Coreworks CWdeb01 User manual

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
1
BasicBoard
FPGA Development and Evaluation Board
User Manual

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
2
TABLE OF CONTENTS
FEATURES....................................................................................................................................3
DESCRIPTION ..............................................................................................................................4
POWER SUPPLY..........................................................................................................................5
JUMPER SETTINGS.....................................................................................................................5
FPGA CONFIGURATION..............................................................................................................5
BASICBOARD COMPONENTS ....................................................................................................6
OSCILLATOR.............................................................................................................................6
LEDS..........................................................................................................................................6
SEVEN-SEGMENT DISPLAYS .................................................................................................6
SLIDE SWITCHES.....................................................................................................................7
PUSHBUTTONS........................................................................................................................7
RS-232 PORT............................................................................................................................8
PARALLEL PORT......................................................................................................................8
EXPANSION CONNECTORS....................................................................................................9

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
3
Block Diagram of the BasicBoard
FPGA
Xilinx Spartan
XC2S300E
Pushbuttons
Slide
switches
LEDs
7-segment
displays
Expansion
connector C
Expansion
connector D
Latches
RS-232 portParallel port
55 MHz
oscillator PROM (optional)
FEATURES
Features a Xilinx Spartan-IIE FPGA XC2S300E with a capacity of 300,000 equivalent
system gates.
Resources for basic lab work: five pushbuttons, eight LEDs, four 7-segment displays,
and eight slide switches.
Includes a 55 MHz oscillator useful as a system clock.
Parallel Port for FPGA configuration and communication purposes.
RS-232 interface for serial communication.
Includes two 40-pin expansion connectors, with 74 general-purpose I/Os and 3 FPGA
Global Clock Inputs.
Designed to mate with other Coreworks peripheral by means of the expansion
connectors.
Typical applications: basic lab teaching, specific applications using dedicated boards
plugged to the expansion connectors (audio, video, etc).

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
4
DESCRIPTION
The BasicBoard is an FPGA development and evaluation board suitable for implementation of a
wide range of application circuits. The board features a Xilinx Spartan-IIE FPGA (XC2S300E)
which has a capacity for implementing circuits with up to 300K system gates of complexity.
A simplified layout of the BasicBoard is shown in Figure 1.
The BasicBoard provides an assortment of the most frequently used interfaces for basic
laboratory work. These interfaces include eight slide switches, five pushbuttons, eight LEDs and
four 7-segment displays. There are also two independent expansion connectors with a total of
74 general purpose I/O pins connected directly to the FPGA, 3 Global Clock inputs (GCK) and 3
power pins (3.3 VDC, Ground and Voltage Unregulated).
For basic communication with a PC or other equipment, the board includes an RS-232 port and
a parallel port.
The parallel port is used to send the configuration file to the FPGA. Alternatively, the
configuration can be stored in a PROM and loaded at power-up. The PROM is an optional
component and a socket is provided for it.
The BasicBoard is designed to mate with other Coreworks boards by means of the expansion
connectors C and D.
This document describes the main blocks available in the BasicBoard. All input/output interfaces
are described, in particular, as well as the mapping between the FPGA pins and each I/O
interface. The FPGA configuration options are also described.
Xilinx
XC2S300E
DISP1DISP2DISP3DISP4
PROM
OSC
PB1 PB2 PB3 PB4 PB5
SW9
COMM CONF
Expansion
Connector D Expansion
Connector C
SW1SW2SW3SW4SW5 SW6SW7SW8
Pushbuttons
Slide
Switches
FPGA
LEDs
RS-232 PortParallel Port
Power
LED
6 V DC
Power Jack
Power
Switch
RS-232
Header
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
M2 M1 M0
Jumpers
LatchesLatches Latches Latches
Parallel Port
Header
Figure 1: Simplified layout of the BasicBoard.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
5
POWER SUPPLY
The BasicBoard uses a 6V DC power supply. The power supply should have a 2.1 mm female,
center-positive plug and be capable of delivering at least 500 mA.
The board can be switch on and off using the power switch next to the power jack. The board is
properly powered when the Power LED is turned on.
JUMPER SETTINGS
The jumpers select the FPGA configuration mode. Please see the next section (“FPGA
Configuration”) for further details.
By default the jumpers M0, M1 and M2 are not placed.
FPGA CONFIGURATION
The FPGA configuration can be loaded from a PC parallel port or from a PROM (not included in
the kit).
Typically the FPGA configuration is loaded from a PC. In this situation, the parallel port should
be used. The signals required by the JTAG programming mode pass throughout this port. To
support the JTAG mode, additional circuitry is included in the BasicBoard.
In order to prevent a communication failure between the PC and the FGPA, the power supply
must be turned on before attaching the parallel cable.
To load the configuration from a host computer, follow these steps:
1. apply power to the board,
2. attach the parallel cable (included in the kit) between the PC and the parallel port
connector of the BasicBoard,
3. set the slide switch SW9 to the CONF position,
4. remove all jumpers (M0, M1 and M2),
5. run the appropriate configuration software in the PC (e.g., IMPACT from Xilinx).
To configure the FPGA from a PROM, follow these steps:
1. place the programmed PROM into the 8-pin socket labeled PROM,
2. set the slide switch SW9 to the COMM position,
3. add all jumpers (M0, M1 and M2),
4. power-on the board.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
6
BASICBOARD COMPONENTS
The BasicBoard provides the following resources:
one 55 MHz crystal oscillator
eight leds;
four 7-segment displays;
eight slide switches;
five pushbuttons;
one RS-232 port;
one Parallel port;
two 40-pin expansion connectors.
These resources are shown in the simplified layout of the BasicBoard (Figure 1), and are
described in the following sections.
OSCILLATOR
The BasicBoard is shipped with a 55 MHz oscillator, whose output is connected to the FPGA
GCK0 input (pin 80). The oscillator module is assembled in an 8-pin socket labeled OSC. When
a different frequency is required, this oscillator can be replaced by any compatible device.
LEDS
The BasicBoard provides eight individual LEDs. All of these LEDs are active-high. Table 1
shows the FPGA pins connected to the LEDs.
LED FPGA pin
LED1 40
LED2 36
LED3 35
LED4 34
LED5 33
LED6 31
LED7 30
LED8 29
Table 1: FPGA pins for the LEDs.
SEVEN-SEGMENT DISPLAYS
The BasicBoard provides four seven-segment displays. Each seven-segment display is driven
by external D-type latches. The latches are grouped in arrays of 8 latches (one array for each
seven-segment display). Each array is addressed by an enable signal provided by the FPGA
(see Table 2). The latch is writable when the enable signal is pulled high.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
7
Display FPGA pin
DISP1 176
DISP2 178
DISP3 179
DISP4 180
Table 2: FPGA pins for the latch enable signal of each display.
Each segment in each enabled display is controlled by an FPGA output. The segment turns on,
when the FPGA output is pulled to ground (active-low signal). Table 3 shows the FPGA pins for
driving the latches of each segment.
Segment FPGA pin
A 194
B 193
C 192
D 191
E 189
F 188
G 187
Point 181
Table 3: FPGA pins for the segment drivers (latches).
SLIDE SWITCHES
The BasicBoard contains an array of eight slide switches. When closed or ON, each slide switch
pulls the FPGA pin to ground. When the slide switch is open or OFF, the pin is pulled high.
Table 4 shows the mapping between the FPGA pins and each slide switch.
Slide switch FPGA pin
SW1 49
SW2 55
SW3 56
SW4 57
SW5 58
SW6 59
SW7 60
SW8 61
Table 4: FPGA pins for the slide switches.
PUSHBUTTONS
The BasicBoard has five pushbuttons. When pressed, each pushbutton pulls the FPGA pin to
VDD. Otherwise, the pin is pulled to ground through a resistor. The connections between the
FPGA and the pushbuttons are presented in Table 5.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
8
Pushbutton FPGA pin
PB1 62
PB2 63
PB3 64
PB4 68
PB5 69
Table 5: FPGA pins for the pushbuttons.
RS-232 PORT
The BasicBoard has a 9-pin RS-232 port that provides an interface to transmit and receive
serial data streams (TXD and RXD, respectively), as well as the flow control signals (RTS, CTS
and DSR). The pin functions on the BasicBoard RS-232 port are identical to those found on a
PC serial port. When the BasicBoard and the PC are to communicate, a DTE-to-DCE cable
(straight-thru cable) should be used. Table 6 shows the mapping between the FPGA pins and
the RS-232 interface. The RS-232 pinout is shown in Figure 2.
RS-232 signal RS-232 pin FPGA pin Direction RS-232 Function
RXD 3 202 I Receive Data
TXD 2 201 O Transmit Data
DSR 6 200 O Data Set Ready
RTS 7 198 I Request to Send
CTS 8 199 O Clear to Send
Table 6: FPGA pins for the RS-232 port.
9 8 7 6
54321
Figure 2: RS-232 connector (front view).
PARALLEL PORT
The BasicBoard contains a parallel port connector (25-pins female connector). This interface
establishes a communication channel between a computer and the FPGA.
The BasicBoard supports both SPP (Simple Parallel Port) and EPP (Enhanced Parallel Port –
IEEE 1284) protocols. The EPP protocol is highly recommended because provides a
bidirectional data channel and a much higher data transfer rate (see Table 7).
NOTE: The parallel port must be configured to the selected protocol (SPP or EPP). In a PC, the
parallel port protocol is changed in the BIOS setup. To enter the BIOS setup, the appropriate
key (F2, DEL, etc.) must be pressed while the system is starting up.
Port Mode Maximum Transfer Rate
(MB/s) Direction
SPP 0.15
Unidirectional (PC ⇒BasicBoard)
EPP 2 Bidirectional
Table 7: Comparison between SPP and EPP modes.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
9
The FPGA configuration can be loaded using the parallel port interface. The slide switch SW9
toggles between the configuration mode (CONF position) and the normal communication
(COMM position).
Table 8 shows the mapping between the FPGA pins and the parallel port interface. The parallel
port pinout is shown in Figure 3.
Signal name Connector
pin FPGA pin Direction EPP Function
PWE 1 206 O Write Enable
PD0 2 15 I/O Address/Data 1
PD1 3 11 I/O Address/Data 2
PD2 4 10 I/O Address/Data 3
PD3 5 9 I/O Address/Data 4
PD4 6 8 I/O Address/Data 5
PD5 7 7 I/O Address/Data 6
PD6 8 6 I/O Address/Data 7
PD7 9 5 I/O Address/Data 8
PINT 10 4 I Interrupt
PWT 11 3 I Wait
−12 −−not connected
−13 −−not connected
PDS 14 205 O Data Strobe
−15 −−not connected
PRS 16 203 O Reset
PAS 17 204 O Address Strobe
−18-25 −−Ground
Table 8: FPGA pins for the parallel port (EPP Mode).
12 11 1013 9 8 7
232425 22 21 20
6 5 4 3
18 17 1619
2 1
17 1415
Figure 3: Parallel port (front view).
EXPANSION CONNECTORS
Expansion boards with specialized circuitry can be connected to the BasicBoard through
expansion connectors C and D. The connector pins have a pitch (spacing) of 100 mils (or 2.54
mm). The ground (GND) is available on pin 1 of connector C (C01), the VDD (3.3 V) is routed to
pin C03, and pin C02 provides a Voltage Unregulated (VU) signal (direct connection to the
voltage provided by the 6 V DC power jack). All other pins in connectors C and D are routed
directly to the FPGA.
Among those pins, three of them are connected to dedicated FPGA clock pins. These inputs are
available in pins C05, C19 and C29 (connector C).
Table 9 shows the mapping between the FPGA pins and the expansion connectors C and D.

CWdeb01 - BasicBoard
FPGA DEVELOPMENT AND EVALUATION BOARD
PRELIMINARY USER MANUAL, April 13, 2004
Copyright 2004, Coreworks, Lda
coreworks, lda
http://www.coreworks.pt
10
Most of the pins available in the expansion connectors can be used as general-purpose pins
(see Table 9). However, some pins can be used to access specific resources in the FPGA
(Digital Looked Loops (DLLs), Threshold Reference Voltages, etc.). For further information on
the Spartan XC2S300E pinout, please see the datasheets available at the Xilinx website
(www.xilinx.com).