【文章內(nèi)容簡介】 ndex=0000。whenothers=null。endcase。endprocess。end。圖71NoteTabs模塊圖“上學歌”音樂設(shè)計的VHDL程序libraryieee。 。 。 entityNoteTabsis port(clk:instd_logic。 toneindex:outstd_logic_vector(3downto0))。 end。 architectureoneofNoteTabsis signalcounter:integerrange0to36。 begin t8:process(clk,counter) begin ifcounter=36then counter=0。 elsif(clk39。eventandclk=39。139。)then counter=counter+1。 endif。 endprocess。 search:process(counter)begincasecounteriswhen00=toneindex=1000。when01=toneindex=1001。when02=toneindex=1010。when03=toneindex=1000。when04=toneindex=1100。when05=toneindex=1100。when06=toneindex=1100。when07=toneindex=1100。when08=toneindex=1101。when09=toneindex=1101。when10=toneindex=1111。when11=toneindex=1101。when12=toneindex=1100。when13=toneindex=1100。when14=toneindex=1100。when15=toneindex=1100。when16=toneindex=1101。when17=toneindex=1101。when18=toneindex=1111。when19=toneindex=1111。when20=toneindex=1100。when21=toneindex=1101。when22=toneindex=1010。when23=toneindex=1010。when24=toneindex=1101。when25=toneindex=1100。when26=toneindex=1010。when27=toneindex=1100。when28=toneindex=1010。when29=toneindex=1000。when30=toneindex=1001。when31=toneindex=1010。when32=toneindex=1000。when33=toneindex=1000。when34=toneindex=1000。when35=toneindex=1000。when36=toneindex=0000。whenothers=null。endcase。endprocess。end。圖72NoteTabs1模塊圖“一剪梅”音樂設(shè)計的VHDL程序libraryieee。 。 。 entityNoteTabs2is port(clk:instd_logic。 toneindex:outstd_logic_vector(3downto0))。 end。 architectureoneofNoteTabs2is signalcounter:integerrange0to226。 begin t8:process(clk,counter) begin ifcounter=226then counter=0。 elsif(clk39。eventandclk=39。139。)then counter=counter+1。 endif。 endprocess。 search:process(counter)begincasecounteriswhen00=toneindex=0110。when01=toneindex=0110。when02=toneindex=0110。when03=toneindex=0110。when04=toneindex=0110。when05=toneindex=0110。when06=toneindex=0000。when07=toneindex=0110。when08=toneindex=0110。when09=toneindex=1010。when10=toneindex=1010。when11=toneindex=1001。when12=toneindex=1000。when13=toneindex=0111。when14=toneindex=1000。when15=toneindex=0111。when16=toneindex=0110。when17=toneindex=0101。when18=toneindex=0110。when19=toneindex=0110。when20=toneindex=0110。when21=toneindex=0110。when22=toneindex=0110。when23=toneindex=0110。when24=toneindex=0000。when25=toneindex=0110。when26=toneindex=1000。when27=toneindex=1000。when28=toneindex=1000。when29=toneindex=0110。when30=toneindex=1000。when31=toneindex=1001。when32=toneindex=1001。when33=toneindex=1010。when34=toneindex=1011。when35=toneindex=1010。when36=toneindex=1001。when37=toneindex=1010。when38=toneindex=1010。when39=toneindex=1010。when40=toneindex=1010。when41=toneindex=1010。when42=toneindex=1010。when43=toneindex=0000。when44=toneindex=1010。when45=toneindex=1100。when46=toneindex=1101。when47=toneindex=1101。when48=toneindex=1101。when49=toneindex=1100。when50=toneindex=1010。when51=toneindex=1001。when52=toneindex=1001。when53=toneindex=1001。when54=toneindex=1000。when55=toneindex=1001。when56=toneindex=1010。when57=toneindex=1010。when58=toneindex=1010。when59=toneindex=1001。when60=toneindex=1010。when61=toneindex=0101。when62=toneindex=0101。when63=toneindex=0110。when64=toneindex=0110。when65=toneindex=0110。when66=toneindex=0110。when67=toneindex=0111。when68=toneindex=0111。when69=toneindex=0110。when70=toneindex=0101。when71=toneindex=0101。when72=toneindex=0011。when73=toneindex=1000。when74=toneindex=0111。when75=toneindex=0110。when76=toneindex=0110。when77=toneindex=0110。when78=toneindex=0110。when79=toneindex=0110。when80=toneindex=0110。when81=toneindex=0000。when82=toneindex=0110。when83=toneindex=0110。when84=toneindex=0110。when85=toneindex=0110。when86=toneindex=0110。when87=toneindex=0110。when88=toneindex=0110。when89=toneindex=0110。when90=toneindex=0000。when91=toneindex=0110。when92=toneindex=1101。when93=toneindex=1101。when94=toneindex=1100。when95=toneindex=1010。when96=toneindex=1100。when97=toneindex=1010。when98=toneindex=1100。when99=toneindex=1101。when100=toneindex=1100。when101=toneindex=1001。when102=toneindex=1001。when103=toneindex=1010。when104=toneindex=1100。when105=toneindex=1010。when106=toneindex=1001。when107=toneindex=1010。when108=toneindex=1010。when109=toneindex=1010。when110=toneindex=1000。when111=toneindex=0110。when112=toneindex=0110。when113=toneindex=0110。when114=toneindex=0110。when115=toneindex=1010。when116=toneindex=1001。when117=toneindex=1010。when118=toneindex=1010。when119=toneindex=1100。when120=toneindex=1101。when121=toneindex=1010。when122=toneindex=1001。when123=toneindex=1010。when124=toneindex=1010。when125=toneindex=1010。when126=toneindex=1010。when127=toneindex=1010。when128=toneindex=1010。when129=toneindex=1010。when130=toneindex=0110。when131=toneindex=1101。when132=toneindex=1101。when133=toneindex=1100。when134=toneindex=1010。when135=toneindex=1100。when136=toneindex=1010。when137=toneindex=1100。when138=toneindex=1101。when139=toneindex=1101。when140=toneindex=1100。when141=toneindex=1001。when142=toneindex=1001。when143=toneindex=1010。when144=toneindex=1100。when145=toneindex=1010。when146=toneindex=1001。when147=toneindex=1010。when148=toneindex=1001。when149=toneindex=1010。when150=toneindex=1010。when151=toneindex=1010。when152=toneindex=1000。when153=toneindex=0110。when154=toneindex=0110。when155=toneindex=0110。when156=toneindex=0110。when157=toneindex=1010。when158=toneindex=1001。when159=toneindex=1010。when160=toneindex=1010。when161=toneindex=1100。w