readme

flashing led example code

-- Copyright(C) 2006 by Xilinx, Inc. All rights reserved. 
-- The files included in this design directory contain proprietary, confidential information of 
-- Xilinx, Inc., are distributed under license from Xilinx, Inc., and may be used, copied 
-- and/or disclosed only pursuant to the terms of a valid license agreement with Xilinx, Inc. 
-- This copyright notice must be retained as part of this text at all times. 


FLASH is a simple schematic project illistrating hierarchy

DESIGN TYPE: ISE (chip 4VLX15 SF363 -12)
 
CONTROLS (Inputs):
       CLKIN      - external clock input,  
OUTPUTS:  
       LED [6..0] - 7-segment display for the decade counter,
       Q   [7..0] - LEDs for Johnson counter outputs.  

DESCRIPTION: This simple project contains two counters: counter and 8-bit Johnson counter.  Outputs the counters are connected to the 7-segment          display (counter) and 8 LEDs (Johnson).  Clock inputs of the counters are connected to the external signal CLKIN (divided by 2 for the counter). 

TIMINGS: Requires the following libraries for simulation: 
    unisim 
    simprim 
	  
Behavioural and RTL Simulation done using VHDL Testbench (flash_tb.vhd). 
  

NOTE: If you are trying to run this example in a read-only location, the design hierachy will not display properly.  Please copy the example project to a new location by using either Project Save As... from the File menu pulldown in ISE or some other method of your choice.  Copy the example to a location where you have write permissions and the hiearchy will display properly. 
  
For support information and contacts please see: 
  
	http://www.xilinx.com/support
or 
	http://www.xilinx.com/support/services/contact_info.htm