Depending on the configuration of the clock source type of the input clock
the clocking wizard will instantiate all kinds of buffers on the input
clock signal.
For these particular projects there is no need to add any kind of buffer
since the source is already coming from a global clock buffer. So set the
configuration accordingly.
Avoids the following warning:
[Opt 31-32] Removing redundant IBUF since it is not being driven by a
top-level port. i_system_wrapper/system_i/sys_audio_clkgen/inst/clkin1_ibufg
Resolution: The tool has removed redundant IBUF. To resolve this
warning, check for redundant IBUF in the input design.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
There is no need for the audio clock to be phase aligned to its source
clock. When phase alignment is disabled the MMCM uses an internal feedback
path without requiring external resources, so disable it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Instead of manually specifying the input clock frequency let the core infer
it automatically. This makes it more straight forward to change the clock
frequency.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Neither the reset nor the locked signal is used in this design, so disable them. Avoids warnings about unconnected pins.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Depending on the configuration of the clock source type of the input clock
the clocking wizard will instantiate all kinds of buffers on the input
clock signal.
For these particular projects there is no need to add any kind of buffer
since the source is already coming from a global clock buffer. So set the
configuration accordingly.
Avoids the following warning:
[Opt 31-32] Removing redundant IBUF since it is not being driven by a
top-level port. i_system_wrapper/system_i/sys_audio_clkgen/inst/clkin1_ibufg
Resolution: The tool has removed redundant IBUF. To resolve this
warning, check for redundant IBUF in the input design.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
There is no need for the audio clock to be phase aligned to its source
clock. When phase alignment is disabled the MMCM uses an internal feedback
path without requiring external resources, so disable it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Instead of manually specifying the input clock frequency let the core infer
it automatically. This makes it more straight forward to change the clock
frequency.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The input clock frequency of the axi_clkgen was changed from 200 MHz to
100 Mhz. Update the divider settings accordingly to keep the standard
default output frequency of 148.5 MHz.
The incorrect divider settings did not affect operation of the design since
software reprograms them at startup anyway, but changing them avoids the
following warning:
[DRC 23-20] Rule violation (AVAL-46) v7v8_mmcm_fvco_rule1 - The current computed target frequency, FVCO, is out of range for cell i_system_wrapper/system_i/axi_hdmi_clkgen/inst/i_mmcm_drp/i_mmcm. The computed FVCO is 445.455 MHz. The valid FVCO range for speed grade -1 is 600MHz to 1200MHz. The cell attribute values used to compute FVCO are CLKFBOUT_MULT_F = 49.000, CLKIN1_PERIOD = 10.00000, and DIVCLK_DIVIDE = 11 (FVCO = 1000 * CLKFBOUT_MULT_F/(CLKIN1_PERIOD * DIVCLK_DIVIDE)).
This violation may be corrected by:
1. The timer uses timing constraints for clock period or clock frequency that affect CLKIN1 to set cell attribute CLKIN1_PERIOD, over-riding any previous value. This may already be in place and, if so this violation will be resolved once Timing is run. Otherwise, consider modifying timing constraints to adjust the CLKIN1_PERIOD and bring FVCO into the allowed range.
2. In the absence of timing constraints that affect CLKIN1, consider modifying the cell CLKIN1_PERIOD to bring FVCO into the allowed range.
3. If CLKIN1_PERIOD is satisfactory, modify the CLKFBOUT_MULT_F or DIVCLK_DIVIDE cell attributes to bring FVCO into the allowed range.
4. The MMCM configuration may be dynamically modified by use of DRP which is recognized by an ACTIVE signal on DCLK pin.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Calculate the output clock frequencies based on the input clock frequencies
and the default divider settings and configure the output clock pins
accordingly. This allows connected peripherals to infer the frequency of
the clock.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Instead of having to manually specify the input clock period infer the
values from the block design. This means that less configuration parameters
need to be changed if the clock input frequency changes.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Add interface definition for the input and output clocks. This will allow
the tools to recognize them as clocks and enable things like clock
frequency propagation.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The secondary clock inputs and outputs of the axi_clkgen are rarely used.
Add enable parameters that need to be explicitly set before they are
available. This allows to hide the secondary clock pins when they are not
used in the block design.
There are currently no projects which use the secondary clock inputs or
outputs so there is no need to set these new parameters anywhere.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Vivado infers the type of floating point type parameters as integer if the
value can be expressed as an integer (i.e. decimal places are 0). To
correctly infer them as floating point parameters add types to the
parameter declaration.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
There is no need for the audio clock to be phase aligned to its source
clock. When phase alignment is disabled the MMCM uses an internal feedback
path without requiring external resources, so disable it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Depending on the configuration of the clock source type of the input clock
the clocking wizard will instantiate all kinds of buffers on the input
clock signal.
For these particular projects there is no need to add any kind of buffer
since the source is already coming from a global clock buffer. So set the
configuration accordingly.
Avoids the following warning:
[Opt 31-32] Removing redundant IBUF since it is not being driven by a
top-level port. i_system_wrapper/system_i/sys_audio_clkgen/inst/clkin1_ibufg
Resolution: The tool has removed redundant IBUF. To resolve this
warning, check for redundant IBUF in the input design.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Instead of manually specifying the input clock frequency let the core infer
it automatically. This makes it more straight forward to change the clock
frequency.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Can not be multiple 'if' statements inside a generate block. If there are
multiple cases use if/esle statement, but always should be one single
if/else inside a generate.
Istvan Csomortani
Adrian Costina
Lars-Peter Clausen