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A5 If the Waveform window is open but it is not connected or powered up, then the
system is constantly timing out looking for a response. Either close the Waveform
window or change the COM port to DEMO.
Q1 The Analyze module acquires data and then indicates errors on read-back. Why?
A1 The Analyze module bursts data back in blocks at high speeds, with built-in retry
for a bad block (it uses both checksum and byte count). Some third-party serial
programs block all interrupts, forcing the analyzer into a retry loop. Some laptops
power down the UART and drop a few characters. Try disabling “Power Saving” in
the CMOS setup menu.
Q When the Explore window is open, my other Windows programs run slowly. Why?
A If the Explore window is open but not connected or powered up, then the system is
constantly timing out looking for a response. Either close the SE II window or
change the COM port to DEMO.
Q I get a message “Device Timed out” when I try to assign a particular signal to the
Probe pins. Why?
A This message gives us an indication that the power is not sufficient for the Silicon
Explorer and as a solution you would have to add a separate power source for the
Silicon Explorer. Refer to Powering Silicon Explorer II for more information.
Q I have assigned an internal signal to PRA and PRB but the PRA and PRB light is not
blinking on the Probe Pilot. Is this normal?
A The PRA and the PRB light on the Probe Pilot are just an indication of the logic level
of that assigned internal signal. If the assigned internal net is at permanent logic 0,
the light on the Probe Pilot for the corresponding probe will not glow.
Q Where are my TMS and SDO pins?
A Your cable will not have the TMS and the SDO pins if it was bought before the SX
probing capability was introduced. To order a new cable (Si-Ex-Ribbons), contact
Actel customer service at Customer.Service@actel.com.
Q Is the Silicon Explorer displaying an incorrect signal?
A Make sure that the signal is sampled at a sufficiently high frequency. The sampling
rate should be at least twice the frequency of the fastest changing signal. The
maximum frequency at which the signal can be sampled is 100 MHz which limits the
frequency of the device to 50 MHz. If a higher sampling frequency is required than
the PRA and the PRB pins can be connected to a logic analyzer to view the signals.
44
Silicon Explorer II User's Guide
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