Open3S250E

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Open3S250E Standard
XILINX Development Board
Open3S250E-Standard l.jpg

FPGA development board designed for XILINX Spartan-3E series, features the XC3S250E onboard, and integrates various standard interfaces, pretty easy for peripheral expansions.
Open3S250E Package A
Open3S250E-Package-A l.jpg
Open3S250E Package B
Open3S250E-Package-B l.jpg
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Overview

This user manual contains schematic and demo of Waveshare Open3S250E[1] development board. It helps you to quick start your development.

Hardware design

This chapter mainly about the basic idea of the hardware design of Core3S250E Xilinx core board. Go with you to witness how a XC3S250E chip becomes Core3S250E board.
There are voltage regulator AMS1117, serial FLASH memory XCF02S, crystal oscillator, JTAG interface, LEDs, buttons, etc., beside main FPGA. See product description What's On Board. Then, how and why do the devices connect together? What are their functions?

Power Supply Circuit

Power Supply Circuit is the basic circuit for Core3S250E's normal operation. You can find voltage supplies details from the datasheet. Noting that XC3S250E requires 2.5V for Internal core supply voltage (VCCINT), requires 2.5V for Auxiliary supply voltage (VCCAUX). Then IO voltage VCCO_0/1/2/3 can be connected to 3.3V, 2.5V, 1.8, 1.5V, or 1.2V to supply each area with different voltage standards. So for normal operation, the power supply of the board is designed for converting input voltage 5V to multiple voltages 3.2V, 2.5V, 1.2V. Meanwhile, a PWR LED is connected to 3.3V output for the needs of checking power operation status. The schematic of the circuit:

Power Supply Circuit

Pin Name Description
5V 5V supply voltage, External Input
VCC3.3 3.3V voltage, converted from AMS1117-3.3, is generally used to supply the voltage of clock, configure circuit, special features pin high, etc.
VCC2.5 2.5V voltage, converted from AMS1117-2.2, is generally used to supply the voltage of VCCAUT, VCCO_X , etc.
VCC1.2 1.2V voltage, converted from AMS1117-1.2, is generally used to supply the voltage of VCCINT, VCCO_X , etc.

Clock Circuit

The best solution of FPGA clock circuit is: A main clock, which is driven by dedicated global clock input(GCLK), controls each timing device of the design. Try to use global clock at any design. The FPGA has dedicated global clock pin, which is connected to each register of the device. The shortest time span of GCLK can supply is used for delay. We use a global clock interface CLK in our design, because it is single clock interface, we consider the use of active crystal clock as an external clock source. A 50MHz crystal oscillator on board is used for supply accurate clock. The schematic of the circuit:

Clock Circuit

Pin Name Description
CLK Clock input

Reset Circuit

The Reset Circuit contains RST Reset Circuit and nCONFIG Reconfigure Circuit. RST reset Circuit is a RC reset Circuit with RESET button switch, which is pressed to generate a Reset-signal, active-low. While nCONFIG Reset Circuit is triggered by nCONFIG key. FPGA will be reconfigured without reboot when the nCONFIG key is pressed. The schematic of the circuit:

reset Circuit

Pin Name Description
RESET Active-low Reset
PROG_B Active-low Reset, FPGA will be reconfigured, as soon as PROG_B pin restores to high level

Configuration/Programming Interface

Configuration is also known as loading and download. It is a process of FPGA programming. FPGA reconfigured at each reboot is a feature of SRAM-based FPGA. Within the FPGA, many programmable multiplexers, logic, interconnect nodes and RAM initialization, etc. are controlled by configuration data, which is stored in FPGA RAM.
The configured data of FPGA can be downloaded to target device with 3 methods, FPGA Active, FPGA Passive and JTAG, according to the role played in Configure Circuit. JTAG is an industry-standard interface. Usually All FPGA can be configured via JTAG commands. Meanwhile, JTAG has more priority than other configuration method. Of course this board provides JTAG interface. The schematic of the circuit:
User can use dedicated programmer Platform Cable USB to debug and program. File to be programmed to XCF02S PROMs should be converted to .msc file by Xilinx ISE.

JTAG Interface

Pin Name Description
TDI Test Data In
TDO Test Data Out
TMS Test Mode Select. This is the JTAG mode signal that establishes appropriate TAP state transitions for target ISP devices.
TCK Test Clock. This is the clock signal for JTAG operations, and should be connected to the TCK pin on all target ISP devices that share the same data stream.

Configuration Circuit

A PROM XCF02SA, Platform Flash series of in-system programmable configuration PROM, is connected to the FPGA for keeping the data without power supplied. XCF02S is one of advanced Configuration PROM, 4Mbit density. It supports high capacity single configuration of FPGA. It also support in-system programming by JTAG interface. The schematic of the circuit:

ConfigureCircuit

LED Circuit

4 LEDs onboard. each LED is driven via one of the FPGA pins. When a low level inputs to LED pin, the corresponding LED turns on. The schematic of the circuit:

Xilinx-LED-Circuit.png

Extention Board interface

Series of Open boards designed by Waveshare are based on Core-Extension-Separated idea. On the one hand, users can easily design extension circuit according to their needs, On the other hand, the interfaces of core board and extension board are fully considered about the compatible to other FPGA boards, make update easier.

Basic operation

Power Up And Download

Power up Core3S250E with 5V supply then the PWR_LED will light up in usual. The onboard JTAG interface is used for programming with dedicated programmer Platform Cable USB, as shown in the following figure:

Connect Platform Cable USB

Example quick start

All the following demos require power supplied. Verilog and VHDL are used in the following demos, please download the corresponding one.
An open3S250E development board is used for demonstration, Other Xilinx boards are similar to it. If there are differences on any example, they will be special explained.

Test 1, Light up LEDs

Language

Verilog

VHDL

Sample Program Name

 LED

Steps
  1. Download the program.

Phenomena
  • LEDs blink.

Test 2, JOYSTICK Test

Language

Verilog

VHDL

Sample Program Name

 JOYSTICK

Steps
  1. Plug in the jumper on JOYSTICK JMP.
  2. Download the program.

Phenomena
  • Control the joystick, and the LED status will change accordingly.

Test 3, 8 Push Buttons Test

Language

Verilog

VHDL

Sample Program Name

 8 Push Buttons

Steps
  1. Connect 8 Push Buttons to 8I/Os_2 interface.
  2. Download the program.

Phenomena
  • Press the buttons on 8 Push Buttons board, and the LED status will change accordingly.

Test 4, 8 SEG LED Board Test

Language

Verilog

VHDL

Sample Program Name

 8 SEG LED Board

Steps
  1. Connect 8 SEG LED Board to 16I/Os_2 interface.
  2. Download the program.

Phenomena
  • 8 SEG LED Board shows.

Test 5, 4x4 Keypad Test

Language

Verilog

VHDL

Sample Program Name

4x4 Keypad

Steps

  1. Connect 4x4 Keypad to 8I/Os_2 interface.
  2. Connect 8 SEG LED Board to 16I/Os_2 interface.
  3. Download the program.

Phenomena

  • Press the key on 4x4 Keypad, and 8 SEG LED Board will show accordingly.

Test 6, DS18B20 Temperature Sensor Test

Language

Verilog

Sample Program Name DS18B20
Steps
  1. Connect DS18B20 to 1-WIRE port.
  2. Connect 8 SEG LED Board to 16I/Os_1 interface
  3. Download the program
Phenomena
  • 8 SEG LED Board will show the temperature accordingly.

Test 7, Buzzer Test

Language

Verilog

VHDL

Sample Program Name

PWM / Buzzer

Steps

  1. Plug in the jumper on Buzzer JMP.
  2. Download the program.

Phenomena

  • Buzzer will buzz.

Test 8, PS/2 Keyboard Test

Language

Verilog

VHDL

Sample Program Name

PS2

Steps

  1. Connect VGA PS2 Board to 16I/Os_2, then connect a PS/2 keyboard to the PS/2 port of the module board.
  2. Connect LCD1602 to LCD1602 interface. Please note that the No. 1 pin of LCD should be plugged in the hole marked with "1".
  3. Download the program

Phenomena

  • LCD1602 will show the input by PS/2 keyboard.

Test 9, VGA Test

Language

Verilog

VHDL

Sample Program Name VGA
Steps
  1. Connect VGA PS2 Board to 16I/Os_2 interface, then connect a VGA disply to the VGA port of the module board.
  2. Download the program.
Phenomena
  • VGA display will show.

Test 10, LCD1602 Test

Language

Verilog

VHDL

Sample Program Name LCD1602
Steps
  1. Connect LCD1602 to LCD1602 interface. Please note that the No. 1 pin of LCD should be plugged in the hole marked with "1".
  2. Download the program.
Phenomena
  • LCD1602 will show.

Test 11, LCD12864 Test

Language

Verilog

VHDL

Sample Program Name

LCD12864
Steps
  1. Connect LCD12864 to LCD interface.
  2. Download the program.
Phenomena
  • LCD12864 will show.

Test 12, USB Communication Test

Language

VHDL

Sample Program Name

USB
Steps Connect the pin side of CY7C68013A USB Board to 32I/Os_1 interface, and connect the USB side to PC's USB port.
Download the program
Phenomena Run USB_LED.exe on the PC to control onboard LED.

Test 13, UART Serial Test

Language

Verilog

VHDL

Sample Program Name

UART
Steps
  1. Connect the pin side of RS232 Board to 8I/Os_2, and the other side to PC's serial port.
  2. Connect 8 SEG LED Board to 16I/Os_2 (Only connect in VHDL Test).
  3. Download the program.
Phenomena
  • Run PuTTY to communicate with serial. Sending any strings will cause same strings receiving from PuTTY.
  • 8 SEG LED Board will show the number character received from PuTTY.

Test 14, I2C EEPROM Test

Language

Verilog

VHDL

Sample Program Name

AT24CXX
Steps
  1. Connect AT24CXX EEPROM Board to 8I/Os_1 interface.
  2. Connect 8 SEG LED Board to 16I/Os_2 interface.
Phenomena
  • Two digital tubes on the 8 SEG LED Board show. One of them shows the data writen to AT24CXX from pin1, pin3, pin5, pin7 of SDRAM_L header. And the other one shows the data read from AT24CXX. Please connect a jumper between pin1 and pin2 of SDRAM_R then remove it, and connect pin3 and pin4 of SDRAM_R with a jumper. Data will be written in AT24CXX, and read from it again, then shown on the 8 SEG LED Board.

Test 15, AT45DBTest

Language Verilog

Sample Program Name

AT45DBXX_SPI
Steps
  1. Connect AT45DBXX DataFlash Board to 8I/Os_2 interface.
  2. Download the program.
Phenomena
  • LEDs will show the data written to AT45DBXX DataFlash Board as binary, and then show the data read from the board as binary.

Test 16, PCF8563 Clock Test

Language

Verilog

Sample Program Name

PCF8563
Steps
  1. Connect PCF8563 RTC Board to 8I/Os_2 interface.
  2. Connect 8 SEG LED Board to 16I/Os_2 interface.
  3. Download the program.
Phenomena
  • 8 SEG LED board will show the time information.

Test 17, PCF8591 A/D Test

Language

Verilog

Sample Program Name

PCF8591
Steps
  1. Connect PCF8591 AD DA Board to 8I/Os_2 interface.
  2. Connect 8 SEG LED Board to 16I/Os_2 interface.
  3. Download the program.
Phenomena
  • The two digital tubes on the right show AOUT pin voltage from PCF8591. If any voltage is detected from AIN0, the two digital tubes on the left show a hex number according to the voltage AIN0 is supplied with. If no voltage is detected from AIN0, the two digital tubes on the left show a hex number according to the voltage from AOUT.

References

  1. ↑ Open3S250E development board

Resources




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