Parameters Related To Csv; Check The Clock Specifications - Infineon XMC7000 Quick Start Manual

XMC7000: Setting the Clock Supervision (CSV) parameters

Parameters related to CSV

2 Parameters related to CSV
2.1

Check the clock specifications

Check the following clock specifications:
Reference clock frequency and tolerance (integer %)
•
Monitored clock frequency and required tolerance (integer %)
•
The required monitored clock tolerance should be equal to or larger than the reference clock tolerance.
In case if the monitored clock is FLL, PLL200, or PLL400, set the nominal frequency (Fc) of configured VCO
−
or PLL400 output for fractional mode, or SSCG in down spread mode to the monitor clock frequency. See
SID341/SID341A(4)/SID341B(4)/SID351 in the
The maximum frequency is reduced in PLL400 with SSCG/fractional mode.
If the monitored clock is PLL200 or PLL400 without SSCG/fractional mode, set '3 or more' in
−
consideration of the PLL jitter to monitored clock tolerance.
If the monitored clock is PLL400 with SSCG/fractional mode, set '5 or more' in consideration of the PLL
−
jitter to monitored clock tolerance as shown in
If the monitored clock is PLL400 with SSCG mode, set the modulation depth according to your
−
configuration.
Fc
Fc: Nominal frequency of configured VCO or PLL400 output for SSCG in down spread mode
Figure 2 PLL clock frequency tolerance
Maximum startup time for the monitored clock except for WCO.
•
In the case of WCO, the startup time is unused (0). CSV should be enabled after WCO is started
(BACKUP_STATUS.WCO_OK = 1).
In the CSV calculator, enter the values given in the column highlighted in orange in
clock tolerance is smaller than the reference clock tolerance, the 'Value' cell of the monitored clock tolerance
will be highlighted in red.
Application note
device datasheet
Figure
Modulation rate
( 1 / Modulation_frequency)
for the maximum frequency.
2.
Modulation
depth(ΔF)
4
Jitter
Time
Table 1. If the monitored
002-34390 Rev. *A
2023-06-05