ST20-JPI

8/10

®

3.5

TrigIn/TrigOut SMB Coaxial Connectors

The two coaxial SMB connectors to the left of the LEDs are used to connect the ST20-JPI to a

Logic Analyser. They are used to signal between the Host, Target and Logical Analyser when an

event occurs. If, for instance, an event occurs on the Target processor, the TrigOut signal is

triggered which could start the Logic Analyser tracing an external event, so aiding software/

hardware debugging.

3.6

Power Supply Connector

The ST20-JPI uses a 2.5mm power connector. The voltage range is 8-13V dc.

4

Recommended Target Circuitry

To ensure correct connection to the target processor, the following circuit should be used:

GND

TrigIn/Out

GND

+V

ST20

10K

TDI

TMS

TCK

notTRST

TrigIn

TrigOut

notRST

TDO

VCC

ST20-JPI

Target Board

Board PowerOnReset