Datasheet
Emulator User’s Guide for MPLAB X IDE
DS52085A-page 114 2013 Microchip Technology Inc.
12.6 LOOP-BACK TEST BOARD
This board (included with DV244005) can be used to verify that the emulator is
functioning properly. To use this board:
1. Disconnect the emulator from the target and the PC.
2. Insert the standard driver board if it is not already installed.
3. Plug the loopback test board into the pod’s logic probe connector.
4. Connect the loop-back test board to the standard driver board using the modular
cable.
5. Reconnect the emulator to the computer.
6. Launch MPLAB X IDE. Ensure that all existing projects are closed.
7. Select Debug>Run Debugger/Programmer Self Test
, then, select the specific
“REAL ICE” you want to test and click OK.
8. Ensure the loopback test board and cable are connected and click Yes to
continue.
9. View the self test results in the emulator’s Output window.
10. After the emulator passes the self test, disconnect the loopback test board from
the emulator.
MPLAB IDE will detect and run the complete loop-back test and give you a status
(PASS/FAIL). The loop-back test board detection works by applying a short pulse on
EXT0 and detecting it on EXT7 on the logic probe connector (Section 12.4.4 “Logic
Probe/External Trigger Interface”). Once the board is detected, the emulator applies
stimulus to the clock/data and V
PP lines and reads the sequence back from the logic
probe connector interface, thus confirming proper signals levels and connectivity down
to the connector interfaces.
FIGURE 12-5: LOOP-BACK TEST BOARD CONNECTIONS
12.7 TARGET BOARD CONSIDERATIONS
The target board should be powered according to the requirements of the selected
device (1.6V-5.5V) and the application.
The emulator does sense target power. There is a 10 K load on V
DD_TGT.
Depending on the type of emulator-to-target communications used, there will be some
considerations for target board circuitry:
• Section 3.5.3 “Target Connection Circuitry”
• Section 3.5.4 “Circuits That Will Prevent the Emulator From Functioning”
Additional design considerations may be found in “Development Tools Design
Advisory” (DS51764).
Emulator
Pod
Standard Driver Board
Loop-Back Test Board
Modular Cable
Logic Probe Connector
Driver Board Slot
Note: The emulator cannot power the target.