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Q

How is the target reset of the JTAG connected correctly?

Connector ARM20 and FTDI

ARM20 features two reset signals: The test reset and the system reset. Both have to be connected to netx 90.

netX 90 pinJTAG adapter
ARM20
JT_TRSTTRST-
RST_IN_NSRST-
MIPI20

The MIPI20 adapter has only one RESET- signal available.

The RESET- pin of the MIPI 20 connector is connected to the system reset (analog to JTAG ARM20 SRST-) to the netx 90 RST_IN_N pin.

Because the netX 90 JT_TRST signal resets only the JTAG debug domain, this pin remainbs unconnected in case of JTAG MIPI 20 connector.

netX 90 pinJTAG adapter
MIPI 20
RST_IN_NRESET-


Connectors

The following table illustrates the pinning of the debug connectors.


ARM 20

MIPI 20 Narrow

Coresight 20 JTAG

Coresight 20 SWD
Example Image

CommentNXHX 90 - JTAG (Rev 1/Rev 2)NOT USEDNXHX 90 - JTAG (Rev 3/Rev 4) with tracing disabledNXHX 90 - JTAG (Rev 3/Rev 4) with tracing enabled

Pinning

Pinning:

SignalPinPinSignal
VTREF12VSUPPLY
TRST-34GND
TDI56GND
TMS78GND
TCK910GND
RTCK1112GND
TDO1314GND
SRST-1516GND
DBGRQ1718GND
DBGACK1920GND

Pinning:

SignalPinPinSignal
VREF_DEBUG12TMSC
GND34TCKC
GND56EXT
GND78BCE
GND910RESET-
GND1112TRC_CLK
GND1314TRC_DATA0
GND1516TRC_DATA1
GND1718TRC_DATA2
GND1920TRC_DATA3

Pinning:

SignalPinPinSignal
VREF_DEBUG12TMS
GND34TCK
GND56TDO
GND78TDI
GND910RESET-
GND1112TRC_CLK
GND1314TRC_DATA0
GND1516TRC_DATA1
GND1718TRC_DATA2
GND1920TRC_DATA3

Pinning:

SignalPinPinSignal
VREF_DEBUG12SWDIO
GND34SWCLK
GND56SWO
GND78N/C
GND910RESET-
GND1112TRC_CLK
GND1314TRC_D0
GND1516TRC_D1
GND1718TRC_D2
GND1920TRC_D3

Converter for ARM 20 to Coresight 20 JTAG:

See http://www2.lauterbach.com/pdf/app_arm_jtag.pdf

LA-3770 Converter ARM-20 to MIPI-10/20/34

JUMPER/Solder Bridges might have to be changed to: CORESIGHT-20-JTAG