Full Suppression based on the Amplitude of the Signal
Full Suppression based on the signal amplitude (ZS_AMP) allows the user to discard data from one chan-
nel if the signal does not exceed the programmed threshold for at least Ns subsequent data. Threshold
and Ns can be defined through registers 0x1n24 and 0x1n28 respec vely
, and Ns is programmable
specifically by register address 0x1n28.
It is also possible to define a logic of acquisi on according to bit[31] of register 0x1n24. In case of posi ve
logic, the condi on is met when the data is over threshold; in case of nega ve logic, the condi on is met
when the data is under threshold.
Fig.
shows an example of ZS_AMP in case of 4 channels. Channel 0 and channel 2 are over ZS_Threshold
(T
AMP
) for at least Ns samples (N
OVT
) and the corresponding channels are wri en in the output data. Sam-
ples from channel 1 are not over-threshold, and samples from channel 3 are over-threshold for less than
Ns samples. The la er two channels are not recorded.
Acquisition Window
Common Trigger
Ns
CH0
Acquisition Window
CH1
Acquisition Window
CH2
Acquisition Window
CH3
N
OT
> Ns
The event
is acquired
N
OVT
N
OT
> Ns
The event
is acquired
T
AMP
Ns
N
OVT
T
AMP
N
OT
< Ns
The event is
not acquired
Ns
N
OVT
T
AMP
Signal is not
over-threshold:
The event is
not acquired
T
AMP
Common Trigger
Common Trigger
Common Trigger
OUTPUT DATA:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
H
E
A
D
E
R
D
A
T
A
C
H
0
D
A
T
A
C
H
2
. . .
. . .
. . .
Channel
Mask
= 0x5
Fig. 7.6:
Zero Suppression based on the amplitude.
UM3247 - N6724 User Manual rev. 10
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