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20 www.xilinx.com Spartan-3E FPGA Starter Kit Board User Guide
UG230 (v1.2) January 20, 2011
Chapter 2: Switches, Buttons, and Knob
R
Operation
Each LED has one side connected to ground and the other side connected to a pin on the
Spartan-3E device via a 390Ω current limiting resistor. To light an individual LED, drive the
associated FPGA control signal High.
UCF Location Constraints
Figure 2-11 provides the UCF constraints for the four push-button switches, including the
I/O pin assignment, the I/O standard used, the output slew rate, and the output drive
current.
Related Resources
• Rotary Encoder Interface for Spartan-3E Starter Kit (Reference Design)
http://www.xilinx.com/s3estarter
Figure 2-11: UCF Constraints for Eight Discrete LEDs
NET "LED<7>" LOC = "F9" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<6>" LOC = "E9" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<5>" LOC = "D11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<4>" LOC = "C11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<3>" LOC = "F11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<2>" LOC = "E11" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<1>" LOC = "E12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
NET "LED<0>" LOC = "F12" | IOSTANDARD = LVTTL | SLEW = SLOW | DRIVE = 8 ;
- Spartan-3E FPGA 1
- Starter Kit Board 1
- User Guide 1
- Revision History 2
- Table of Contents 3
- Chapter 6: VGA Display Port 5
- Chapter 12: SPI Serial Flash 6
- Chapter 13: DDR SDRAM 6
- Appendix A: Schematics 7
- About This Guide 9
- Additional Resources 10
- Introduction and Overview 11
- Key Components and Features 12
- Design Trade-Offs 13
- Switches, Buttons, and Knob 15
- Push-Button Switches 16
- Rotary Push-Button Switch 17
- Rotary Shaft Encoder 18
- Discrete LEDs 19
- Clock Sources 21
- ±2500 Hz or ±50 ppm 22
- Chapter 3: Clock Sources 24
- FPGA Configuration Options 25
- UG230_c4_01_022006 26
- Configuration Mode Jumpers 27
- PROG Push Button 28
- DONE Pin LED 28
- Connecting the USB Cable 29
- UG230_c4_06_022406 30
- UG230_c4_07_022406 30
- UG230_c4_08_022406 31
- UG230_c4_09_022406 31
- UG230_c4_10_022406 32
- UG230_c4_11_022706 33
- UG230_c4_12_022706 33
- Generating the PROM File 34
- UG230_c4_13_022706 34
- UG230_c4_14_022706 34
- UG230_c4_15_022706 35
- UG230_c4_16_022706 35
- UG230_c4_17_022706 36
- UG230_c4_18_022706 36
- UG230_c4_19_022706 37
- UG230_c4_20_022706 37
- UG230_c4_21_022706 38
- UG230_c4_22_022706 38
- UG230_c4_23_022706 39
- UG230_c4_24_022806 39
- UG230_c4_25_022806 40
- UG230_c4_26_022806 40
- UG230_c4_27_022806 41
- Character LCD Screen 43
- Voltage Compatibility 44
- LCD Controller 45
- UG230_c5_02_030306 47
- Command Set 48
- Disabled 49
- Clear Display 49
- Return Cursor Home 49
- Entry Mode Set 49
- Display On/Off 50
- Cursor and Display Shift 50
- Function Set 51
- Set CG RAM Address 51
- Set DD RAM Address 51
- Read Busy Flag and Address 51
- Operation 52
- Power-On Initialization 53
- Display Configuration 53
- VGA Display Port 55
- UG230_c6_02_021706 57
- VGA Signal Timing 58
- Chapter 6: VGA Display Port 60
- RS-232 Serial Ports 61
- PS/2 Mouse/Keyboard Port 63
- Keyboard 64
- UG230_c8_03_021806 65
- UG230_c8_04_021806 66
- UG230_c8_05_021806 66
- Voltage Supply 67
- Chapter 9 69
- Interface Signals 70
- SPI Communication Details 71
- Communication Protocol 71
- DAC Outputs A and B 72
- DAC Outputs C and D 72
- Analog Capture Circuit 75
- UG230_c10_02_022306 76
- Programmable Pre-Amplifier 77
- SPI Control Interface 78
- Interface 79
- Connecting Analog Inputs 81
- Chapter 11 83
- StrataFlash Connections 84
- Shared Connections 87
- SPI Serial Flash 91
- Configuring from SPI Flash 92
- UG230_c15_04_030206 93
- UG230_c15_05_030206 94
- UG230_c15_06_030206 94
- UG230_c15_07_030206 95
- UG230_c15_08_030206 95
- UG230_c15_09_030206 96
- UG230_c15_10_030206 96
- UG230_c15_11_030206 96
- UG230_c15_12_030206 97
- UG230_c15_13_030206 97
- Downloading the SPI Flash 98
- with Flying Leads 99
- Additional Design Details 100
- °. The 16-pin SOIC 101
- (Do not connect) 102
- UG230_c15_18_030606 102
- Related Resources 103
- Chapter 12: SPI Serial Flash 104
- DDR SDRAM 105
- DDR SDRAM Connections 106
- UCF Location Constraints 108
- Chapter 13: DDR SDRAM 110
- 25 MHz Crystal 111
- UG230_c14_01_022706 111
- Ethernet PHY Connections 112
- UG230_c14_03_022706 113
- Expansion Connectors 115
- Hirose 100-pin Expansion 116
- Connector (J3) 116
- Compatible Board 118
- Mating Receptacle Connectors 118
- Differential I/O 118
- Using Differential Inputs 120
- Using Differential Outputs 121
- UG230_c12_05_022406 121
- UG230_c12_06_022406 121
- Six-Pin Accessory Headers 123
- XC2C64A CoolRunner-II CPLD 127
- UG230_c16_01_030906 128
- UG230_c17_01_030906 131
- Schematics 133
- UG230_Aa_01_021806 135
- UG230_Aa_02_021806 137
- Appendix A: Schematics 138
- UG230_Aa_03_021806 139
- Voltage Regulators 140
- UG230_Aa_04_021806 141
- Flash, JTAG Connections 142
- UG230_Aa_05_021806 143
- UG230_Aa_06_021806 145
- FPGA I/O Banks 2 and 3 146
- UG230_Aa_07_021806 147
- Power Supply Decoupling 148
- UG230_Aa_08_021806 149
- UG230_Aa_09_021806 151
- UG230_Aa_10_021806 153
- UG230_Aa_11_021806 155
- UG230_Aa_12_021806 157
- Termination 158
- UG230_Aa_13_021806 159
- Appendix B 161
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