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xCORE-200 Clock Frequency Control
Attribute
Oscillator
SystemFrequency
Figure 6:
XN File
Frequency
ReferenceFrequency
Control
Attributes
example 500MHz, 24576kHz or 6745800Hz). If the frequency control attributes
are not specified in the XN file, then the xTIMEcomposer tools will not modify the
frequency control registers.
If the target frequency specified in the XN file for either the system or reference
frequency cannot be met exactly for the application's input frequency, a frequency
close to the target frequency will be selected by the tools and a warning will be
issued. XFLASH always issues the warning when it occurs, as does XGDB. XRUN
only issues the warning if it has been run with the --verbose switch. XGDB issues
the warning when the connect command is issued. Within xTIMEcomposer Studio,
the XFLASH warning is issued to the Console, but the XGDB or XRUN warning is not
available to the user.
XM010761A
Description
Input frequency on the CLK pin. If this
attribute is specified, the system fre-
quency and the reference frequency are
programmed using their specified (or de-
fault) values. If this attribute is not speci-
fied, the boot configuration for the system
and reference frequencies are used for the
application.
The desired system frequency. The Os-
cillator attribute must be specified if this
attribute is specified.
The desired reference frequency. The Os-
cillator attribute must be specified if this
attribute is specified.
6/8
Default Value
Uses boot configu-
ration
400MHz
100MHz
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