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TC1784
General Purpose Timer Array (GPTA
®
v5)
User´s Manual
21-14
V1.1, 2011-05
GPTA
®
v5, V1.14
compensated or uncompensated PLL clock or can be the PLL clock of the other
GPTA
®
v5 units. The uncompensated PLL clock is useful in applications in which bursts
(due to acceleration) might disturb the filter function.
With a prescaled GPTA
®
v5 module clock, very long time filter time periods can be
achieved.
Note: All filter operation are always synchronously to
f
GPTA
. Therefore the further signal
analysis (e.g. glitch detection) is not processed on the rising edge of the selected
filter clock CIN, but on the next rising edge of
f
GPTA
following the rising edge of
selected CIN (gated clock principle). Therefore CIN clock rates above
f
GPTA
will
lead to non deterministic behavior.
Output Signal Splitting
Two output lines are provided by each FPC cell as follows:
•
An trigger output signal SOTk, reporting a falling or rising signal edge on the FPC
input by a single
f
GPTA
clock pulse,
•
A level output signal SOLk, indicating the direction of the detected signal transition.
This signal-splitting scheme (pair of trigger and level output) provides subsequent PDL
and DCM cells with the information about an input signal transition in the same
f
GPTA
clock cycle. This feature avoids cascading a one clock delay per edge detection circuitry
implemented at the input of each subsequent cell.
shows the FPC output
signal splitting scheme.
Figure 21-5 FPC Output Splitting into Trigger and Level Information
MCT05914
f
GPTA
FPC Level
Output SOLk
FPC Trigger
Output SOTk
FPC Input
SINk
Содержание TC1784
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