Chapter 7 SCPI
The communication-related subsystems
230 WCDMA Options Version 6.20
Example:
Continuing our example from above, in the related Event register, the corre-
sponding bit would still be set. A query of this register would provide evidence
that there has been some paging in progress. However, the Event register is not
able to provide any information if the condition is still valid.
Summary 1: condition-type versus event-type registers
– The condition-type registers reflects the current status of the test set and is
updated continuously. When you would like to know if a special condition is
currently valid, then read out the related condition-type register with a
query.
– The condition-type register and the event-type register have an identical
structure. This means that they are of the same length and the single indi-
cator bits are at the same positions.
– The event-type registers are the 'memory' of the status system. Once a bit
has been set, it will remain set until the event-type register is read out with
a query. When you want to trigger e.g. a RAPID! program with a certain
event, always read out the related event-type register.
– Event-type registers are read-only and self-destructive. They will be cleared
after any query.
Transition of a bit from the condition-type to the event-type register
How will a bit find its way to the Event register?
This depends on the transition filter and its settings. The transition filter works
as follows:
First, there are two branches: the Positive TRansition and the Negative TRansi-
tion filter. Both only react on the corresponding transitions of bits and both
contain as many bit positions as the condition register.
PTR will carry a binary 1 at a bit position only when the corresponding bit of the
condition register is set, while NTR will carry a binary 1 at a bit position only
when the corresponding bit of the condition register is reset..
Both the output of PTR and NTR will be combined with the corresponding mask,
using a logical AND operation.
These masks are user-definable (using the
STAT:xxxx:xTR commands) and
again contain as many bit positions as the condition register.
Example:
The only chance for bit 4 (that has just been set in the condition register) to
reach the Event register is that the PTR mask carries a binary
1 at bit position 4.
The logical AND between the PTR filter and the PTR mask will then deliver a
binary
1. This binary 1 will pass the logical OR and thus set bit 4 of the Event
register.
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