LED lights flashing while LCD shows chars, Spartan-3A

I am trying to look for information on the "Spartan-3A FPGA Starter
Kit Board User Guide" and other sites regarding to this problem I am
having. One of the requirements of my program is to display a number,
each second, on the Spartan-3A LCD.

I see that some LEDs are flashing, while the LCD shows the numbers. I
have not commanded that in the program. I understand that this must be
happening because something is failing (perhaps because of the way I
described the circuit/programmed).

My question is:
Do you know where can I find information that tells, for example, what
means an  'on'  LED0 and/or LED3, from time to time, while the LCD is
showing the characters?



Thank you,
m  m

> My question is:
> Do you know where can I find information that tells, for example, what
> means an  'on'  LED0 and/or LED3, from time to time, while the LCD is
> showing the characters?

I looked at the Spartan-3A Starter Kit board schematic, but it does not 
appear that the character LCD pins are shared with the LEDs.
http://www.xilinx.com/support/documentation/boards_and_kits/ug334.pdf

Do you have other outputs in the design?  Are those output pins defined a 
LOCation in the UCF file?  It could be that output pins with an unassigned 
pin location are landing on the LED pins.

===============================================
Steven K. Knapp
Prevailing Technology, Inc.
Web:  www.prevailing-technology.com 

Thanks for the hint.

I tried with a different design/programming, this time declaring a
FSM, and now it is working properly, without the LEDs blinking.

I never knew what was not working properly of last design.

Oh and I found the LCD's datasheet (Sitronix ST7066U)
http://www.sitronix.com.tw/sitronix/product.nsf/Doc/ST7066U?OpenDocument
I honestly have not checked it completely. I am now working with other
phase.


Thank you,
m  m   _s
__________________________

On Sep 19, 5:51=A0pm, "Steve Knapp" <steveD.O.TknappA.Tprevailing-
technologyD.O.Tcom> wrote:

> I looked at the Spartan-3A Starter Kit board schematic, but it does not
> appear that the character LCD pins are shared with the LEDs.http://www.xi=
linx.com/support/documentation/boards_and_kits/ug334.pdf
>
> Do you have other outputs in the design? =A0Are those output pins defined=
 a
> LOCation in the UCF file? =A0It could be that output pins with an unassig=
ned
> pin location are landing on the LED pins.
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Steven K. Knapp
> Prevailing Technology, Inc.
> Web: =A0www.prevailing-technology.com