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Flash Programmer Model TFP2 User’s Manual
8
8 TROUBLESHOOTING
Proper function of the TFP2 with the target IC depends on many factors. These factors are:
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Cable length and cable quality
Signal termination
Target board and target IC function
Match between selected flash program size and target flash size
When the programming process seems to fail, it is useful to watch the feedback messages from the TFP2
via HyperTerminal. Using the C and/or T commands it can be determined quickly if the issue is with the
communication link or somewhere else.
8.1 COMMUNICATION ERRORS
The typical response of the TFP2 to a communication error when issuing the C command looks as
follows:
>C
Comparing Target Flash to TFP2 EEPROM image
Command timeout.
Command timeout.
FAIL
>
The response to the T command will look as follows when the communication link is interrupted:
T
Command timeout.
>
Likely causes for communication link issues are:
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Cable length – try to keep the cable length below 25 cm (10 inches)
Cable quality – proper multiple grounding and straight cables without loops are preferred. Try to
use the original ribbon cable with an adapter to the target programming connector, if necessary.
If the TFP2 and the PC connected to it have a different ground potential than the target, ground
loops can occur. In that case, try to use an isolated supply for the target.
Termination – in-line resistors, pull-up resistors (if used) and bypass capacitors should be in-
cluded in the target schematics in the same way as implemented on the Teridian Demo Boards.
Consult the Demo Board schematics for comparison.
Target board power – 3.3 VDC must be supplied to the target IC.
Target oscillator – ensure that the crystal is oscillating at 32.768 kHz using an oscilloscope. In
many cases, board contamination or moisture can prevent the oscillator from functioning properly.
ICE_E not pulled high – this pin, if available on the target IC, must be pulled high.
V1 pin for 71M651x target ICs – for this IC family, the V1 pin must be pulled up to 3.3 VDC to dis-
able the internal watchdog timer.
Stuck RESET pin – the communication link will fail if this pin is tied to the active potential.
Some older TFP2 units may have timing issues when programming 78M66xx devices. See Section 2.3 .
Revision 2.3
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