Using Design Entry HDL designs in Allegro System Capture
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XNet Creation in DML-Independent Mode
XNet creation can be done in two ways in the DML-independent mode. These can be pre-
configured in the SITE area so that all the projects follow the same mode of operation.
When a new design is created, the mode is read from the SITE area and established for
the design. The modes of operation are:
• Automatic XNet creation across discrete devices when the devices are added to the
design
In the Automatic XNet creation mode:
❖ XNets are created automatically between pins of a discrete device.
❖ XNets can also be created between pins of non-discrete devices by adding
the XNET_PINS pin-level property.
o Pins of a component instance with the same value of
the property would create a single XNet
❖ XNets are not created automatically when:
o The component is not a discrete device
o Any of the pins are connected to a DC Net
o Pin limit is exceeded; the default maximum is 25 pins
o NO_XNET_CONNECTION property is found on the
instance
• Manual XNet creation across discrete devices
In case of manual XNet creation mode:
❖ XNets are not automatically created between the pins of a discrete device.
❖ XNets can be created between pins of devices by adding the XNET_PINS
pin-level property o Pins of a component instance with the same value of
the property creates a single XNet
❖ In this mode, even if the XNET_PINS property is defined, XNets are not
created when:
o Any of the pins are connected to a DC Net
o Pin limit is exceeded; the default maximum is 25 pins
o The NO_XNET_CONNECTION property is found on
the instance
