====== UCF location constraints (Spartan-3AN Starter Kit board) ======

[ __[[vlsi:workbook:fpga:spartan3an|Back]]__ ]

== Contents ==

   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#introduction|Introduction]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#reference_documentation|Reference documentation]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#slide_switches|Slide switches]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#push-button_switches|Push-button switches]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#discrete_leds|Discrete LEDs]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#clock_sources|Clock sources]]
   * [[vlsi:workbook:fpga:xilinx:spartan3an:ucf#six-pin_accessory_headers|Six-pin accessory headers]]
   * ... (VGA, LCD, audio jack etc.)



====== Introduction ======

Quick cut-and-paste code snippets.


====== Reference documentation ======

//Spartan-3A/3AN FPGA Starter Kit Board User Guide// (''ug334.pdf'') \\
[[http://www.xilinx.com/support/documentation/boards_and_kits/ug334.pdf]]


//Constraints Guide// (''cgd.pdf'') \\
[[http://www.xilinx.com/itp/xilinx10/books/docs/cgd/cgd.pdf]]

====== Slide switches ======

<code>
NET "SW0"   LOC = "V8"  |  IOSTANDARD = LVCMOS33 ;
NET "SW1"   LOC = "U10" |  IOSTANDARD = LVCMOS33 ;
NET "SW2"   LOC = "U8"  |  IOSTANDARD = LVCMOS33 ;
NET "SW3"   LOC = "T9"  |  IOSTANDARD = LVCMOS33 ;
</code>




====== Push-button switches ======

__**Push-button switches**__

<code>
NET "EAST"    LOC = "T16"  | IOSTANDARD = LVCMOS33  |  PULLDOWN ;
NET "NORTH"   LOC = "T14"  | IOSTANDARD = LVCMOS33  |  PULLDOWN ;
NET "SOUTH"   LOC = "T15"  | IOSTANDARD = LVCMOS33  |  PULLDOWN ;
NET "WEST"    LOC = "U15"  | IOSTANDARD = LVCMOS33  |  PULLDOWN ;
</code>


\\
__**Rotary push-button switch**__

<code>
NET "A"       LOC = "T13"  |  IOSTANDARD = LVCMOS33  | PULLUP   ;
NET "B"       LOC = "R14"  |  IOSTANDARD = LVCMOS33  | PULLUP   ;
NET "CENTER"  LOC = "R13"  |  IOSTANDARD = LVCMOS33  | PULLDOWN ;
</code>


====== Discrete LEDs ======

<code>
NET "LED0"   LOC = "R20"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED1"   LOC = "T19"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED2"   LOC = "U20"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED3"   LOC = "U19"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED4"   LOC = "V19"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED5"   LOC = "V20"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED6"   LOC = "Y22"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ; 
NET "LED7"   LOC = "W21"  |  IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ;
</code>




====== Clock sources ======

__**On-board 50 MHz crystal oscillator**__

<code>
NET "CLK"   LOC = "E12"  |  IOSTANDARD = LVCMOS33 ;
</code>


\\
__**Auxiliary clock oscillator socket (empty)**__

<code>
NET "CLK"   LOC = "V12"  |  IOSTANDARD = LVCMOS33 ;
</code>

\\
__**SMA connector**__

<code>
NET "CLK"   LOC = "U12"  |  IOSTANDARD = LVCMOS33 ;
</code>

====== Six-pin accessory headers ======


__**Thru-hole pads (J19 header test points)**__

<code>
NET "PAD1"   LOC = "Y18"  | IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ;
NET "PAD2"   LOC = "W18"  | IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ;
NET "PAD3"   LOC = "V17"  | IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ;
NET "PAD4"   LOC = "W17"  | IOSTANDARD = LVCMOS33  | SLEW = SLOW  | DRIVE = 8 ;
</code>




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Last update: [[pacher@NOSPAMto.infn.it|Luca Pacher]] - Nov 19, 2014