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[/] [s6soc/] [trunk/] [rtl/] [wbgpio.v] - Rev 33
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//////////////////////////////////////////////////////////////////////////////// // // Filename: wbgpio.v // // Project: CMod S6 System on a Chip, ZipCPU demonstration project // // Purpose: A General Purpose Input/Output controller. This controller // allows a user to read the current state of the 16-GPIO input // pins, or to set the state of the 16-GPIO output pins. Specific numbers // of pins are configurable from 1-16. // // Unlike other controllers, this controller offers no capability to // change input/output direction, or to implement pull-up or pull-down // resistors. It simply changes and adjusts the values going out the // output pins, while allowing a user to read the values on the input // pins. // // Any change of an input pin value will result in the generation of an // interrupt signal. // // Creator: Dan Gisselquist, Ph.D. // Gisselquist Technology, LLC // //////////////////////////////////////////////////////////////////////////////// // // Copyright (C) 2015-2016, Gisselquist Technology, LLC // // This program is free software (firmware): you can redistribute it and/or // modify it under the terms of the GNU General Public License as published // by the Free Software Foundation, either version 3 of the License, or (at // your option) any later version. // // This program is distributed in the hope that it will be useful, but WITHOUT // ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory, run make with no // target there if the PDF file isn't present.) If not, see // <http://www.gnu.org/licenses/> for a copy. // // License: GPL, v3, as defined and found on www.gnu.org, // http://www.gnu.org/licenses/gpl.html // // //////////////////////////////////////////////////////////////////////////////// // // module wbgpio(i_clk, i_wb_cyc, i_wb_stb, i_wb_we, i_wb_data, o_wb_data, i_gpio, o_gpio, o_int); parameter NIN=16, NOUT=16, DEFAULT=16'h00; input i_clk; // input i_wb_cyc, i_wb_stb, i_wb_we; input [31:0] i_wb_data; output wire [31:0] o_wb_data; // input [(NIN-1):0] i_gpio; output reg [(NOUT-1):0] o_gpio; // output reg o_int; // 9LUT's, 16 FF's always @(posedge i_clk) if ((i_wb_cyc)&&(i_wb_stb)&&(i_wb_we)) o_gpio <= ((o_gpio)&(~i_wb_data[(NOUT+16-1):16])) |((i_wb_data[(NOUT-1):0])&(i_wb_data[(NOUT+16-1):16])); reg [(NIN-1):0] x_gpio, r_gpio; // 3 LUTs, 33 FF's always @(posedge i_clk) begin x_gpio <= i_gpio; r_gpio <= x_gpio; o_int <= (x_gpio != r_gpio); end assign o_wb_data = { {(16-NIN){1'b0}}, r_gpio, {(16-NOUT){1'b0}}, o_gpio }; endmodule
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