Answers Database
XPLA Professional: Fitter errors when reset signal cannot be assigned to the global reset pin on XPLA2 devices.
Record #7529
Product Family: Software
Product Line: CoolRunner
Product Part: XPLA Fitter
Problem Title:
XPLA Professional: Fitter errors when reset signal cannot be assigned to the global reset
pin on XPLA2 devices.
Problem Description:
Urgency: Standard
General Description: Why does the fitter error specifying my reset signal
cannot be assigned to the global reset pin on XPLA2 devices?
Solution 1:
Any signal can be assigned to the global reset pin in XPLA2 devices and
is 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 the signal should be negated
to the flip-flop. If the equation for the flip-flop reset appears to be active
high, the fitter will error specifying 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.
End of Record #7529 - Last Modified: 10/11/99 17:29 |
