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C6000 Debugger | 65
©
1989-2022
Lauterbach
Mechanical Description of the TI Connector
This connector is defined by Texas Instruments. It is typically used on TMS320 designs. LAUTERBACH’s
debuggers are not supplied with this connector, but an adapter is available (LA-7748: JTAG ARM Converter
ARM-TI).
This is a standard 14 pin double row (two rows of seven pins) connector (pin-to-pin spacing: 0.100 in.).
Electrical Description of the TI Connector
•
TCK, TMS, TDI and nTRST are driven by a VHC125 driver which is supplied with VCCS.
Therefore the ICD/AICD can work in an voltage range of (2.25 V) 2.5 … 5.0 V (5.5 V). In normal
operation mode this driver is enabled, but it can be disabled to give another tool access to the
JTAG port. The TMS, TDI and nTRST lines have a 47k pull-up resistor in the ICD connector.
In environments where multiple tools can access the JTAG port, it is absolutely required that
there is a pull down resistor at TCK. This is to ensure that TCK is low during a handover between
different tools.
•
TDO is ICD input only and needs standard TTL level.
•
VTREF is used as a sense line for the target voltage. It is also used as supply voltage for the
output driver of the ICD interface to make an adaptation to the target voltage (I
VCCS
app. 3 mA).
•
nRESET (= nSRST) is used by the debugger to reset the target CPU or to detect a reset on the
target. It is driven by an open collector buffer. A 22k pull-up resistor is included in the ICD
connector. The debugger will only assert a pulse on nRESET when the SYStem.Up command is
executed. If it is ensured that the DSP is able to enter debug mode every time (no hang-up
condition), the nRESET line is optional.
•
EMUx are signals of processors from Texas Instruments for additional, programmable debug
features.
Signal
Pin
Pin
Signal
TMS|TMSC|SWDIO
1
2
TRST-
TDI
3
4
GND
VTREF
5
6
GND (KEY)
TDO
7
8
GND
RTCK
9
10
GND
TCK|TCKC|SWCLK
11
12
GND
EMU0
13
14
EMU1