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/*******************************************************************************
* <b>Module:</b>dsp_addsub_reg2_simd
* @file dsp_addsub_reg2_simd.v
* @date:2016-06-05
* @author: Andrey Filippov
*
* @brief: SIMD adder/subtracter with dual registers on the A-inputa
*
* @copyright Copyright (c) 2016 Elphel, Inc.
*
* <b>License:</b>
*
*dsp_addsub_reg2_simd.v 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, either version 3 of the License, or
* (at your option) any later version.
*
* dsp_addsub_reg2_simd.v 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/> .
*
* Additional permission under GNU GPL version 3 section 7:
* If you modify this Program, or any covered work, by linking or combining it
* with independent modules provided by the FPGA vendor only (this permission
* does not extend to any 3-rd party modules, "soft cores" or macros) under
* different license terms solely for the purpose of generating binary "bitstream"
* files and/or simulating the code, the copyright holders of this Program give
* you the right to distribute the covered work without those independent modules
* as long as the source code for them is available from the FPGA vendor free of
* charge, and there is no dependence on any encrypted modules for simulating of
* the combined code. This permission applies to you if the distributed code
* contains all the components and scripts required to completely simulate it
* with at least one of the Free Software programs.
*******************************************************************************/
`timescale 1ns/1ps
module dsp_addsub_reg2_simd#(
parameter NUM_DATA = 2,
parameter WIDTH = 24
)(
input clk,
input rst,
input [NUM_DATA * WIDTH -1:0] ain,
input [NUM_DATA * WIDTH -1:0] bin,
input cea1, // load first a registers
input cea2, // load second a registers
input ceb, // load first b registers
input subtract, // 0 - add, 1 - subtract
input cep, // load output registers
output [NUM_DATA * WIDTH -1:0] pout);
`ifdef INSTANTIATE_DSP48E1
wire [4:0] inmode = { 1'b1, // ~selb,
1'b0, // sub_d,
1'b0, // seld,
1'b0, // seld, // ~en_a,
1'b1}; // ~sela};
wire [3:0] alumode = {2'b0, // Z + X + Y + CIN / -Z +( X + Y + CIN) -1
1'b0,
subtract};
wire [6:0] opmode = {3'b011, // Z = C-input
2'b00, // Y = 0
2'b11}; // X = A:B
wire cryin = subtract;
DSP48E1 #(
.ACASCREG (2), // (1),
.ADREG (0), // (1),
.ALUMODEREG (1),
.AREG (2), // (1)
.AUTORESET_PATDET ("NO_RESET"),
.A_INPUT ("DIRECT"),
.BCASCREG (2), // (1),
.BREG (2), // (1)
.B_INPUT ("DIRECT"),
.CARRYINREG (1),
.CARRYINSELREG (1),
.CREG (1), //(1),
.DREG (0), //(1),
.INMODEREG (1),
.IS_ALUMODE_INVERTED (4'b0),
.IS_CARRYIN_INVERTED (1'b0),
.IS_CLK_INVERTED (1'b0),
.IS_INMODE_INVERTED (5'b0),
.IS_OPMODE_INVERTED (7'b0),
.MASK (48'hffffffffffff),
.MREG (0),
.OPMODEREG (1),
.PATTERN (48'h000000000000),
.PREG (1),
.SEL_MASK ("MASK"),
.SEL_PATTERN ("PATTERN"),
.USE_DPORT ("TRUE"), //("FALSE"),
.USE_MULT ("NONE"), //("MULTIPLY"),
.USE_PATTERN_DETECT ("NO_PATDET"),
.USE_SIMD ("TWO24") // ("ONE48")
) DSP48E1_i (
.ACOUT (), // output[29:0]
.BCOUT (), // output[17:0]
.CARRYCASCOUT (), // output
.CARRYOUT (), // output[3:0]
.MULTSIGNOUT (), // output
.OVERFLOW (), // output
.P (pout), // output[47:0]
.PATTERNBDETECT (), // output
.PATTERNDETECT (), // output
.PCOUT (), // output[47:0]
.UNDERFLOW (), // output
.A (ain[47:18]), // input[29:0]
.ACIN (30'b0), // input[29:0]
.ALUMODE (alumode), // input[3:0]
.B (ain[17:0]), // input[17:0]
.BCIN (18'b0), // input[17:0]
.C (bin), // input[47:0]
.CARRYCASCIN (1'b0), // input
.CARRYIN (cryin), // input
.CARRYINSEL (3'h0), // input[2:0] // later modify?
.CEA1 (cea1), // input
.CEA2 (cea2), // input
.CEAD (1'b0), // input
.CEALUMODE (1'b1), // input
.CEB1 (cea1), // input
.CEB2 (cea2), // input
.CEC (ceb), // input
.CECARRYIN (1'b1), // input
.CECTRL (1'b1), // input
.CED (1'b0), // input
.CEINMODE (1'b1), // input
.CEM (1'b1), // input
.CEP (cep), // input
.CLK (clk), // input
.D (25'h1ffffff),// input[24:0]
.INMODE (inmode), // input[4:0]
.MULTSIGNIN (1'b0), // input
.OPMODE (opmode), // input[6:0]
.PCIN (48'b0), // input[47:0]
.RSTA (rst), // input
.RSTALLCARRYIN (rst), // input
.RSTALUMODE (rst), // input
.RSTB (rst), // input
.RSTC (rst), // input
.RSTCTRL (rst), // input
.RSTD (rst), // input
.RSTINMODE (rst), // input
.RSTM (rst), // input
.RSTP (rst) // input
);
`else
reg [NUM_DATA * WIDTH -1:0] a1_reg;
reg [NUM_DATA * WIDTH -1:0] a2_reg;
reg [NUM_DATA * WIDTH -1:0] b_reg;
reg [NUM_DATA * WIDTH -1:0] p_reg;
reg sub_r;
wire [NUM_DATA * WIDTH -1:0] p_w;
assign pout = p_reg;
generate
genvar i;
for (i = 0; i < 4; i = i+1) begin: byte_fifo_block
assign p_w[WIDTH*i +: WIDTH] = a2_reg[WIDTH*i +: WIDTH] + sub_r ? -b_reg[WIDTH*i +: WIDTH] : b_reg[WIDTH*i +: WIDTH];
end
endgenerate
always @ (posedge clk) begin
if (rst) a1_reg <= 0;
else if (cea1) a1_reg <= ain;
if (rst) a2_reg <= 0;
else if (cea2) a2_reg <= a1_reg;
if (rst) b_reg <= 0;
else if (ceb) b_reg <= bin;
sub_r <= subtract;
if (rst) p_reg <= 0;
if (cep) p_reg <= p_w;
end
`endif
endmodule
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