General Description: Why do I encounter an error with the fitter that says my reset signal cannot be assigned to the global reset pin on XPLA2 devices?
Any signal can be assigned to the global reset pin in XPLA2 devices and applied to all macrocells as an asynchronous reset. This signal is not routed through any logic or the ZIAs, but comes directly from this pin.
The global reset is "active low," which means that the signal should be negated to the flip-flop. If the equation for the flip-flop reset appears to be "active high," an error occurs in the fitter, saying that the specified signal cannot be assigned to the global reset. The reset signal is assigned to the global reset pin by the pin assignment in the control file.