FIFO Verilog文档格式.docx

FIFO Verilog文档格式.docx

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F_FirstN,

F_EmptyN

）;

inputClk;

//CLKsignal.

inputRstN;

//LowAssertedResetsignal.

input[（`FWIDTH-1）:

0]Data_In;

//DataintoFIFO.

inputFInN;

//WriteintoFIFOSignal.

inputFClrN;

//ClearsignaltoFIFO.

inputFOutN;

//ReadfromFIFOsignal.

output[（`FWIDTH-1）:

0]F_Data;

//FIFOdataout.

outputF_FullN;

//FIFOfullindicatingsignal.

outputF_EmptyN;

//FIFOemptyindicatingsignal.

outputF_LastN;

//FIFOLastbutonesignal.

outputF_SLastN;

//FIFOSLastbutonesignal.

outputF_FirstN;

//Signalindicatingonlyone

//wordinFIFO.

regF_FullN;

regF_EmptyN;

regF_LastN;

regF_SLastN;

regF_FirstN;

reg[`FCWIDTH:

0]fcounter;

//counterindicatesnumofdatainFIFO

reg[（`FCWIDTH-1）:

0]rd_ptr;

//Currentreadpointer.

0]wr_ptr;

//Currentwritepointer.

wire[（`FWIDTH-1）:

0]FIFODataOut;

//DataoutfromFIFOMemBlk

0]FIFODataIn;

//DataintoFIFOMemBlk

wireReadN=FOutN;

wireWriteN=FInN;

assignF_Data=FIFODataOut;

assignFIFODataIn=Data_In;

FIFO_MEM_BLKmemblk（.clk（Clk）,

.writeN（WriteN）,

.rd_addr（rd_ptr）,

.wr_addr（wr_ptr）,

.data_in（FIFODataIn）,

.data_out（FIFODataOut）

//ControlcircuitryforFIFO.Ifresetorclrsignalisasserted,

//allthecountersaresetto0.Ifwriteonlythewritecounter

//isincrementedelseifreadonlyreadcounterisincremented

//elseifboth,readandwritecountersareincremented.

//fcounterindicatesthenumofitemsintheFIFO.Writeonly

//incrementsthefcounter,readonlydecrementsthecounter,and

//read&

&

writedoesn'

tchangethecountervalue.

always@（posedgeClkornegedgeRstN）

begin

if（!

RstN）begin

fcounter<

=0;

rd_ptr<

wr_ptr<

end

elsebegin

FClrN）begin

WriteN&

F_FullN）

=wr_ptr+1;

ReadN&

F_EmptyN）

=rd_ptr+1;

ReadN&

=fcounter+1;

elseif（WriteN&

!

=fcounter-1;

//AlltheFIFOstatussignalsdependsonthevalueoffcounter.

//Ifthefcounterisequaltofdepth,indicatesFIFOisfull.

//Ifthefcounterisequaltozero,indicatestheFIFOisempty.

//F_EmptyNsignalindicatesFIFOEmptyStatus.Bydefaultitis

//asserted,indicatingtheFIFOisempty.AftertheFirstDatais

//putintotheFIFOthesignalisdeasserted.

RstN）

F_EmptyN<

=1'

b0;

if（FClrN==1'

b1）begin

if（F_EmptyN==1'

b0&

WriteN==1'

b0）

b1;

elseif（F_FirstN==1'

ReadN==1'

b1）

else

//F_FirstNsignalindicatesthatthereisonlyonedatumsitting

//intheFIFO.WhentheFIFOisemptyandawritetoFIFOoccurs,

//thissignalgetsasserted.

F_FirstN<

if（（F_EmptyN==1'

b0）||

（fcounter==2&

b1））

elseif（F_FirstN==1'

（WriteN^ReadN））

//F_SLastNindicatesthatthereisspaceforonlytwodatawords

//intheFIFO.

F_SLastN<

if（（F_LastN==1'

b1）||

（fcounter==（`FDEPTH-3）&

elseif（F_SLastN==1'

（ReadN^WriteN））

//F_LastNindicatesthatthereisonespaceforonlyonedata

//wordintheFIFO.

F_LastN<

if（（F_FullN==1'

（fcounter==（`FDEPTH-2）&

elseif（F_LastN==1'

//F_FullNindicatesthattheFIFOisfull.

F_FullN<

if（F_LastN==1'

elseif（F_FullN==1'

endmodule

///////////////////////////////////////////////////////////////////

//

//Configurablememoryblockforfifo.Thewidthofthemem

//blockisconfigu