20-pin 1.27 x 2.54mm Compact TI-20 Debug Adapter
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This debug adapter is used to connect the BlueBox to the Cortex-M based target. It’s used to connect to the embedded target featuring a 20-pin 1.27 x 2.54 mm target debug connector with the Compact TI-20 pinout.
The debug adapter connects to the 25 cm 40-pin ribbon cable coming from the BlueBox and to the target debug connector on the other side.
The following pinout is valid on the target side:
Signal Direction |
Signal Description |
Signal |
Pin |
Pin |
Signal |
Signal Description |
Signal Direction |
|---|---|---|---|---|---|---|---|
O |
JTAG |
TMS |
1 |
2 |
nTRST |
JTAG |
O |
O |
JTAG |
TDI |
3 |
4 |
GND |
Ground |
|
I |
Reference Voltage |
Vref |
5 |
6 |
KEY |
Not connected |
|
I |
JTAG |
TDO |
7 |
8 |
GND |
Ground |
|
I |
Return TCK |
RTCK |
9 |
10 |
GND |
Ground |
|
O |
JTAG |
TCK |
11 |
12 |
GND |
Ground |
|
I |
Emulation pins |
EMU0 |
13 |
14 |
EMU1 |
Emulation pins |
I |
I/O |
Reset |
nRESET |
15 |
16 |
GND |
Ground |
|
I |
Emulation pins |
EMU2 |
17 |
18 |
EMU3 |
Emulation pins |
I |
I |
Emulation pins |
EMU4 |
19 |
20 |
GND |
Ground |
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20-pin Compact TI-20 pinout
Signal Direction is described from the BlueBox perspective.
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When initially connecting the BlueBox to a target, ensure the debug adapter pinout matches the Target connector to avoid potential hardware failure. |
20-pin 1.27 x 2.54 mm Compact TI-20 Debug Adapter features resettable fuses on all pins except for pin 9, 13, 14, 17-19. These fuses protect debug signals against overcurrent and cycle back to a conductive state after the excessive current fades away. Signals on pins 13, 14, 17-19 are protected via 100 ohm serial resistors.
Jumpers J1 and J2
Jumpers J1 and J2 selects whether the EMU0 (J1) or the EMU1 (J2) is tied to pull-up (position 1-2) or directly to the GND (position 2-3).
The EMU signals’ functions may vary from board to board. See target board manual and schematics for more information on how to set the jumpers.
The debug adapter connects to the target via a 20-pin 1.27 x 2.54 mm connector, for example Sullins Connector Solutions: SFH41-PPPB-D10-ID-BK. A target should feature a matching part, for example Samtec FTR-110-51-G-D-P.
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Make sure this adapter fits on your target connector - check Cross Table. |
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Refer to Hardware Setup and Configuration Tutorial to get more information on how to connect the hardware. |
