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M32R Debugger and Trace 28 JTAG Connection

JTAG Connection

Mechanical Description of the 10-pin Debug Cable

This connector is defined by ARM and we recommend this connector for all future designs. Our debugger

“JTAG Debugger for StarCore” (LA-7845) is supplied with this connector:

This is a standard 10 pin double row connector (pin to pin spacing: 0.100 in.). We strongly recommend to

use a connector on your target with housing and having a center polarization (e.g. AMP: 2-827745-0). A

connection the other way around indeed causes damage to the output driver of the debugger.

Electrical Description of the 10-pin Debug Cable

• The input and output signals are 3.3 V TTL compatible.

VTREF is used as a sense line for the target voltage. It is also used as supply voltage for the

supply translating transceiver of the ICD interface to make an adaptation to the target voltage

(1.5 V) 1.8 … 3.3 V (3.6 V). On the newer debug cables (September 2003 and newer) it is used

as sense line, only.

•RST

, TDI, TMS, TCK: In normal operation mode the driver is enabled, but it can be disabled to

give another tool access to the JTAG port. In environments where multiple tools can access the

JTAG port, it is required that there is a pull-up or pull-down resistor at TCK. This is to ensure that

TCK maintains its level during a hand over between different tools.

• TDO is an ICD input. It is connected to the supply translating transceiver.

•RST

(reset) is used by the debugger to reset the target CPU or to detect a reset on the target. It

is driven by an open collector buffer. A pull-up resistor is included in the ICD connector. The

debugger will only assert a pulse on nSRST when the SYStem.UP, the SYStem.Mode Go or the

SYStem.RESetOUT command is executed.

• DBI is an output which can force the CPU into debug mode by hardware.

• VCCTRB is an output and supplies the trace date buffer on the target. Normally 1.8 V.

• N/C (= Vsupply) is not connected in the ICD. This pin is used by debuggers of other

manufacturers for supply voltage input. The ICD is self-powered.

Signal Pin Pin Signal

TCK 1 2 GND

TDI 3 4 TDO

TMS 5 6 TRST-

DBI 7 8 VCCTRB (trace buffer)

VCC 9 10 RST-

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 34

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