Cronologic xTDC4, Руководство пользователя

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window as shown in Figure 2.5 will appear. The tool can be used for updating the firmware
and to create a backup of the on-board calibration data of the xTDC4 unit. If several boards
are present, the one which is going to be used can be selected in the upper left corner of the
window. Pressing the “Backup” buttons a backup of the firmware or the calibration data will be
created, respectively. In order to perform a firmware update, chose the “.cronorom”-file to used
by pressing “Browse”. The file contains the firmware data. By pressing “Flash” the firmware is
written to the board. “Verify” can be used to compare the firmware data stored on the xTDC4
to the one inside a file. “Flash All” and “Verify All” perform the corresponding operation on
all boards which are installed.
Figure 2.5: The firmware update and calibration data backup tool as provided with the xTDC4
device driver.
Important note: The new firmware will only be used after a power cycle, i.e. after switching
the PC (or Ndigo crate) off and back on. A simple reboot is not sufficient. Therefore the
information shown in the upper half of the application window does not change right after
flashing a new firmware.
2.5 Calibrating the Carry-Chain TDC
After each update of the xTDC4 firmware the Carry-Chain TDC has to be calibrated. Before
calibration make sure to power-cycle the system after updating the xTDC4 firmware. The
calibration is done with the tool “XTDC4Calibration.exe” (see Figure
2.6 ) which is available
after installing the xTDC4 device driver. Connect an external pulse signal to the Start and
channel inputs. The signal should be low active. The pulse low and high width has to be
at least 10ns each. Use “Calibrate” to start the calibration procedure. Follow the on-screen
instructions to gather calibration data on all channels. When all channels are calibrated use
“Write” to permanently store the calibration data in the xTDC4’s on-board flash.
cronologic GmbH & Co. KG 6 xTDC4 User Guide