Switches - XESS XStend Manual

Listing 2: Connections between the XStend LEDs and the XS95.
# LEFT LED DIGIT SEGMENT CONNECTIONS (ACTIVE-LOW)
NET LS_0
NET LS_1
NET LS_2
NET LS_3
NET LS_4
NET LS_5
NET LS_6
NET LDP_
#
# RIGHT LED DIGIT SEGMENT CONNECTIONS (ACTIVE-LOW)
NET RS_0
NET RS_1
NET RS_2
NET RS_3
NET RS_4
NET RS_5
NET RS_6
NET RDP_
#
# INDIVIDUAL LED CONNECTIONS (ACTIVE-LOW)
NET D_1
NET D_2
NET D_3
NET D_4
NET D_5
NET D_6
NET D_7
NET D_8

2.3 Switches

The XStend has a bank of eight DIP switches and two pushbuttons (labelled SPARE and
RESET) that are accessible from the XS Boards.
PROGRAM which is used to initiate the programming of the XS40 Board. It is not intended to
be a general-purpose input.)
When closed, each DIP switch pulls the connected pin of the XS Board to ground. When the
DIP switch is open, the pin is pulled high through a 10KWresistor.
*
When not being used, the DIP switches should be left in the open configuration so the pins of
the XS Board are not tied to ground and can freely move between logic low and high levels.
When pressed, each pushbutton pulls the connected pin of the XS Board to ground. Otherwise,
the pin is pulled high through a 10 KW resistor.
Here are the connections from the XS40 and XS95 Boards to the switches on the XStend Board
expressed as UCF constraints (for the UCF syntax and usage tips, check out
http://www.xilinx.com/techdocs/2449.htm):
LOC=P1;
LOC=P2;
LOC=P3;
LOC=P75;
LOC=P79;
LOC=P82;
LOC=P83;
LOC=P84;
LOC=P58;
LOC=P56;
LOC=P54;
LOC=P55;
LOC=P53;
LOC=P57;
LOC=P61;
LOC=P34;
LOC=P44;
LOC=P43;
LOC=P41;
LOC=P40;
LOC=P39;
LOC=P37;
LOC=P36;
LOC=P35;
(There is a third pushbutton labelled