R&S PR100 User Manual
Figure 2: Status Register Model
NTRansition section
The Negative-TRansition section also acts as an edge detector. When a bit of
the CONDition section is changed from 1 to 0, the associated NTR bit decides
whether the EVENt bit is set to 1.
NTR-bit = 1: the EVENt bit is set.
NTR-bit = 0: the EVENt bit is not set.
This section can be written into and read from in any way. Its contents are not
changed during reading.
With these two edge register sections the user can define which state
transition of the condition section (none, 0 to 1, 1 to 0 or both) is stored in the
EVENt section.
EVENt section
The EVENt section indicates whether an event has occurred since the last
reading, it is the "memory" of the CONDition section. It only indicates events
passed on by the edge filters. The EVENt section is permanently updated by
the device. This part can only be read. During reading, its contents are set to
zero. This section is often regarded as the entire register.
ENABle section
The ENABle section determines whether the associated EVENt bit contributes
to the summary bit (see below). Each bit of the EVENt section is ANDed with
the associated ENABle bit (symbol '&'). The results of all logical operations of
this section are passed on to the summary bit via an OR operation (symbol
'1').
+
0
1
2
3
4
5
6
7
8
...
1
5
0
1
2
3
4
5
6
7
8
...
1
5
0
1
2
3
4
5
6
7
8
...
1
5
0
1
2
3
4
5
6
7
8
...
1
5
0
1
2
3
4
5
6
7
8
...
15
&
&
&
&
&
&
&
&
&
...
&
F 1
0
1
2
3
4
5
6
7
8
...
1
5
=
General Status Register
CONDition
P
TRan-
sition
N
TRan-
sition
EVENt ENABle
T
o a Higher-Order Register
& = logical AND
F 1 = logical OR of all
bits
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