TASKING iSYSTEM ST SPC58 2B Hardware User Manual page 11

Emulation adapters of revision A3 or lower had capacitors C37 and C38 populated with
10p.
J4 & 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 introduc-
tion 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 J6 (see pic-
ture above) on the emulation adapter. Connect the other side to the ground potential on the tar-
get - 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 es-
tablished over the J4 ground bridge.
Capacitors C37 and C38, for which pads are provided
on the emulation adapter PCB, are not populated since
the microcontroller provides already the internal load
capacitors for 20MHz/40MHz crystal oscillator opera-
tion.
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 con-
nection between the microcontroller and the target.