Altera quartus ii output pins stuck at vcc or gnd

#Altera quartus ii output pins stuck at vcc or gnd how to

You can fire it up right from Quartus and its GUI is pretty straight forward, giving you nice drop-downs for signals & pins etc. 20Warning: Following 4 pins have nothing, GND, or VCC driving datain port. 19Warning: Following 1 pins have no output enable or a GND or VCC output enable - later changes to this.

#Altera quartus ii output pins stuck at vcc or gnd how to

See PinPlanner manual for more information on how to do pin assignments. 19Warning: Following 1 pins have no output enable or a GND or VCC output enable - later changes to this. Most likely you have this problem because you are missing a connection for a signal, or you did not specify pin assignments. If you have that clock_enable stuck, everything that is driven by the clock that signal is gating can be pretty much optimized away. If synthesis tool determines that a signal from pin A is always 1'b1, then it can optimize your module away and just drive 1'b0 to the pin B.ДЇrom your description, it seems like data_in is an input to FPGA and clock_enable is some signal that gates the clock (i.e. For example, let's say your module is getting signal from pin A, inverts it and outputs to pin B. .PIN NUMBER SYMBOL FUNCTION 1 OE Output enable input (active-Low) 3, 4, 7, 8, 13, 14, 17, 18 D0-D7 Data inputs 2, 5, 6, 9, 12. Signals can either get stuck at GND (ground), meaning that they are always low (has a value of 1'b0) or they may stuck at VCC (positive supply voltage) when a signal is constantly asserted high (has a value of 1'b1).Д«ecause the signal is constant, synthesis tools is able to perform certain optimizations that could result in reduced logic up to the point when the whole design is optimized away. You get 'Stuck at GND' messages when synthesis tool determines that a particular signal is constant and is never changing.