sam9261.v

atmel公司arm926 开发办cpld源代码vhdl写的

module sam9261(NRST,CFOE,CFWE,CFIOW,CFIOR,A,A22,A25_CFRNW,CFS0,CFS1,CFCE1,CFCE2,PA29,PA30,PA31,NWAIT,IRQ1,IRQ2,
	CF_NRST,CF_OE,CF_WE,CF_IOWE,CF_IORD,CF_A,CF_REG,BUF_DIR,BUF_CS,CF_CE1,CF_CE2,CF_CD1,CF_CD2,CF_NWAIT,CF_IRQ,CF_WP);
    input NRST;
    input CFOE;
    input CFWE;
    input CFIOW;
    input CFIOR;
	input [10:0] A;
	input A22;
	input A25_CFRNW;	//PC3
	input CFS0;			//PC4
	input CFS1;			//PC5
	input CFCE1;		//PC6
	input CFCE2;		//PC7
	input PA29;		//Card detect
	input PA30;			//no use
	input PA31;			//no use
	input NWAIT;		//PC2
	output IRQ2;		//PB29
	input IRQ1;			//PB30

	output CF_NRST;
	output CF_OE;
	output CF_WE;
	output CF_IOWE;
	output CF_IORD;
	output [10:0] CF_A;
	output CF_REG;
	output BUF_DIR;
	output BUF_CS;
	output CF_CE1;
	output CF_CE2;
	input CF_CD1;
	input CF_CD2;
	input CF_NWAIT;
	input CF_IRQ;
	input CF_WP;

	reg [1:0] cf_ce_temp;

//    assign CF_NRST=NRST;  
    assign CF_NRST=PA30; 
//    assign CF_OE=CFOE;  
   assign CF_OE=0;
//   assign CF_WE=CFWE; 
    assign CF_WE=1; 
//    assign CF_IOWE=CFIOW;
//    assign CF_IORD=CFIOR; 
    assign CF_IOWE=CFWE;
    assign CF_IORD=CFOE; 


    	 assign CF_A[0]=A[2];
    	 assign CF_A[1]=A[3];
    	 assign CF_A[2]=A[4];

    	 assign CF_A[3]=0;
    	 assign CF_A[4]=0;
    	 assign CF_A[5]=0;
    	 assign CF_A[6]=0;
    	 assign CF_A[7]=0;
    	 assign CF_A[8]=0;
    	 assign CF_A[9]=0;
    	 assign CF_A[10]=0;

    assign CF_REG=1;
//    assign CF_REG=A22;
//    assign BUF_DIR=~A25_CFRNW;
    assign BUF_DIR=CFOE;
    assign BUF_CS=CFS0;					//CFS1
//    assign CF_CE1=CFCE1;
//    assign CF_CE2=CFCE2;
always @(CFS0 or CFOE or CFWE)
begin
	if(!CFS0)
			cf_ce_temp = A[6:5];
	else
			cf_ce_temp = 3;
end

    assign CF_CE1 = cf_ce_temp[0];
    assign CF_CE2 = cf_ce_temp[1];

    assign PA29=CF_CD1||CF_CD2; 		//card detect
//    assign PA29=CF_CD1||CF_CD2||PA30||PA31||CFS1||CF_WP; 		//card detect
 
    assign NWAIT=CF_NWAIT;
//    assign IRQ1=CF_IRQ; 				//CAN IRQ  //look out
    assign IRQ2=CF_IRQ;					//CF Card interrupt


endmodule