Actel Silicon Explorer II Quick Start Manual page 17

To verify the checksum:
Click on the Checksum button. Once you open a Probe file and make
a device connection, read the checksum of the target device and
compare it to the checksum in the Probe file by double-clicking the
Checksum button. Table 5 lists and explains the error messages.
Table 5. Checksum Error Messages
Error Message
Checksum: 383A v.s. ????
Checksum: 383A v.s. 0000
To probe a node:
1. Select the desired signal from the tree by clicking the net
name (see Figure 2).
2. Click the PRA or PRB button. Silicon Explorer II routes the
selected node to the probe pin and switches the corresponding
analyzer input to the probe connector. The Analyze module
displays the net name.
The user can modify the tree information to reflect the design's internal
net names or pin names by right-clicking the Nets icon and selecting
Using the Command Module
Explanation
Checksum is not readable because the probe
is disconnected or not powered.
The checksum does not match the file.
or
The SDO/TDO probe-side pin is not properly
connected to the device. Please see Table 2
on page 5 for the proper connection.
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