TDC data explaination is updated for better understanding

diff --git a/trb3/TdcDataFormat.tex b/trb3/TdcDataFormat.tex
index e22692ec243f8737c4ea3010dd259b72ebb28275..1eaf5059372bbb7e1463eb7adfd86c4b14c3c152 100644 (file)
--- a/trb3/TdcDataFormat.tex
+++ b/trb3/TdcDataFormat.tex
@@ -1,13 +1,5 @@
-In the data stream of the DAQ system, the TDC data starts with the TDC network
-header, for example "0xXXXXc0XX", "0xc0XX" indicating the address of the TDC
-in the system. The bits 4\textendash7 indicates the number of the TRB3 board
-in the system starting from 0 (This must be set up in the
-\textit{addresses\_trb3.db} file). The least significant 4 bits indicate the
-TDC number on the TRB3 board. It can alter between 1\textendash4. The number
-of words sent by the TDC is marked in the upper 16 bits, e.g., "0x0006c0XX"
-means, the next 6 words are from the TDC with the address XX. After the TDC
-header, the data is sent. 4 different kinds of words are sent by the TDCs;
-header, time data, debug and reserved.
+The TDC data consists of 4 different kinds of information: TDC header, time 
+data, debug, epoch counter and reserved.
 
 \subsubsection{TDC HEADER}
 
@@ -192,12 +184,10 @@ The EPOCH counter is designed with 28 bits increasing the total measurement
 range up to $\sim$45,8~min. For each channel an individual EPOCH counter is
 implemented and they are incremented, when the coarse counter wraps
 around. The value of the EPOCH counter is kept in a register before it is
-written in the channel memory. It is only written in the memory, if a time
-measurement takes place after the last increment of the EPOCH counter. The
-EPOCH counter word is written in the memory only once per channel for each
-increment, thus saving bandwidth. In order to be on the safe side and not
-overflow the EPOCH counter, the readout trigger frequency can be set minimum
-to 24~Hz.
+written in the channel memory. It is written once per event per channel and 
+only updated, if a time measurement takes place after the last increment of the 
+EPOCH counter. In order to be on the safe side and not overflow the EPOCH 
+counter, the readout trigger frequency can be set minimum to 24~Hz.
 
 
 \subsubsection{RESERVED}