4.3 Debug Connector (DBG)
The Debug Connector serves a dual purpose, depending on the "debug mode", which can be set up using Simplicity Studio. In the
"Debug IN" mode this connector allows an external debug emulator to be used with the on-board EFM32. In the "Debug OUT" mode
this connector allows the kit to be used as a debugger towards an external target. In the "Debug MCU" (default) mode this connector is
isolated from the debug interface of both the Board Controller and the on-board target device.
Because this connector is automatically switched to support the different operating modes, it is only available when the Board Controller
is powered (J-Link USB cable connected). If debug access to the target device is required when the Board Controller is unpowered, this
should be done by connecting directly to the appropriate breakout pins.
The pinout of the connector follows that of the standard ARM Cortex Debug+ETM 19-pin connector. The pinout is described in detail
below. Note that when using the on-board debugger to debug an mcu on an external board, JTAG and ETM functionality is only availa-
ble if the target device supports it.
1
2
4
8
6
10
5
9
12
13
14
11
15
16
17
18
20
19
TMS / SWDIO / C2D
TCK / SWCLK / C2CK
TDO / SWO
TDI / C2Dps
TRACECLK
TRACED0
TRACED1
TRACED2
TRACED3
RESET / C2CKps
GND
NC
NC
GND
GND
GND
7
GND
VTARGET
Cable Detect
NC
3
Figure 4.3. Debug Connector
Note that the pin-out matches the pin-out of an ARM Cortex Debug+ETM connector, but these are not fully compatible as pin 7 is physi-
cally removed from the Cortex Debug+ETM connector. Some cables have a small plug that prevent them from being used when this pin
is present. If this is the case, remove the plug, or use a standard 2x10 1.27 mm straight cable instead.
Table 4.4. Debug Connector Pin Descriptions
Pin number(s)
Function
Note
1
VTARGET
Target reference voltage. Used for shifting logical signal levels between target and
debugger.
2
TMS / SDWIO / C2D
JTAG test mode select, Serial Wire data or C2 data
4
TCK / SWCLK / C2CK JTAG test clock, Serial Wire clock or C2 clock
6
TDO/SWO
JTAG test data out or Serial Wire Output
8
TDI / C2Dps
JTAG test data in, or C2D "pin sharing" function
10
RESET / C2CKps
Target device reset, or C2CK "pin sharing" function
12
TRACECLK
ETM Trace Clock
14
TRACED0
ETM Trace Data 0
16
TRACED1
ETM Trace Data 1
18
TRACED2
ETM Trace Data 2
20
TRACED3
ETM Trace Data 3
9
Cable detect
Connect to ground
11, 13
NC
Not connected
3, 5, 15, 17, 19
GND
UG287: EFM32 Giant Gecko GG11 Starter Kit User's Guide
Connectors
silabs.com
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