piano.pnx

这是一个用vhdl写的电子琴的小程序（整个工程文件）

<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE ibis [
<!ELEMENT ibis (part, pin+)>
<!ELEMENT part EMPTY>
<!ELEMENT pin EMPTY>
<!ATTLIST part
  arch   CDATA #REQUIRED
  device CDATA #REQUIRED
  spg    CDATA #REQUIRED
  pkg    CDATA #REQUIRED>
<!ATTLIST pin
  nm     CDATA #REQUIRED
  no     CDATA #REQUIRED
  iostd  (TTL|LVTTL|LVCMOS2|NA) "NA"
  sr     (SLOW|FAST|slow|fast) "SLOW">
]>
<ibis><part pkg="PC84" spg="-15" arch="xc9500" device="XC95108"/><pin nm="\$Net00061_" no="52"/><pin nm="\$Net00060_" no="40"/><pin nm="\$Net00049_" no="41"/><pin nm="\$Net00042_" no="43"/><pin nm="\$Net00043_" no="44"/><pin nm="\$Net00045_" no="45"/><pin nm="\$Net00050_" no="51"/><pin nm="\$Net00064_" no="53"/><pin nm="\$Net00051_" no="50"/><pin nm="\$Net00046_" no="46"/><pin nm="\$Net00047_" no="47"/><pin nm="\$Net00048_" no="48"/><pin nm="\$Net00062_" no="37"/><pin nm="\$Net00041_" no="39"/><pin nm="\$Net00040_" no="9"/><pin nm="\$Net00059_" no="12"/><pin nm="\$Net00044_" no="63" sr="fast"/><pin nm="\$Net00057_" no="24" sr="fast"/><pin nm="\$Net00054_" no="23" sr="fast"/><pin nm="\$Net00055_" no="25" sr="fast"/><pin nm="\$Net00071_" no="65" sr="fast"/><pin nm="\$Net00037_" no="11" sr="fast"/><pin nm="\$Net00056_" no="62" sr="fast"/><pin nm="\$Net00058_" no="26" sr="fast"/><pin nm="\$Net00053_" no="61" sr="fast"/></ibis>