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[/] [openmsp430/] [trunk/] [core/] [rtl/] [verilog/] [periph/] [template_periph_8b.v] - Rev 188
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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_8b.v // // *Module Description: // 8 bit peripheral template. // // *Author(s): // - Olivier Girard, olgirard@gmail.com // //---------------------------------------------------------------------------- // $Rev: 134 $ // $LastChangedBy: olivier.girard $ // $LastChangedDate: 2012-03-22 21:31:06 +0100 (Thu, 22 Mar 2012) $ //---------------------------------------------------------------------------- module template_periph_8b ( // 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'h0090; // Decoder bit width (defines how many bits are considered for address decoding) parameter DEC_WD = 2; // Register addresses offset parameter [DEC_WD-1:0] CNTRL1 = 'h0, CNTRL2 = 'h1, CNTRL3 = 'h2, CNTRL4 = 'h3; // 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 = {1'b0, per_addr[DEC_WD-2:0]}; // Register address decode wire [DEC_SZ-1:0] reg_dec = (CNTRL1_D & {DEC_SZ{(reg_addr==(CNTRL1 >>1))}}) | (CNTRL2_D & {DEC_SZ{(reg_addr==(CNTRL2 >>1))}}) | (CNTRL3_D & {DEC_SZ{(reg_addr==(CNTRL3 >>1))}}) | (CNTRL4_D & {DEC_SZ{(reg_addr==(CNTRL4 >>1))}}); // Read/Write probes wire reg_lo_write = per_we[0] & reg_sel; wire reg_hi_write = per_we[1] & reg_sel; wire reg_read = ~|per_we & reg_sel; // Read/Write vectors wire [DEC_SZ-1:0] reg_hi_wr = reg_dec & {DEC_SZ{reg_hi_write}}; wire [DEC_SZ-1:0] reg_lo_wr = reg_dec & {DEC_SZ{reg_lo_write}}; wire [DEC_SZ-1:0] reg_rd = reg_dec & {DEC_SZ{reg_read}}; //============================================================================ // 3) REGISTERS //============================================================================ // CNTRL1 Register //----------------- reg [7:0] cntrl1; wire cntrl1_wr = CNTRL1[0] ? reg_hi_wr[CNTRL1] : reg_lo_wr[CNTRL1]; wire [7:0] cntrl1_nxt = CNTRL1[0] ? per_din[15:8] : per_din[7:0]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl1 <= 8'h00; else if (cntrl1_wr) cntrl1 <= cntrl1_nxt; // CNTRL2 Register //----------------- reg [7:0] cntrl2; wire cntrl2_wr = CNTRL2[0] ? reg_hi_wr[CNTRL2] : reg_lo_wr[CNTRL2]; wire [7:0] cntrl2_nxt = CNTRL2[0] ? per_din[15:8] : per_din[7:0]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl2 <= 8'h00; else if (cntrl2_wr) cntrl2 <= cntrl2_nxt; // CNTRL3 Register //----------------- reg [7:0] cntrl3; wire cntrl3_wr = CNTRL3[0] ? reg_hi_wr[CNTRL3] : reg_lo_wr[CNTRL3]; wire [7:0] cntrl3_nxt = CNTRL3[0] ? per_din[15:8] : per_din[7:0]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl3 <= 8'h00; else if (cntrl3_wr) cntrl3 <= cntrl3_nxt; // CNTRL4 Register //----------------- reg [7:0] cntrl4; wire cntrl4_wr = CNTRL4[0] ? reg_hi_wr[CNTRL4] : reg_lo_wr[CNTRL4]; wire [7:0] cntrl4_nxt = CNTRL4[0] ? per_din[15:8] : per_din[7:0]; always @ (posedge mclk or posedge puc_rst) if (puc_rst) cntrl4 <= 8'h00; else if (cntrl4_wr) cntrl4 <= cntrl4_nxt; //============================================================================ // 4) DATA OUTPUT GENERATION //============================================================================ // Data output mux wire [15:0] cntrl1_rd = {8'h00, (cntrl1 & {8{reg_rd[CNTRL1]}})} << (8 & {4{CNTRL1[0]}}); wire [15:0] cntrl2_rd = {8'h00, (cntrl2 & {8{reg_rd[CNTRL2]}})} << (8 & {4{CNTRL2[0]}}); wire [15:0] cntrl3_rd = {8'h00, (cntrl3 & {8{reg_rd[CNTRL3]}})} << (8 & {4{CNTRL3[0]}}); wire [15:0] cntrl4_rd = {8'h00, (cntrl4 & {8{reg_rd[CNTRL4]}})} << (8 & {4{CNTRL4[0]}}); wire [15:0] per_dout = cntrl1_rd | cntrl2_rd | cntrl3_rd | cntrl4_rd; endmodule // template_periph_8b
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