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FIFO fill factor is indicated. This is useful when tuning a data-driven process to avoid FIFO overflow and
still get maximum efficiency from the experiment. For very long records, the maximum fill factor during
the record is given.
If there is an overflow in the FIFO on the digitizer, data will be lost. The
this.
OVER
FIFO
LOST DATA DESCRIPTION
RANGE
FILL
7
6 5 4 3 2 1 0
0
1
X X X
0 0 0 0 No lost data
1
1
Table 5:
Status.
7.9.3
User ID
User ID is a custom byte that can be set by the user. Set this parameter by the
command.
ers
7.9.4
Serial number
The serial number is the serial number of the ADQ hardware. The serial number is printed on a label on
the digitizer in the form "S/N SPD-04004". The serial number field is the number part, that is 04004.
7.9.5
Channel
This is an indication of from which channel the record originates. The first numbers of the channel
parameter are reserved for the physical channels. The remaining combinations are available for ADQ
Development Kit users to create artificial channels.
7.9.6
Record number
The Record number is counting the number of records captured from the power-up of the digitizer.
7.9.7
Data format
The header data parameter 'Data format'
values are given in
Table
VALUE
DESCRIPTION
0
16 bits data word in two's complement
1
32 bits data word in two's complement
Table 6:
Data formats
7.9.8
Record length
This is the length of the data record in number of bytes.
19-2302 A
2020-09-16
No over-range detected
Over/under-range detected
FIFO fill factor
1 Lost record
1
Lost data in beginning of the
record
Lost data in the middle of the
record
Lost data in the end of the
record
(Table
4) informs the user on how to interpret data. Allowed
6.
19-2302 A 2020-09-16
bits inform about
LOST_DATA
COMMENT
Anywhere in the data.
Steps of 12.5%. 111 means > 87.5% and
000 is below 12.5%.
The software has generated a header with
no data to indicate a lost record.
The start of the record is missing.
Timestamp information is also missing.
One or many section(s) anywhere inside the
data is missing.
EnableUseOfUserHead-
ADQ8-4X Manual
42(46)
42(46)
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