Adaptation for ARC

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Debugger Adaptation for ARC

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Debugger Adaptation for ARC


ARM compatible 20-pin IDC connector with pins on 0.100" centers




VTREF12VSUPPLY (not used)
TRST- (optional)34GND
RTCK (optional)1112GND
SRST- (optional)1516GND
EVTI (optional)1718GND
EVTO (leave open)1920GND
Pin Direction Description
TCK|TCKC to CPU JTAG Clock. It is recommended to put a pull-down to GND on this signal.
TMS to CPU Standard JTAG TMS: It is recommended to put a pull-up to VTREF on this signal for standard 4-pin JTAG.
TMSC to/from CPU Compact JTAG TMSC: Your chip should have a bus-hold on this line for compact JTAG.
TDI to CPU JTAG TDI. It is recommended to put a pull-up to VTREF on this signal.
Only required for standard 4-pin JTAG / Optional signal for compact JTAG.
TDO from CPU JTAG TDO. (No pull-up or pull-down is required.)
Only required for standard 4-pin JTAG / Optional signal for compact JTAG.
TRST- to CPU JTAG Testport Reset. (Optional, No pull-up or pull-down is required.)
from CPU
JTAG Return Clock. (Optional, No pull-up or pull-down is required.)
VTREF from CPU Reference voltage. This voltage should indicate the nominal HIGH level for the JTAG and trace pins. So for example, if your signals have a voltage swing from 0 V ... 3.3 V, the VTREF pin should be connected to 3.3 V.
SRST- to/from CPU System Reset Signal. (Optional)
If your target board has a low active CPU reset signal, you can connect this low active reset signal to this pin. This enables the debugger to detect a CPU reset. Furthermore the debugger can drive this pin to GND to hold the CPU in the reset state. The debugger drives this pin as open-drain, so a pull-up is mandatory.
to CPU
Nexus Event In. (optional), only used with DesignWare ARC Trace to force a Nexus Synchronization Message.
from CPU
Nexus Event Out. (optional) This pin is not used by ARC processors. (Leave open (N/C) if not used)


Connector Type

  • This is a standard 20 pin double row (two rows of 10 pins) connector (pin to pin spacing: 2.54mm/0.100").
  • If terminal strip without shroud is used, the spacing marked with "A" must be a minimum of 30.6mm/1.2".


Order No.
Adapter Half-Size 20 pin
Converter IDC20A to MIPS-14
Converter IDC20A to MIPI-34 PowerTrace Serial
Converter IDC20A to Mictor-38
Converter IDC20A to MIPI-10/20/34
Converter IDC20A to XILINX-14
Converter IDC20A to Digilent PMOD™

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Last generated/modified: 07-Aug-2023