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Appendix D: Troubleshooting
30
Q: What are the limitations in probing Actel devices using Silicon
Explorer?
A: Probing limitations are described in Table D-1. Note that --
indicates that the feature is unavailable, and * indicates that the
feature only applies to devices that have Qclock.
Family
a
ACT1
/40MX
ACT2/XL/42MX
ACT3
DX/42MX
SX/SX-A/eX
a. For old ACT1 devices (specifically A10xx, A10xxA, some A10xxB, all TI
material, and Military ACT1) the probed signal is inverted. We do not have a
specific break point in the lot numbers for A10xxB devices, however if you
provide the lot number to us, we will try to determine if that lot has inverted probe
signals. Of course the best way to know for sure is to probe the output of an input
buffer and compare the Silicon Explorer reading with the applied value.
b. QCLKINT signal is inverted and may be swapped with an adjacent quadrant as
described in the following Guru document:
http://www.actel.com/apps/guru/oct98/hw1668.html
c. QClock probe ability for SX-A is currently disabled but may become available
in the future.
Table D-1. Probing Limitations
Input
Clock
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Probe Capable
Hclock
--
--
Y
--
N
Qclock
--
--
--
b
Y*
c
N*
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