TASKING iSYSTEM ST SPC58 4B Hardware User Manual page 11

J4 and J5: GND connecting points
In case of the emulation adapter usage, the solder part (IA100TQ-SOLDER or IA64ATQ-SOLDER)
is soldered instead of the microcontroller. Note that the available solder parts at the
introduction of this emulation adapter, did not provide support for the exposed GND pad. For
this reason, user must ensure replacement GND connection between the emulation adapter and
the target using a dedicated GND wire. Without this connection, the system will not work. Use
provided GND wire which comes along the emulation adapter and plug it to the pin J5 (see
picture above) on the emulation adapter. Connect the other side to the ground potential on the
target - as close as possible to the microcontroller respectively solder part being soldered
instead of the microcontroller. This connection must be quality and reliable otherwise
debugging and tracing over the Nexus trace port may not work. Alternatively, GND connection
can be also established over the J4 ground bridge
Capacitors C50 and C51, for which pads are provided on
the emulation adapter PCB, are not populated since the
microcontroller provides
capacitors for 20MHz/40MHz crystal oscillator operation.
Real target microcontroller in the QFP package provides an
exposed GND pad in the middle of the microcontroller at
the bottom side of the package. This provides GND
connection between the microcontroller and the target.
already the internal load