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[/] [openmsp430/] [trunk/] [fpga/] [actel_m1a3pl_dev_kit/] [rtl/] [verilog/] [openmsp430/] [periph/] [template_periph_16b.v] - Rev 218
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//---------------------------------------------------------------------------- // Copyright (C) 2009 , Olivier Girard // // 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 authors nor the names of its 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 // //---------------------------------------------------------------------------- // // *File Name: template_periph_16b.v // // *Module Description: // 16 bit peripheral template. // // *Author(s): // - Olivier Girard, olgirard@gmail.com // //---------------------------------------------------------------------------- // $Rev: 103 $ // $LastChangedBy: olivier.girard $ // $LastChangedDate: 2011-03-05 15:44:48 +0100 (Sat, 05 Mar 2011) $ //---------------------------------------------------------------------------- module template_periph_16b ( // OUTPUTs per_dout, // Peripheral data output // INPUTs mclk, // Main system clock per_addr, // Peripheral address per_din, // Peripheral data input per_en, // Peripheral enable (high active) per_we, // Peripheral write enable (high active) puc_rst // Main system reset ); // OUTPUTs //========= output [15:0] per_dout; // Peripheral data output // INPUTs //========= input mclk; // Main system clock input [13:0] per_addr; // Peripheral address input [15:0] per_din; // Peripheral data input input per_en; // Peripheral enable (high active) input [1:0] per_we; // Peripheral write enable (high active) input puc_rst; // Main system reset //============================================================================= // 1) PARAMETER DECLARATION //============================================================================= // Register base address (must be aligned to decoder bit width) parameter [14:0] BASE_ADDR = 15'h0190; // Decoder bit width (defines how many bits are considered for address decoding) parameter DEC_WD = 3; // Register addresses offset parameter [DEC_WD-1:0] CNTRL1 = 'h0, CNTRL2 = 'h2, CNTRL3 = 'h4, CNTRL4 = 'h6; // Register one-hot decoder utilities parameter DEC_SZ = (1 << DEC_WD); parameter [DEC_SZ-1:0] BASE_REG = {{DEC_SZ-1{1'b0}}, 1'b1}; // Register one-hot decoder parameter [DEC_SZ-1:0] CNTRL1_D = (BASE_REG << CNTRL1), CNTRL2_D = (BASE_REG << CNTRL2), CNTRL3_D = (BASE_REG << CNTRL3), CNTRL4_D = (BASE_REG << CNTRL4); //============================================================================ // 2) REGISTER DECODER //============================================================================ // Local register selection wire reg_sel = per_en & (per_addr[13:DEC_WD-1]==BASE_ADDR[14:DEC_WD]); // Register local address wire [DEC_WD-1:0] reg_addr = {per_addr[DEC_WD-2:0], 1'b0}; // Register address decode wire [DEC_SZ-1:0] reg_dec = (CNTRL1_D & {DEC_SZ{(reg_addr == CNTRL1 )}}) | (CNTRL2_D & {DEC_SZ{(reg_addr == CNTRL2 )}}) | (CNTRL3_D & {DEC_SZ{(reg_addr == CNTRL3 )}}) | (CNTRL4_D & {DEC_SZ{(reg_addr == CNTRL4 )}}); // Read/Write probes wire reg_write = |per_we & reg_sel; wire reg_read = ~|per_we & reg_sel; // Read/Write vectors wire [DEC_SZ-1:0] reg_wr = reg_dec & {DEC_SZ{reg_write}}; wire [DEC_SZ-1:0] reg_rd = reg_dec & {DEC_SZ{reg_read}}; //============================================================================ // 3) REGISTERS //============================================================================ // CNTRL1 Register //----------------- reg [15:0] cntrl1; wire cntrl1_wr = reg_wr[CNTRL1]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl1 <= 16'h0000; else if (cntrl1_wr) cntrl1 <= per_din; // CNTRL2 Register //----------------- reg [15:0] cntrl2; wire cntrl2_wr = reg_wr[CNTRL2]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl2 <= 16'h0000; else if (cntrl2_wr) cntrl2 <= per_din; // CNTRL3 Register //----------------- reg [15:0] cntrl3; wire cntrl3_wr = reg_wr[CNTRL3]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl3 <= 16'h0000; else if (cntrl3_wr) cntrl3 <= per_din; // CNTRL4 Register //----------------- reg [15:0] cntrl4; wire cntrl4_wr = reg_wr[CNTRL4]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl4 <= 16'h0000; else if (cntrl4_wr) cntrl4 <= per_din; //============================================================================ // 4) DATA OUTPUT GENERATION //============================================================================ // Data output mux wire [15:0] cntrl1_rd = cntrl1 & {16{reg_rd[CNTRL1]}}; wire [15:0] cntrl2_rd = cntrl2 & {16{reg_rd[CNTRL2]}}; wire [15:0] cntrl3_rd = cntrl3 & {16{reg_rd[CNTRL3]}}; wire [15:0] cntrl4_rd = cntrl4 & {16{reg_rd[CNTRL4]}}; wire [15:0] per_dout = cntrl1_rd | cntrl2_rd | cntrl3_rd | cntrl4_rd; endmodule // template_periph_16b
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