first import of dhwk.

[raggedstone] / heartbeat / source / pcidec.v

//  Copyright (C) 2005 Peio Azkarate, peio@opencores.org\r
//  Copyright (C) 2006 Jeff Carr, jcarr@opencores.org\r
//	Copyleft GPL v2\r
\r
module pcidec_new (clk_i, nrst_i, ad_i, cbe_i, idsel_i, bar0_i, memEN_i,\r
	pciadrLD_i, adrcfg_o, adrmem_o, adr_o, cmd_o);\r
\r
   	// General \r
	input clk_i;\r
   	input nrst_i;\r
	// pci \r
	input [31:0] ad_i;\r
	input [3:0] cbe_i;\r
	input idsel_i;\r
	// control\r
	input [31:25] bar0_i;\r
	input memEN_i;\r
	input pciadrLD_i;\r
	output adrcfg_o;\r
	output adrmem_o;\r
	output [24:1] adr_o;\r
	output [3:0] cmd_o;\r
\r
  	reg [31:0] adr;\r
  	reg [3:0] cmd;\r
  	reg idsel_s;\r
	wire a1;\r
\r
	//+-------------------------------------------------------------------------+\r
	//|  Load PCI Signals														|\r
	//+-------------------------------------------------------------------------+\r
\r
	always @( negedge nrst_i or posedge clk_i )\r
	begin\r
		if( nrst_i == 0 )\r
		begin\r
			adr <= 23'b1111_1111_1111_1111_1111_111;\r
			cmd <= 3'b111;\r
			idsel_s <= 1'b0;\r
		end\r
		else\r
			if ( pciadrLD_i == 1 )\r
			begin\r
				adr <= ad_i;\r
				cmd <= cbe_i;\r
				idsel_s <= idsel_i;\r
			end\r
	end\r
\r
	assign adrmem_o = (\r
		( memEN_i == 1'b1 ) &&\r
		( adr [31:25] == bar0_i ) &&\r
		( adr [1:0] == 2'b00 ) &&\r
		( cmd [3:1] == 3'b011 )\r
	) ? 1'b1 : 1'b0;\r
\r
	assign adrcfg_o = (\r
		( idsel_s == 1'b1 ) &&\r
		( adr [1:0] == 2'b00 ) &&\r
		( cmd [3:1] == 3'b101 )\r
	) ? 1'b1 : 1'b0;\r
\r
	assign a1 = ~ ( cbe_i [3] && cbe_i [2] );\r
	assign adr_o = {adr [24:2], a1};\r
	assign cmd_o = cmd;\r
\r
endmodule\r