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[/] [wb4pb/] [trunk/] [rtl/] [picoblaze_wb_gpio.v] - Rev 8
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//////////////////////////////////////////////////////////////////////////////// // This sourcecode is released under BSD license. // Please see http://www.opensource.org/licenses/bsd-license.php for details! //////////////////////////////////////////////////////////////////////////////// // // Copyright (c) 2010, Stefan Fischer <Ste.Fis@OpenCores.org> // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // // * Redistributions of source code must retain the above copyright notice, // this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above copyright notice, // this list of conditions and the following disclaimer in the documentation // and/or other materials provided with the distribution. // * Neither the name of the author nor the names of his contributors may be // used to endorse or promote products derived from this software without // specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. // //////////////////////////////////////////////////////////////////////////////// // filename: picoblaze_wb_gpio.v // description: synthesizable PicoBlaze (TM) general purpose i/o example using // wishbone // todo4user: add other modules as needed // version: 0.0.0 // changelog: - 0.0.0, initial release // - ... //////////////////////////////////////////////////////////////////////////////// module picoblaze_wb_gpio ( p_rst_i, p_clk_i, p_gpio_io ); input p_rst_i; wire p_rst_i; input p_clk_i; wire p_clk_i; inout[7:0] p_gpio_io; wire [7:0] p_gpio_io; reg rst; wire clk; wire wb_cyc; wire wb_stb; wire wb_we; wire[7:0] wb_adr; wire[7:0] wb_dat_m2s; wire[7:0] wb_dat_s2m; wire wb_ack; wire pb_write_strobe; wire pb_read_strobe; wire[7:0] pb_port_id; wire[7:0] pb_in_port; wire[7:0] pb_out_port; wire[17:0] instruction; wire[9:0] address; wire interrupt; wire interrupt_ack; wire[7:0] gpio_in; wire[7:0] gpio_out; wire[7:0] gpio_oe; reg [7:0] gpio; parameter IS_INPUT = 1'b0; parameter IS_OUTPUT = ! IS_INPUT; integer i; // reset synchronisation always@(clk) begin rst <= p_rst_i; end assign clk = p_clk_i; // module instances /////////////////// kcpsm3 inst_kcpsm3 ( .address(address), .instruction(instruction), .port_id(pb_port_id), .write_strobe(pb_write_strobe), .out_port(pb_out_port), .read_strobe(pb_read_strobe), .in_port(pb_in_port), .interrupt(interrupt), .interrupt_ack(interrupt_ack), .reset(rst), .clk(clk) ); pbwbgpio inst_pbwbgpio ( .address(address), .instruction(instruction), .clk(clk) ); wbm_picoblaze inst_wbm_picoblaze ( .rst(rst), .clk(clk), .wbm_cyc_o(wb_cyc), .wbm_stb_o(wb_stb), .wbm_we_o(wb_we), .wbm_adr_o(wb_adr), .wbm_dat_m2s_o(wb_dat_m2s), .wbm_dat_s2m_i(wb_dat_s2m), .wbm_ack_i(wb_ack), .pb_port_id_i(pb_port_id), .pb_write_strobe_i(pb_write_strobe), .pb_out_port_i(pb_out_port), .pb_read_strobe_i(pb_read_strobe), .pb_in_port_o(pb_in_port) ); wbs_gpio inst_wbs_gpio ( .rst(rst), .clk(clk), .wbs_cyc_i(wb_cyc), .wbs_stb_i(wb_stb), .wbs_we_i(wb_we), .wbs_adr_i(wb_adr), .wbs_dat_m2s_i(wb_dat_m2s), .wbs_dat_s2m_o(wb_dat_s2m), .wbs_ack_o(wb_ack), .gpio_in_i(gpio_in), .gpio_out_o(gpio_out), .gpio_oe_o(gpio_oe) ); // i/o buffer generation assign gpio_in = p_gpio_io; always@(gpio_oe or gpio_out) begin for (i = 0; i <= 7; i = i + 1) begin if (gpio_oe[i] == IS_OUTPUT) gpio[i] = gpio_out[i]; else gpio[i] = 1'bZ; end end assign p_gpio_io = gpio; endmodule
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