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+ tdc\_v2.2* & 08.03.2015 & Faster clock (400 MHz) for the delay line is used. \\
+\hline
+ tdc\_v2.1.4 & 17.06.2015 & Several bug fixes for the stretcher option. \\
\hline
tdc\_v2.1.2 & 28.01.2015 & In case of a missing reference time a header error bit is set and DAQ keeps running. \\
& & Grass hits in ToT with calbration trigger is removed. The ToT mean value - 10ns gives the stretching offset of the channel. \\
& & Channel invert bits are implemented. \\
& & Trigger window bugfix. \\
+ & & Resource usages in Channel_200 and Channel entity are decreased. \\
+ & & Hit detection is increased to 2 bits. \\
+ & & Coarse counter number is increased to channel number for better timing. \\
+ & & Instead of the internal oscillator 125MHz clock input is used for the calibration. \\
\hline
tdc\_v2.1.1 & 28.01.2015 & The dead time of the TDC is decreased to 20ns. \\
& & Small bug with ``Light Mode'' is removed. \\