Pixie-32 User Manual
Version 0.2
parameters. However, for all options the following 4 words will always be included in the event header as
the first 4 words.
I
n
d
e
x
Data
Description
0
[31] [30:29]
[28:15
]
[14:10]
[9:6
]
[5:0]
Bits [5:0]
– channel number;
bits
[9:6]
– module number;
bits [14:10]
– header length, 4 B words;
bits [28:15]
–
event length, 4 B words (trace);
bits [30:29]
–
crate number; ;
bit [31]
– neutron flag (0 – not neutron
event; 1 – neutron event)
Neu
tron
Fla
g
CrateID
Event
Length
Header
Length
Mod
ID
Chan
#
1
[31:0]
Event time (lower 32-bit of the 48-bit timestamp)
recorded by the signal processing FPGA
EVTTIME_LO[31:0]
2
[31]
[30:16]
[15:0]
Bits [15:0]
– event time (upper 16-bit of the 48-bit
timestamp);
bits [30:16]
– trace start address,
unused;
bit [31]
– event finish code (0 – good event;
1 – piled-up event)
Finish
Code
Trace Start
Address[14:0]
EVTTIME_HI[15:0]
3
[31]
[30:16]
[15:0]
Bits [15:0]
– event energy;
bits [30:16]
– trace
length, 4 B words (2 ADC samples per word)(0 if no
trace is recorded);
bit [31]
– trace out of range flag
Trace
Out-of-Range
Flag
Trace
Length
Event Energy
The following sections illustrated different output data options.
●
Recording of QDC sums ENABLED
Index
Data
Description
4
[31:0]
QDC sum #0
QDCSum0
5
[31:0]
QDC sum #1
QDCSum1
6
[31:0]
QDC sum #2
QDCSum2
7
[31:0]
QDC sum #3
QDCSum3
●
Recording of trace ENABLED
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