FPGA : How to implement Picoblaze running on Spartan-III board
Fri, 08/15/2014 - 06:54 — ataya_p
Written
by
: Ataya P
Date
: 31 March 2007
Introduction
Hi !! everyone who has interest in Embedded Systems Technology.I 'm just
a newbie
around here but I really want to share my experiences that
I just found out by my DIY testing. Please don't
blame me if you burning something wrong with my suggestion
here. Ha ha *\(^_^)/*
Before
cooking
Ok.First of all. We need some ingredients
for making this project work. Here is a list
- Hardware
PC : my PC is desknote VIA cpu 500
MHz RAM 256MByte
Window 2000
--little bit slow.( I prefer to use Linux but
I
can't run ISE(with JTAG support) on that OS. That's
pity
(ToT) )
FPGA
board : I use FPGA
discovery-III XC3S200 from
Ailogic
technology Thailand with has
Spartan-III
200,000 gates and JTAG cable for
downloading BIT
file.
- Software
ISE version 6 up for building VHDL Picoblaze code.
pBlazeIDE for making assembly code runing
on Picoblaze.
Picoblaze sourcecode for usingNow<Spartan-III (download
freely
from Xilinx
website)
Making
time
After
installed all softwares that we
need. Just open ISE and create a new project name Picoblaze (you
can use any name that you want) then copy picoblaze VHDL
source
code that you download from Xilinx website to the project directory
then add all VHDL files to ISE project source. ISE will show
file
association and you will know that we still need prog_rom component
Ok.What is prog_rom component ? It is a ROM code for
executed picoblaze mpu. This component can generated by 2 ways (As I
know) First, using Xilinx assembler that attach with picoblaze VHDL
source code by writing PSM code
(assembly code for picoblaze) and
assembly it. the Other way is using pBlazeIDE
(the easy way for me) to writting PSM file
and assembly it. Anyway the format of PSM in pBlazeIDE and Xilinx
assembler is not the same format. You should be careful about this.
So,Just making PSM source code with pBlazeIDE and
generated .VHDL file that contain the ROM code for running on
picoblaze. Afterthat just
copy VHDL file to the ISE project directory and add it to the project
source directory.
Now just fix the source of embedded_kcpsm3.vhd to point at your ROM file by changing of
...
component
prog_rom
Port (
address : in std_logic_vector(9 downto
0);
instruction : out std_logic_vector(17 downto
0);
clk : in std_logic);
end component;
.....
program: prog_rom
port
map(
address => address,
instruction => instruction,
clk => clk);
to be like this ...
component ROM
Port (
address : in std_logic_vector(9 downto
0);
instruction : out std_logic_vector(17 downto
0);
clk : in std_logic);
end component;
......
program: ROM
port
map(
address => address,
instruction => instruction,
clk => clk);
That is . "ROM" is the name
of your entity that is in the ROM code you just
generated from
pBlazeIDE. So, If you use the other name. Please change to fit with it
too.
Now we have to change somethings in the picoblaze
VHDL code because of my FPGA board's pins aren't designed for I/O with
picoblaze. The interrupt pin and reset pin are inverted.That why I have
to assign NOT gate by
myself.
processor: kcpsm3
port
map(
address => address,
instruction => instruction,
port_id => port_id,
write_strobe => write_strobe,
out_port => out_port,
read_strobe => read_strobe,
in_port => in_port,
interrupt => not interrupt, - -my board is coverted
interrupt_ack => interrupt_ack,
reset => not
reset, -
-my board is coverted
clk => clk);
Alright now we ready to rumble !!! after assign package pins .
Try to synthesis and generate programing file. if everything is
alright. you will be able to burn BIT file in to the FPGA board without
problem. Is that easy ? (>.<)***
Pic 1 : Spartan-III
FPGA board
Pic
2 : ISE 6.3.03i
Pic
3 :
pBlazeIDE 3.7.4
Pic
4
: Download Bit file with Impact
File
and Source code :
>>
test.psm <<
: psm file for push switch and led is on
>>
embedded_kcpsm3.ucf <<:
pin assignment file of ISE
*** due to software license . the others
files you should download from the original website by
yourself.Useful
links :
Picoblaze
project
http://www.xilinx.com/ for picoblaze sourcecode
http://www.mediatronix.com/pBlazeIDE.htm
for download pBlazeIDE
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