When you check your design, the Interface Designer applies design rules to your
configuration settings. The following tables show some of the error messages you may
encounter and explains how to fix them.
osc_rule_clock_name (error)
| Message |
Clock pin name is not specified Valid characters are alphanumeric
characters with dash and underscore only |
| To fix |
Specify a valid clock name. |
osc_rule_ena_pin_transceiver
(error)
| Message |
The
oscillator clock cannot be tri-state and has to be free running for
<transceiver type> usage |
| To fix |
Remove
the enable pin name. |
osc_rule_frequency (error)
| Message |
Invalid frequency <value> Unrecognized frequency
<value> |
| To fix |
The oscillator only supports 10, 20, 40, or 80 MHz frequencies, so
choose one of those. |
osc_rule_instance_count (error)
| Message |
There can only be one oscillator instance |
| To fix |
Topaz
FPGAs only have one oscillator, so you can only use
one oscillator block. |
osc_rule_inst_name (error)
| Message |
Instance name is empty Valid characters are alphanumeric characters
with dash and underscore only |
| To fix |
Specify a valid instance name. |
osc_rule_resource (error)
| Message |
Resource name is empty Resource is not a valid oscillator device
instance |
| To fix |
Although Topaz
FPGAs only have one oscillator, you still need to
choose the resource when you create an oscillator block. |