Daughterboard Connector; Example Designs For The Xstend Board; Using The Leds And Switches - XESS XStend Manual

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To prevent damage, remove the XS40 or XS95 Board from the XStend Board when
constructing circuitry in the prototyping area.
Connections from the XS Board to the prototyping area are made through connector J3. The
arrangement of pins on this connector exactly matches the arrangement of pins on the XS40
Board. For example, the pin at the bottom-left of J3 on the XStend Board corresponds to pin 21
at the bottom-left of the XS40 Board.
The XS95 Board has a completely different pin arrangement than the XS40. Therefore each pin
on J3 is explicitly labelled with the corresponding pin number on the XS95 Board. For example,
the pin at the bottom-left of J3 on the XStend Board is connected to pin 68 near the top-left of
the XS95 Board.

2.9 Daughterboard Connector

Daughterboards with specialized circuitry can be connected to the XStend board through
connector J18. This 42×2 connector brings all the I/O and power/GND from the XS40 or XS95
Board to the daughterboard.

3 Example Designs for the XStend Board

Here are several examples of designs built using the XStend Board coupled with an XS40 or
XS95 Board.

3.1 Using the LEDs and Switches

This example creates a circuit that displays the settings of the DIP switches on the LEDs and
LED displays. The particular set of LEDs which is activated is selected by the SPARE and
RESET pushbuttons. The ABEL code for this example is shown in Listing 13; Listing 14 and
Listing 15 show the UCF files for using the XS40 and XS95 Boards with the XStend Board,
respectively.
The design files for this example should be found in C:\XST-PROJ\EXP1. The steps for
compiling and testing the design using an XS40 combined with an XStend Board are as follows:
• Synthesize the ABEL code in the EXP1.ABL for an XC4005XL FPGA.
• Compile the synthesized netlist using the EXP1_40.UCF constraint file.
• Mount an XS40 Board in the XStend Board and attach the downloading cable from the
XS40 to the PC parallel port. Apply 9VDC though jack J9 of the XS40. Place shunts on
jumpers J4, J7, and J8 of the XStend Board to enable the LED displays. Place a shunt on
jumper J11 to keep the XStend codec disabled.
• Download the EXP1.BIT file into the XS40/XStend combination with the command:
XSLOAD EXP1.BIT.