Subversion Repositories hpdmc

/*

 * Milkymist VJ SoC

 * Copyright (C) 2007, 2008, 2009 Sebastien Bourdeauducq

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

/* Simple FML interface for HPDMC */

module hpdmc_busif #(

        parameter sdram_depth = 26

) (

        input sys_clk,

        input sdram_rst,

        input [sdram_depth-1:0] fml_adr,

        input fml_stb,

        input fml_we,

        output fml_ack,

        output mgmt_stb,

        output mgmt_we,

        output [sdram_depth-3-1:0] mgmt_address, /* in 64-bit words */

        input mgmt_ack,

        input data_ack

);

reg mgmt_stb_en;

assign mgmt_stb = fml_stb & mgmt_stb_en;

assign mgmt_we = fml_we;

assign mgmt_address = fml_adr[sdram_depth-1:3];

assign fml_ack = data_ack;

always @(posedge sys_clk) begin

        if(sdram_rst)

                mgmt_stb_en = 1'b1;

        else begin

                if(mgmt_ack)

                        mgmt_stb_en = 1'b0;

                if(data_ack)

                        mgmt_stb_en = 1'b1;

        end

end

endmodule