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*Home > Technical Support > FAQs > Development Tool FAQs > Do I need to connect DBGREQ and DBGACK to the 20-pin JTAG connector?
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downarrowDo I need to connect DBGREQ and DBGACK to the 20-pin JTAG connector?
Applies to: JTAG Debug Issues, Multi-ICE, RealView ICE (RVI)

The DBGRQ and DBGACK pins of the 20-pin JTAG connector are not used by ARM's debug tools. Instead, the tools access those signals inside of the core via JTAG.

The Multi-ICE hardware makes no connection to the DBGRQ and DBGACK signals internally. Inside the RVI unit, these signals are connected to the FPGA, but this functionality is not implemented in the RVI firmware or in the RVD debugger.

DBGRQ and DBGACK were added to the 20-way JTAG connector specification so that they could be used by third-party JTAG tools.

When using ARM brand debug tools, you do not need to route DBGRQ and DBGACK to pins of the ASIC. Instead you can just pull DBGRQ low inside of the ASIC and DBGACK high or low at the JTAG connector.






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