Filter
Top Products
FPSLIC STK594 User Guide 4-1
Rev. 2819A–FPSLI–07/02
Section 4
Using System Designer
This tutorial will guide you through the required steps for designing and programming
AT94K series devices using System Designer.
4.1 Preparing the
Example Files
Before starting the tutorial, a few preparations need to be performed:
1. Create a STK594 directory under C:\SystemDesigner\Designs\.
2. Download STK594.ZIP from the FPSLIC software page of the Atmel web site
and copy STK594.ZIP to C:\SystemDesigner\Designs\STK594.
3. Extract the contents of the STK594.ZIP file to
C:\SystemDesigner\Designs\STK594.The contents of the zip file are
shown in Table 4-1.
4.2 Description The design in this tutorial is composed of a simple AVR microcontroller program and a
loadable counter implemented in the FPGA. When the counter reaches the terminal
value, an interrupt to the microcontroller will be generated using the counter’s carry-out
(RCO) signal. The interrupt is active Low and must be held for three clock cycles prior to
its acknowledgement by the microcontroller. During the Interrupt Service Routine (ISR)
the microcontroller increments the count of interrupt occurrences and places the incre-
mented data on PORTD and the AVR-FPGA Data Bus, triggering the counter’sLOAD
signal. Once the counter has been loaded, counting will commence and the process will
be repeated. Figure 4-1 shows a simplified block diagram of the tutorial design.
Table 4-1.
STK594.ZIP
File Description
AT94KDEF.INC Atmel AVR Assembler AT94K FPSLIC Include File
COUNTER.PIN FPGA Pin Lock File
COUNTER.V Top Level FPGA Verilog
®
Counter Source File
COUNTER.VHD Top Level FPGA VHDL
®
Counter Source File
STK594.ASM Atmel AVR Assembler Source File