JTAG connector

On this page you can find information about JTAG connector. There are many commonly used connectors and pin outs, for the JTAG Boundary Scan connector no general standard is defined, below you can find commonly used JTAG connector type:


  • Altera Byteblaster JTAG Pinout
  • Xilinx Parallel Cable IV JTAG Pinout
  • PowerPC JTAG Pinout
  • ARM JTAG Pinout
  • Mips EJTAG Pinout
  • FPGA JTAG Pinouts
  • CPLD JTAG Pinouts
  • 10-Pin JTAG Connector Pinout

10 PIN IDC MALE at the CPU.

10 PIN IDC FEMALE at the cable/programmer.

Pin Name Dir Description
1 TCK --- Test Clock
2 GND --- Ground
3 TDO --- Test Data Output
4 VTref ---
5 TMS --- Test Mode Select
6 nSRST --- System Reset
7 Vsupply ---
8 NC --- Not connected
9 TDI --- Test Data Input
10 GND --- Ground

Note: Direction is target (CPU) relative JTAG-bus (PC)

  • 20-Pin JTAG Connector Pinout

Used for ARM processors.

Idc20m.png

20 PIN IDC MALE at the CPU.

Idc20f.png

20 PIN IDC FEMALE at the cable/programmer.

Pin Name Dir Description
1 VTref ---
2 GND or VSupply --- Ground or VSupply
3 nTRST ---
4 GND --- Ground
5 TDI --- Test Data Input
6 GND --- Ground
7 TMS --- Test Mode Select
8 GND --- Ground
9 TCK --- Test Clock
10 GND --- Ground
11 RTCK ---
12 GND --- Ground
13 TDO --- Test Data Output
14 GND --- Ground
15 nSRST ---
16 GND --- Ground
17 DBGRQ ---
18 GND --- Ground
19 DBGACK ---
20 GND --- Ground
  • 14-Pin JTAG Connector Pinout

14 PIN IDC MALE at the CPU.

14 PIN IDC FEMALE at the cable/programmer.

Pin Name Dir Description
1 VCC ---
2 GND --- Ground
3 nTRST ---
4 GND --- Ground
5 TDI --- Test Data Input
6 GND --- Ground
7 TMS --- Test Mode Select
8 GND --- Ground
9 TCK --- Test Clock
10 GND --- Ground
11 TDO --- Test Data Output
12 nSRST --- Ground
13 VCC ---
14 GND --- Ground
  • Flying Leads JTAG Cable
  • JTAG Connector Suppliers
  • JTAG Signals

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