6.6.1. Adaptor to connect a Multi-ICE interface unit to 14-way connectors

The 14-way socket on the adaptor board plugs into a target board with the older header, and the Multi-ICE ribbon cable is connected to the 20-way header on the adaptor board.

The three-pin header J3 has the following connections:

Pin 1

0V, Gnd.

Pin 2

Multi-ICE connector pin 2, Vsupply.

Pin 3

Target connector pin 1, SPU.

The jumper link supplied on the adaptor board connects pins 2 and 3 so that the Multi-ICE interface unit draws its power from the target system in the normal manner. If the target system cannot source a suitable voltage or current, an external 2V to 5V DC supply can be connected to pins 1 and 2.

The three-pin header J4 has the following connections:

Pin 1

0V.

Pin 2

Multi-ICE connector pin 11, RTCK.

Pin 3

Resistor fed by Multi-ICE connector pin 9, TCK.

The jumper link supplied on the adaptor board connects 0V back to the Multi-ICE RTCK input. If the target system is to use adaptive clocking, TCK can be tapped off here, and the synchronized version used to clock the target can be fed back as RTCK.

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