wb_dma_ch_arb.v

DMA的实现,通过此文件以及后面的文件可以实现DMA,可以在CPU之外工作.

			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
		   end
 	   grant23:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[23] | advance)
		   begin
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
		   end
 	   grant24:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[24] | advance)
		   begin
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
		   end
 	   grant25:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[25] | advance)
		   begin
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
		   end
 	   grant26:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[26] | advance)
		   begin
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
		   end
 	   grant27:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[27] | advance)
		   begin
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
		   end
 	   grant28:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[28] | advance)
		   begin
			if(req[29])	next_state = grant29;
			else
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
		   end
 	   grant29:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[29] | advance)
		   begin
			if(req[30])	next_state = grant30;
			else
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
		   end
 	   grant30:
		// if this req is dropped or next is asserted, check for other req's
		if(!req[30] | advance)
		   begin
			if(req[0])	next_state = grant0;
			else
			if(req[1])	next_state = grant1;
			else
			if(req[2])	next_state = grant2;
			else
			if(req[3])	next_state = grant3;
			else
			if(req[4])	next_state = grant4;
			else
			if(req[5])	next_state = grant5;
			else
			if(req[6])	next_state = grant6;
			else
			if(req[7])	next_state = grant7;
			else
			if(req[8])	next_state = grant8;
			else
			if(req[9])	next_state = grant9;
			else
			if(req[10])	next_state = grant10;
			else
			if(req[11])	next_state = grant11;
			else
			if(req[12])	next_state = grant12;
			else
			if(req[13])	next_state = grant13;
			else
			if(req[14])	next_state = grant14;
			else
			if(req[15])	next_state = grant15;
			else
			if(req[16])	next_state = grant16;
			else
			if(req[17])	next_state = grant17;
			else
			if(req[18])	next_state = grant18;
			else
			if(req[19])	next_state = grant19;
			else
			if(req[20])	next_state = grant20;
			else
			if(req[21])	next_state = grant21;
			else
			if(req[22])	next_state = grant22;
			else
			if(req[23])	next_state = grant23;
			else
			if(req[24])	next_state = grant24;
			else
			if(req[25])	next_state = grant25;
			else
			if(req[26])	next_state = grant26;
			else
			if(req[27])	next_state = grant27;
			else
			if(req[28])	next_state = grant28;
			else
			if(req[29])	next_state = grant29;
		   end
	endcase
   end

endmodule