Chapter 4: Programming 4-9
Configurable Key Click Tone
TheFPGAhastheabilitytosoundashortchirpwheneverakeyis
pressed,providingauditoryfeedbacktoanoperatorofthekeyboard.
Thisauditoryfeedbackisoptional.TheFPGAmaybeconfiguredto
makethesoundornottomakethesound,dependingontheparticular
application.
USB DynaKey Tone Frequencies
The
frequencyistransmittedtotheFPGAasaNoteNumber.Note
numbersareequivalenttospecificfrequencies.Thenotenumbersent
totheFPGAisselectedbyroundingtherequestedfrequencytothe
nearestfrequencynumbergivenbythetableofNoteNumbers(N)and
Frequencies(freq)listed
inthefollowingtable.
NoteNumbersandFrequencies
Note N freq N freq N freq N freq N freq N freq
A
0 28 24 110 48 440 72 1760 96 7040 120 28160
Bb
1 29 25 117 49 466 73 1865 97 7459 121 29834
B
2 31 26 123 50 494 74 1976 98 7902 122 31609
C
3 33 27 131 51 523 75 2093 99 8372 123 33488
Db
4 35 28 139 52 554 76 2217 100 8870 124 35479
D
5 37 29 147 53 587 77 2349 101 9397 125 37589
Eb
6 39 30 156 54 622 78 2489 102 9956 126 39824
E
7 41 31 165 55 659 79 2637 103 10548 127 42192
F
8 44 32 175 56 698 80 2794 104 11175
Gb
9 46 33 185 57 740 81 2960 105 11840
G
10 49 34 196 58 784 82 3136 106 12544
Ab
11 52 35 208 59 831 83 3322 107 13290
A
12 55 36 220 60 880 84 3520 108 14080
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