veriloguart

/基于FPGA的串口扩展模块要求利用FPGA将PC机的串口扩展为5个子串口，5个子串口均为双向串口；通过地址线选择子串口地址，实现PC机与子串口之间的双向通信；可以方便的配置各个串口的通信参数，波特率可以设置为1200、2400、9600、57600、115200中的任意一个；数据位可以设置为5、6、7、8；校验位可以设置成N、O、E；/顶层模块MODULEUARTCLK,RST_N,RECEIVE,ADDR,CBPS,CSTOP,CJY,CDATA,SEND,RECEIVE1,LED,RECEIVE2,RECEIVE3,RECEIVE4,RECEIVE5,SEND1,SEND2,SEND3,SEND4,SEND5,V3_3INPUTCLK/系统时钟50MHZINPUTRST_N/复位信号，高有效INPUTRECEIVE/串口接收口INPUT20ADDR/串口地址INPUT20CBPS/波特率选择信号INPUTCSTOP/停止位选择信号INPUT10CJY/校验位选择信号INPUT10CDATA/数据位选择信号INPUTSEND1,SEND2,SEND3,SEND4,SEND5OUTPUTRECEIVE1,RECEIVE2,RECEIVE3,RECEIVE4,RECEIVE5OUTPUTSEND/串口发送端OUTPUT70LEDOUTPUT10V3_3WIRE70DATA1,DATA2/连接接收模块与发送模块，以便数据传输WIREBAUD_START1,BAUD_START2,BAUD_START3,BAUD_START4/BAUD_START1接收模块的波特率启动标志位；/BAUD_START2发送模块的波特率启动标志位；/BAUD_START3发送模块的波特率启动标志位；/BAUD_START4发送模块的波特率启动标志位；WIREMID_FLAG1,MID_FLAG2,MID_FLAG3,MID_FLAG4/MID_FLAG1接收数据标志位，由接收波特率发生模块发来；/MID_FLAG2发送数据标志位，由发送波特率发生模块发来；/MID_FLAG3接收数据标志位，由接收波特率发生模块发来；/MID_FLAG4发送数据标志位，由发送波特率发生模块发来；WIREINTERRUPT1,INTERRUPT2/接收完数据的标志位，同时也是发送数据的启示标志位；WIREMRECEIVE,MSEND/中间接收与发送/本程序采用模块化设计，即模块例化，分为4个模块，其中两个波特率发生模块共用注意例化的格式很重要/ASSIGNLEDDATA1|DATA2SPEED_SELECTBAUD_RECEIVE1CLKCLK,RST_NRST_N,BAUD_STARTBAUD_START1,CBPSCBPS,MID_FLAGMID_FLAG1/模块1接收数据的波特率发生模块/MY_UART_RXRECSIVE1CLKCLK,RST_NRST_N,RECEIVERECEIVE,CSTOPCSTOP,CJYCJY,CDATACDATA,BAUD_STARTBAUD_START1,MID_FLAGMID_FLAG1,RX_INTINTERRUPT1,RX_DATADATA1/模块2数据接收模块/SPEED_SELECTBAUD_SEND1CLKCLK,RST_NRST_N,BAUD_STARTBAUD_START2,CBPSCBPS,MID_FLAGMID_FLAG2/模块3发送数据的波特率发生模块/MY_UART_TXMIDSENDCLKCLK,RST_NRST_N,SENDMSEND,CSTOPCSTOP,CJYCJY,CDATACDATA,BAUD_STARTBAUD_START2,MID_FLAGMID_FLAG2,TX_INTINTERRUPT1,TX_DATADATA1/模块4数据发送模块/SPEED_SELECTBAUD_RECEIVE2CLKCLK,RST_NRST_N,BAUD_STARTBAUD_START3,CBPSCBPS,MID_FLAGMID_FLAG3/模块5接收数据的波特率发生模块/MY_UART_RXRECSIVE2CLKCLK,RST_NRST_N,RECEIVEMRECEIVE,CSTOPCSTOP,CJYCJY,CDATACDATA,BAUD_STARTBAUD_START3,MID_FLAGMID_FLAG3,RX_INTINTERRUPT2,RX_DATADATA2/模块6数据接收模块/SPEED_SELECTBAUD_SEND2CLKCLK,RST_NRST_N,BAUD_STARTBAUD_START4,CBPSCBPS,MID_FLAGMID_FLAG4/模块7发送数据的波特率发生模块/MY_UART_TXFSENDCLKCLK,RST_NRST_N,SENDSEND,CSTOPCSTOP,CJYCJY,CDATACDATA,BAUD_STARTBAUD_START4,MID_FLAGMID_FLAG4,TX_INTINTERRUPT2,TX_DATADATA2/模块8数据发送模块CHOOSECHOOSE1ADDRADDR,MSENDMSEND,SEND1SEND1,SEND2SEND2,SEND3SEND3,SEND4SEND4,SEND5SEND5,MRECEIVEMRECEIVE,RECEIVE1RECEIVE1,RECEIVE2RECEIVE2,RECEIVE3RECEIVE3,RECEIVE4RECEIVE4,RECEIVE5RECEIVE5,V3_3V3_3ENDMODULE/OVER/接收模块MODULEMY_UART_RXCLK,RST_N,RECEIVE,MID_FLAG,CSTOP,CJY,CDATA,BAUD_START,RX_DATA,RX_INTINPUTCLKINPUTRST_NINPUTRECEIVEINPUTCSTOP/停止位位数选择。INPUT10CJYINPUT10CDATAINPUTMID_FLAGOUTPUTBAUD_STARTOUTPUTREG70RX_DATAOUTPUTRX_INT/利用按键消抖原理，先后采样接收端的的电平进行对比，以判断是否有下降沿REGRECEIVE0,RECEIVE1,RECEIVE2,RECEIVE3ALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINRECEIVE01B0RECEIVE11B0RECEIVE21B0RECEIVE31B0ENDELSEBEGINRECEIVE0RECEIVERECEIVE1RECEIVE0RECEIVE2RECEIVE1RECEIVE3RECEIVE2ENDENDWIRENEG_RECEIVERECEIVE3/如果有下降沿来临，即NEG_RECEIVE为1时，波特率发生标志位置1，接收数据标志置1；/一旦数据接收结束，即NUM为12时，关断波特率发生器，接收数据标志清零；REGBAUD_START_R,RX_INT_RREG30NUMALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINBAUD_START_R1B0RX_INT_R1B0ENDELSEIFNEG_RECEIVEBEGINBAUD_START_R1B1RX_INT_R1B1ENDELSEIFNUM4D11BEGINBAUD_START_R1B0RX_INT_R1B0ENDENDASSIGNBAUD_STARTBAUD_START_RASSIGNRX_INTRX_INT_R/NUM接收位数标志；/BUFFER接收数据缓冲器；/DATA数据寄存器/波特率发生模块发来采样标志信号（MID_FLAG为1）后就进行采样REG70BUFFERALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINRX_DATA8D0BUFFER8D0NUM4D0ENDELSEIFRX_INT_RBEGINIFMID_FLAGBEGINNUMNUM1B1/注意此句与下面CASE语句是并行的，即CASE中的NUM是自加1之前的值CASENUM/NUM0时为起始位，不存储4D1BUFFER0RECEIVE4D2BUFFER1RECEIVE4D3BUFFER2RECEIVE4D4BUFFER3RECEIVE4D5BUFFER4RECEIVE4D6BUFFER5RECEIVE4D7BUFFER6RECEIVE4D8BUFFER7RECEIVE/NUM9时为结束位，不存储DEFAULTENDCASEENDELSEIFNUM6ELSENUM4D10ENDELSEIFNUM4D11BEGINNUM4D0RX_DATABUFFERENDENDEND/ENDMODULE/OVER/发送模块MODULEMY_UART_TXCLK,RST_N,SEND,MID_FLAG,CSTOP,CJY,CDATA,TX_DATA,TX_INT,BAUD_STARTINPUTCLKINPUTRST_NINPUTMID_FLAGINPUTCSTOP/停止位位数选择。INPUT10CJYINPUT10CDATAINPUT70TX_DATAINPUTTX_INTOUTPUTBAUD_STARTOUTPUTSEND/利用按键消抖原理，先后采样接收数据标志位TX_INT的电平，以判断是否有下降沿产生REGINT0,INT1,INT2ALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGININT01B0INT11B0INT21B0ENDELSEBEGININT0TX_INTINT1INT0INT2INT1ENDENDWIREINT_LOCKINT1/如果TX_INT有下降沿产生，即INT_LOCK为1，就启动波特率发生器，同时使能发送数据,/并将接收模块发来的数据送入发送数据缓冲器/如果发送数据结束，即NUM11时，波特率关断，发送使能清零，发送数据缓冲器清零；REGBAUD_START_T,SEND_ENREG70DATAREG30NUMALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINBAUD_START_T1B0SEND_EN1B0DATA8D0ENDELSEIFINT_LOCKBEGINBAUD_START_T1B1SEND_EN1B1DATATX_DATAENDELSEIFNUM4D11BEGINBAUD_START_T1B0SEND_EN1B0DATA8D0ENDENDASSIGNBAUD_STARTBAUD_START_T/SEND_R数据输出寄存器；/NUM发送数据位数；REGSEND_RALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINNUM1B0SEND_R1B0ENDELSEIFSEND_ENBEGINIFMID_FLAGBEGINNUMNUM1B1CASENUM4D0SEND_R1B0/起始信号0；4D1SEND_RDATA04D2SEND_RDATA14D3SEND_RDATA24D4SEND_RDATA34D5SEND_RDATA44D6SEND_RDATA54D7SEND_RDATA64D8SEND_RDATA74D9BEGINIFCJY1/奇校验BEGINCASECDATA2D0SEND_RDATA0DATA1DATA2DATA3DATA42D1SEND_RDATA0DATA1DATA2DATA3DATA4DATA52D2SEND_RDATA0DATA1DATA2DATA3DATA4DATA5DATA62D3SEND_RDATA0DATA1DATA2DATA3DATA4DATA5DATA6DATA7ENDCASEENDELSEIFCJY2|CJY3/偶校验BEGINCASECDATA2D0SEND_RDATA0DATA1DATA2DATA3DATA42D1SEND_RDATA0DATA1DATA2DATA3DATA4DATA52D2SEND_RDATA0DATA1DATA2DATA3DATA4DATA5DATA62D3SEND_RDATA0DATA1DATA2DATA3DATA4DATA5DATA6DATA7ENDCASEENDEND4D10SEND_R1B1/结束信号1；4D11SEND_R1B1/结束信号1；DEFAULTSEND_R1B1ENDCASEENDELSEIFNUM6ELSENUM4D10ENDELSEIFNUM4D11NUM4D0ENDELSESEND_R1B1ENDASSIGNSENDSEND_R/ENDMODULE/OVER/波特率模块MODULESPEED_SELECTCLK,RST_N,BAUD_START,CBPS,MID_FLAGINPUTCLKINPUTRST_NINPUTBAUD_STARTINPUT20CBPS/波特率选择信号OUTPUTMID_FLAGPARAMETERBPS120016D41666,/波特率为1200BPSBPS240016D20832,/波特率为2400BPSBPS960016D5207,/波特率为9600BPSBPS5760016D867,/波特率为57600BPSBPS11520016D433/波特率为115200BPSPARAMETERBPS1200_216D20833,BPS2400_216D10416,BPS9600_216D2603,BPS57600_216D433,BPS115200_216D216REG150CNT/分频计数REG150MAX_CNTREG150M_CNTREGMID_FLAG_R/波特率时钟寄存器ASSIGNMID_FLAGMID_FLAG_RALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NBEGINMAX_CNT1B0M_CNT1B0ENDELSEBEGINCASECBPS3D0BEGINMAX_CNTBPS1200M_CNTBPS1200_2END3D1BEGINMAX_CNTBPS2400M_CNTBPS2400_2END3D2BEGINMAX_CNTBPS9600M_CNTBPS9600_2END3D3BEGINMAX_CNTBPS57600M_CNTBPS57600_2END3D4BEGINMAX_CNTBPS115200M_CNTBPS115200_2ENDDEFAULTENDCASEENDEND/ENDALWAYSALWAYSPOSEDGECLKORPOSEDGERST_NBEGINIFRST_NCNT1B0ELSEIFCNTMAX_CNT|BAUD_STARTCNT1B0/波特率计数清零ELSECN