XESS XStend, Руководство пользователя

Страница: 21 / 34

019- NET A4 LOC=P79;
020- NET A5 LOC=P82;
021- NET A6 LOC=P83;
022- NET A7 LOC=P84;
023- NET A8 LOC=P58; # UPPER BYTE OF ADDRESS
024- NET A9 LOC=P56;
025- NET A10 LOC=P54;
026- NET A11 LOC=P55;
027- NET A12 LOC=P53;
028- NET A13 LOC=P57;
029- NET A14 LOC=P61;
030- #
031- # XS95 BOARD RAM CONTROL PINS
032- NET OE_
LOC=P62; # ACTIVE-LOW OUTPUT ENABLE
033- NET CE_ LOC=P65; # ACTIVE-LOW CHIP ENABLE
034- #
035- #
036- # XSTEND BOARD CONNECTIONS
037- #
038- # VGA CONNECTIONS
039- NET VSYNC_
LOC=P24;
040- NET HSYNC_ LOC=P15;
041- NET RED1 LOC=P14;
042- NET RED0 LOC=P18;
043- NET GREEN1 LOC=P17;
044- NET GREEN0 LOC=P19;
045- NET BLUE1 LOC=P23;
046- NET BLUE0 LOC=P21;
047- #
048- # PUSHBUTTON SWITCH CONNECTIONS (ACTIVE-LOW)
049- NET PUSH_RESET_
LOC=P10;
3.3 Using the PS/2 Keyboard Interface
This example creates a circuit that accepts scan codes from a keyboard attached to the PS/2
interface of the XStend Board and displays it on the LEDs. In addition, if a scan code for one of
the keys '0'—'9' arrives, then the numeral will be displayed on the right LED display of the
XStend Board. The ABEL code for this example is shown in
Listing 19 ; Listing 20 and Listing
21 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\EXP3. 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 EXP3.ABL for an XC4005XL FPGA.
•
Compile the synthesized netlist using the EXP3_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 to enable the LEDs. Place a shunt on jumper J11 to keep the XStend
codec disabled. Attach a keyboard to the PS/2 connector of the XStend Board.