM Serial Wire Debug (SWD)
BYPASS instruction
IDCODE instruction
SAMPLE/PRELOAD instruction
EXTEST instruction
INTEST instruction
APACC instruction
DPACC instruction
ABORT instruction
Preliminary
February 6, 2007
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