XAPP078 April, 1997 (Version 1.0) Summary demo board described th
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XC9536 Demo Board
XAPP078 April, 1997 (Version 1.0) Summary
demo board described this application note tool demonstrating In-System Programming (ISP) capabilities XC9500 CPLD family. Xilinx Family XC9500
Introduction
Using EZTag, download software from Xilinx, easily program XC9500 device while attached board. EZTag allows program, verify, erase, functionally test XC9500 devices. schematic demonstration board, using XC9536 device, shown Figure
these locations provide connection points plug-on jumpers wire-wrapping. proto-typing area customer version holes columns rows) attaching additional circuitry. holes .038" diameter .10" centers. pair these holes connected along left side prototyping area. Figure shows ABEL code used describe Johnson Shift Counter; created implemented with Xilinx XABELCPLD software. this reference design as-is, modify design required. Figure shows same design done VHDL, using Xilinx Foundation software.
Design Description
There versions this demo board described below. Both versions surface-mount timer, with resistor capacitor values operation. This oscillator clocks simple test design Johnson counter) implemented XC9536; this counter drives LEDs used verify operation. versions demo board are: version XC9536 Demo Board comes plastic case which holds Printed Circuit Board (PCB) battery, regulator, filter capacitor, on-off switch. Customer version Customer XC9536 Demo Board same version except addition prototyping area. Also, case, battery, regulator, filter capacitor, on-off switch installed customer version.
Parts List
version Demo Board comes complete with parts installed. Customer version does include power supply components which purchased from Digi-Key shown Table Table Digi-Key Parts List Qty. Description DPDT Switch, right angle dropout reg. 22uf, 16V, Tantalum cap. Digi-Key Part Ref. EG1909 LM2940CT-5.0 P2040
Both PCBs come with 44-pin VQFP XC9536 device with bypass capacitors, LEDs with current limiting resistors, header attaching JTAG Cable. Both versions Demo Board allow attachment external regulated power supply pads regulator installed location with 22uF larger) filter capacitor external voltage applied location This where battery attached version. will accept either DPDT switch permanent jumper location SW1. switch used connect disconnect external voltage from regulator. pins XC9536 device connected throughhole pads PCB, numbered Header rows of.025" square posts .10" centers) installed
Digi-Key Corporation located Brooks Ave. South, Thief River Falls, 56701-0677, Tel: 800-344-4539, Fax: 218-681-3380, (http://www.digikey.com). customer version designed into SERPAC plastic case, Model H-65 This case purchased from SERPAC, Commercial Ave., Covina, 91723, Tel: 818-331-0517, Fax: 818-331-8584 (http:// www.serpac.com).
XAPP078 April, 1997 (Version 1.0)
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XC9536 Demo Board
60mA BATTERY
0.1uF
LM2940
22uF
0.1uF
GTS2 GTS1 GCK1 GCK2
XC9536
GCK3
TRIG
DISCH THRES
.047uF
RESET CONT
TLC555
Figure Demo Board Schematic
1-56
XAPP078 April, 1997 (Version 1.0)
module jcounter Title 'Johnson Shift Counter'
Declarations
istype 'reg'; istype 'reg'; istype 'reg'; istype 'reg'; istype 'reg'; istype 'reg'; istype 'reg'; istype 'reg'; [q7.q0];
GCK1 XC9536 CPLD Declaration
Equations //Johnson Shift Counter description q.clk clk; !q7;
jcounter
Figure ABEL Code Johnson Counter
XAPP078 April, 1997 (Version 1.0)
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XC9536 Demo Board
library IEEE; IEEE.std_logic_1164.all; library metamor; metamor.attributes.all;
entity jcounter port clk:in STD_LOGIC; Dout:buffer STD_LOGIC_VECTOR downto
attributes assign locations Foundation VHDL attribute pinnum Dout:signal "p13,14,16,18,19,20,21,22"; jcounter;
architecture jcounter_arch jcounter begin
process (CLK) begin CLK'event CLK='1' then-CLK rising edge Dout(7 downto Dout(6 downto 0);-Shift register Dout(0) Dout(7);-Last inverted back into first process;
jcounter_arch;
Figure VHDL Code Johnson Counter
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XAPP078 April, 1997 (Version 1.0)
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