diff options
Diffstat (limited to 'rtl/modular')
| -rw-r--r-- | rtl/modular/modular_multiplier_256.v | 402 | ||||
| -rw-r--r-- | rtl/modular/modular_reductor_256.v | 692 |
2 files changed, 0 insertions, 1094 deletions
diff --git a/rtl/modular/modular_multiplier_256.v b/rtl/modular/modular_multiplier_256.v deleted file mode 100644 index 2b35233..0000000 --- a/rtl/modular/modular_multiplier_256.v +++ /dev/null @@ -1,402 +0,0 @@ -//------------------------------------------------------------------------------ -// -// modular_multiplier_256.v -// ----------------------------------------------------------------------------- -// Modular multiplier. -// -// Authors: Pavel Shatov -// -// Copyright (c) 2015-2016, NORDUnet A/S -// -// 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 NORDUnet 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. -// -//------------------------------------------------------------------------------ - -module modular_multiplier_256 - ( - clk, rst_n, - ena, rdy, - a_addr, b_addr, n_addr, p_addr, p_wren, - a_din, b_din, n_din, p_dout - ); - - - // - // Constants - // - localparam OPERAND_NUM_WORDS = 8; - localparam WORD_COUNTER_WIDTH = 3; - - - // - // Handy Numbers - // - localparam [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_ZERO = 0; - localparam [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_LAST = OPERAND_NUM_WORDS - 1; - - - // - // Handy Functions - // - function [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_NEXT_OR_ZERO; - input [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_CURRENT; - begin - WORD_INDEX_NEXT_OR_ZERO = (WORD_INDEX_CURRENT < WORD_INDEX_LAST) ? - WORD_INDEX_CURRENT + 1'b1 : WORD_INDEX_ZERO; - end - endfunction - - function [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_PREVIOUS_OR_LAST; - input [WORD_COUNTER_WIDTH-1:0] WORD_INDEX_CURRENT; - begin - WORD_INDEX_PREVIOUS_OR_LAST = (WORD_INDEX_CURRENT > WORD_INDEX_ZERO) ? - WORD_INDEX_CURRENT - 1'b1 : WORD_INDEX_LAST; - end - endfunction - - - // - // Ports - // - input wire clk; // system clock - input wire rst_n; // active-low async reset - - input wire ena; // enable input - output wire rdy; // ready output - - output wire [WORD_COUNTER_WIDTH-1:0] a_addr; // index of current A word - output wire [WORD_COUNTER_WIDTH-1:0] b_addr; // index of current B word - output wire [WORD_COUNTER_WIDTH-1:0] n_addr; // index of current N word - output wire [WORD_COUNTER_WIDTH-1:0] p_addr; // index of current P word - output wire p_wren; // store current P word now - - input wire [ 31:0] a_din; // A - input wire [ 31:0] b_din; // B - input wire [ 31:0] n_din; // N (must be P-256!) - output wire [ 31:0] p_dout; // P = A * B mod N - - - // - // Word Indices - // - reg [WORD_COUNTER_WIDTH-1:0] index_a; - reg [WORD_COUNTER_WIDTH-1:0] index_b; - - /* map registers to output ports */ - assign a_addr = index_a; - assign b_addr = index_b; - - // - // FSM - // - localparam FSM_SHREG_WIDTH = (1 * OPERAND_NUM_WORDS + 1) + (2 * OPERAND_NUM_WORDS + 1) + (2 * OPERAND_NUM_WORDS + 2) + (0 * OPERAND_NUM_WORDS + 2) + 1; - - reg [FSM_SHREG_WIDTH-1:0] fsm_shreg; - - assign rdy = fsm_shreg[0]; - - wire [1 * OPERAND_NUM_WORDS-1:0] fsm_shreg_inc_index_a = fsm_shreg[FSM_SHREG_WIDTH - (0 * OPERAND_NUM_WORDS + 1) : FSM_SHREG_WIDTH - (1 * OPERAND_NUM_WORDS + 0)]; - wire [1 * OPERAND_NUM_WORDS-1:0] fsm_shreg_store_word_a = fsm_shreg[FSM_SHREG_WIDTH - (0 * OPERAND_NUM_WORDS + 2) : FSM_SHREG_WIDTH - (1 * OPERAND_NUM_WORDS + 1)]; - wire [2 * OPERAND_NUM_WORDS-1:0] fsm_shreg_inc_index_b = fsm_shreg[FSM_SHREG_WIDTH - (1 * OPERAND_NUM_WORDS + 1) : FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 1)]; - wire [2 * OPERAND_NUM_WORDS-2:0] fsm_shreg_store_si_msb = fsm_shreg[FSM_SHREG_WIDTH - (1 * OPERAND_NUM_WORDS + 2) : FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 1)]; - wire [0 * OPERAND_NUM_WORDS-0:0] fsm_shreg_store_si_lsb = fsm_shreg[FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 2) : FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 2)]; - wire [2 * OPERAND_NUM_WORDS-2:0] fsm_shreg_shift_si = fsm_shreg[FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 3) : FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 1)]; - wire [0 * OPERAND_NUM_WORDS-0:0] fsm_shreg_mask_cw1_sum = fsm_shreg[FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 4) : FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 4)]; - wire [2 * OPERAND_NUM_WORDS-1:0] fsm_shreg_store_c_word = fsm_shreg[FSM_SHREG_WIDTH - (3 * OPERAND_NUM_WORDS + 5) : FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 4)]; - wire [0 * OPERAND_NUM_WORDS-0:0] fsm_shreg_reduce_start = fsm_shreg[FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 5) : FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 5)]; - wire [0 * OPERAND_NUM_WORDS-0:0] fsm_shreg_reduce_stop = fsm_shreg[FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 6) : FSM_SHREG_WIDTH - (5 * OPERAND_NUM_WORDS + 6)]; - - wire inc_index_a = |fsm_shreg_inc_index_a; - wire store_word_a = |fsm_shreg_store_word_a; - wire inc_index_b = |fsm_shreg_inc_index_b; - wire clear_mac_ab = |fsm_shreg_inc_index_b; - wire shift_wide_a = |fsm_shreg_inc_index_b; - wire enable_mac_ab = |fsm_shreg_inc_index_b; - wire store_si_msb = |fsm_shreg_store_si_msb; - wire store_si_lsb = fsm_shreg_store_si_lsb; - wire shift_si = |fsm_shreg_shift_si; - wire mask_cw1_sum = fsm_shreg_mask_cw1_sum; - wire store_c_word = |fsm_shreg_store_c_word; - wire reduce_start = fsm_shreg_reduce_start; - wire reduce_stop = fsm_shreg_reduce_stop; - - - // - // FSM Logic - // - wire reduce_done; - - always @(posedge clk or negedge rst_n) - // - if (rst_n == 1'b0) - // - fsm_shreg <= {{FSM_SHREG_WIDTH-1{1'b0}}, 1'b1}; - // - else begin - // - if (rdy) - fsm_shreg <= {ena, {FSM_SHREG_WIDTH-2{1'b0}}, ~ena}; - // - else if (!reduce_stop || reduce_done) - fsm_shreg <= {1'b0, fsm_shreg[FSM_SHREG_WIDTH-1:1]}; - // - end - - - // - // Word Index Increment Logic - // - reg index_b_ff; - - always @(posedge clk) - // - if (inc_index_b) index_b_ff <= ~index_b_ff; - else index_b_ff <= 1'b0; - - always @(posedge clk) - // - if (rdy) begin - // - index_a <= WORD_INDEX_ZERO; - index_b <= WORD_INDEX_LAST; - // - end else begin - // - if (inc_index_a) index_a <= WORD_INDEX_NEXT_OR_ZERO(index_a); - if (inc_index_b && !index_b_ff) index_b <= WORD_INDEX_PREVIOUS_OR_LAST(index_b); - // - end - - - // - // Wide Operand Buffer - // - reg [255:0] buf_a_wide; - - always @(posedge clk) - // - if (store_word_a) - buf_a_wide <= {buf_a_wide[16 +: 256 - 3 * 16], {a_din[15:0], a_din[31:16]}, buf_a_wide[256 - 2 * 16 +: 16]}; - else if (shift_wide_a) - buf_a_wide <= {buf_a_wide[256-(16+1):0], buf_a_wide[256-16+:16]}; - - - // - // Multiplier Array - // - wire mac_inhibit; // control signal to pause all accumulators - - wire [46: 0] mac[0:15]; // outputs of all accumulators - reg [15: 0] mac_clear; // individual per-accumulator clear flag - - assign mac_inhibit = ~enable_mac_ab; - - always @(posedge clk) - // - if (!clear_mac_ab) - mac_clear <= {16{1'b1}}; - else begin - - if (mac_clear == {16{1'b1}}) - mac_clear <= {{14{1'b0}}, 1'b1, {1{1'b0}}}; - else - mac_clear <= (mac_clear[15] == 1'b0) ? {mac_clear[14:0], 1'b0} : {16{1'b1}}; - - - end - - // - // Array of parallel multipliers - // - genvar i; - generate for (i=0; i<16; i=i+1) - begin : gen_mac_array - // - mac16_wrapper mac16_inst - ( - .clk (clk), - .ce (~mac_inhibit), - - .clr (mac_clear[i]), - - .a (buf_a_wide[16*i+:16]), - .b (index_b_ff ? b_din[15:0] : b_din[31:16]), - .s (mac[i]) - ); - // - end - endgenerate - - // - // Intermediate Words - // - reg [47*(2*OPERAND_NUM_WORDS-1)-1:0] si_msb; - reg [47*(2*OPERAND_NUM_WORDS-0)-1:0] si_lsb; - - - wire [47*(2*OPERAND_NUM_WORDS-1)-1:0] si_msb_new; - wire [47*(2*OPERAND_NUM_WORDS-0)-1:0] si_lsb_new; - - generate for (i=0; i<16; i=i+1) - begin : gen_si_lsb_new - assign si_lsb_new[47*i+:47] = mac[15-i]; - end - endgenerate - - generate for (i=1; i<16; i=i+1) - begin : gen_si_msb_new - assign si_msb_new[47*(15-i)+:47] = mac_clear[i] ? mac[i] : si_msb[47*(15-i)+:47]; - end - endgenerate - - always @(posedge clk) begin - // - if (shift_si) begin - si_msb <= {{2*47{1'b0}}, si_msb[15*47-1:2*47]}; - si_lsb <= {si_msb[2*47-1:0], si_lsb[16*47-1:2*47]}; - end else begin - - if (store_si_msb) - si_msb <= si_msb_new; - - if (store_si_lsb) - si_lsb <= si_lsb_new; - end - - end - - - // - // Accumulators - // - wire [46: 0] add47_cw0_s; - wire [46: 0] add47_cw1_s; - - - // - // cw0, b, cw1, b - // - reg [30: 0] si_prev_dly; - reg [15: 0] si_next_dly; - - always @(posedge clk) - // - if (shift_si) - si_prev_dly <= si_lsb[93:63]; - else - si_prev_dly <= {31{1'b0}}; - - always @(posedge clk) - // - si_next_dly <= si_lsb[62:47]; - - wire [46: 0] add47_cw0_a = si_lsb[46:0]; - wire [46: 0] add47_cw0_b = {{16{1'b0}}, si_prev_dly}; - - wire [46: 0] add47_cw1_a = add47_cw0_s; - wire [46: 0] add47_cw1_b = {{15{1'b0}}, si_next_dly, mask_cw1_sum ? {16{1'b0}} : {1'b0, add47_cw1_s[46:32]}}; - - adder47_wrapper add47_cw0_inst - ( - .clk (clk), - .a (add47_cw0_a), - .b (add47_cw0_b), - .s (add47_cw0_s) - ); - - adder47_wrapper add47_cw1_inst - ( - .clk (clk), - .a (add47_cw1_a), - .b (add47_cw1_b), - .s (add47_cw1_s) - ); - - - - // - // Full-Size Product - // - reg [WORD_COUNTER_WIDTH:0] bram_c_addr; - - wire [WORD_COUNTER_WIDTH:0] reduce_c_addr; - wire [ 31:0] reduce_c_word; - - always @(posedge clk) - // - if (store_c_word) - bram_c_addr <= bram_c_addr + 1'b1; - else - bram_c_addr <= {2*WORD_COUNTER_WIDTH{1'b0}}; - - bram_1rw_1ro_readfirst # - ( - .MEM_WIDTH (32), - .MEM_ADDR_BITS (WORD_COUNTER_WIDTH + 1) - ) - bram_c_inst - ( - .clk (clk), - - .a_addr (bram_c_addr), - .a_wr (store_c_word), - .a_in (add47_cw1_s[31:0]), - .a_out (), - - .b_addr (reduce_c_addr), - .b_out (reduce_c_word) - ); - - - // - // Reduction Stage - // - modular_reductor_256 reduce_256_inst - ( - .clk (clk), - .rst_n (rst_n), - - .ena (reduce_start), - .rdy (reduce_done), - - .x_addr (reduce_c_addr), - .n_addr (n_addr), - .p_addr (p_addr), - .p_wren (p_wren), - - .x_din (reduce_c_word), - .n_din (n_din), - .p_dout (p_dout) - ); - - - endmodule - - -//------------------------------------------------------------------------------ -// End-of-File -//------------------------------------------------------------------------------ diff --git a/rtl/modular/modular_reductor_256.v b/rtl/modular/modular_reductor_256.v deleted file mode 100644 index 6f31570..0000000 --- a/rtl/modular/modular_reductor_256.v +++ /dev/null @@ -1,692 +0,0 @@ -//------------------------------------------------------------------------------ -// -// modular_reductor_256.v -// ----------------------------------------------------------------------------- -// Modular reductor. -// -// Authors: Pavel Shatov -// -// Copyright (c) 2015-2016, NORDUnet A/S -// -// 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 NORDUnet 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. -// -//------------------------------------------------------------------------------ - -module modular_reductor_256 - ( - clk, rst_n, - ena, rdy, - x_addr, n_addr, p_addr, p_wren, - x_din, n_din, p_dout - ); - - // - // Constants - // - localparam OPERAND_NUM_WORDS = 8; - localparam WORD_COUNTER_WIDTH = 3; - - - // - // Handy Numbers - // - localparam [WORD_COUNTER_WIDTH:0] WORD_INDEX_ZERO = 0; - localparam [WORD_COUNTER_WIDTH:0] WORD_INDEX_LAST = 2 * OPERAND_NUM_WORDS - 1; - - - // - // Handy Functions - // - function [WORD_COUNTER_WIDTH:0] WORD_INDEX_PREVIOUS_OR_LAST; - input [WORD_COUNTER_WIDTH:0] WORD_INDEX_CURRENT; - begin - WORD_INDEX_PREVIOUS_OR_LAST = (WORD_INDEX_CURRENT > WORD_INDEX_ZERO) ? - WORD_INDEX_CURRENT - 1'b1 : WORD_INDEX_LAST; - end - endfunction - - - // - // Ports - // - input wire clk; // system clock - input wire rst_n; // active-low async reset - - input wire ena; // enable input - output wire rdy; // ready output - - output wire [WORD_COUNTER_WIDTH-0:0] x_addr; // index of current X word - output wire [WORD_COUNTER_WIDTH-1:0] n_addr; // index of current N word - output wire [WORD_COUNTER_WIDTH-1:0] p_addr; // index of current P word - output wire p_wren; // store current P word now - - input wire [ 31:0] x_din; // X - input wire [ 31:0] n_din; // N (must be P-256!) - output wire [ 31:0] p_dout; // P = X mod N - - - // - // Word Indices - // - reg [WORD_COUNTER_WIDTH:0] index_x; - - - /* map registers to output ports */ - assign x_addr = index_x; - - - // - // FSM - // - localparam FSM_SHREG_WIDTH = (2 * OPERAND_NUM_WORDS + 1) + (5 * 2) + 1; - - reg [FSM_SHREG_WIDTH-1:0] fsm_shreg; - - assign rdy = fsm_shreg[0]; - - wire [2 * OPERAND_NUM_WORDS - 1:0] fsm_shreg_inc_index_x = fsm_shreg[FSM_SHREG_WIDTH - 0*OPERAND_NUM_WORDS - 1 -: 2 * OPERAND_NUM_WORDS]; - wire [2 * OPERAND_NUM_WORDS - 1:0] fsm_shreg_store_word_z = fsm_shreg[FSM_SHREG_WIDTH - 0*OPERAND_NUM_WORDS - 2 -: 2 * OPERAND_NUM_WORDS]; - wire [2 * 5 - 1:0] fsm_shreg_reduce_stages = fsm_shreg[ 1 +: 2 * 5]; - - wire [5-1:0] fsm_shreg_reduce_stage_start; - wire [5-1:0] fsm_shreg_reduce_stage_stop; - - genvar s; - generate for (s=0; s<5; s=s+1) - begin : gen_fsm_shreg_reduce_stages - assign fsm_shreg_reduce_stage_start[5 - (s + 1)] = fsm_shreg_reduce_stages[2 * (5 - s) - 1]; - assign fsm_shreg_reduce_stage_stop[5 - (s + 1)] = fsm_shreg_reduce_stages[2 * (5 - s) - 2]; - end - endgenerate - - wire inc_index_x = |fsm_shreg_inc_index_x; - wire store_word_z = |fsm_shreg_store_word_z; - wire reduce_start = |fsm_shreg_reduce_stage_start; - wire reduce_stop = |fsm_shreg_reduce_stage_stop; - wire store_p = fsm_shreg_reduce_stage_stop[0]; - - - wire reduce_adder0_done; - wire reduce_adder1_done; - wire reduce_subtractor_done; - - wire reduce_done_all = reduce_adder0_done & reduce_adder1_done & reduce_subtractor_done; - - always @(posedge clk or negedge rst_n) - // - if (rst_n == 1'b0) - // - fsm_shreg <= {{FSM_SHREG_WIDTH-1{1'b0}}, 1'b1}; - // - else begin - // - if (rdy) - // - fsm_shreg <= {ena, {FSM_SHREG_WIDTH-2{1'b0}}, ~ena}; - // - else if (!reduce_stop || reduce_done_all) - // - fsm_shreg <= {1'b0, fsm_shreg[FSM_SHREG_WIDTH-1:1]}; - // - end - - - // - // Word Index Increment Logic - // - always @(posedge clk) - // - if (rdy) - // - index_x <= WORD_INDEX_LAST; - // - else if (inc_index_x) - // - index_x <= WORD_INDEX_PREVIOUS_OR_LAST(index_x); - - - // - // Look-up Table - // - - // - // Take a look at the corresponding C model for more information - // on how exactly the math behind reduction works. The first step - // is to assemble nine 256-bit values ("z-words") from 32-bit parts - // of the full 512-bit product ("c-word"). The problem with z5 is - // that it contains c13 two times. This implementation scans from - // c15 to c0 and writes current part of c-word into corresponding - // parts of z-words. Since those 32-bit parts are stored in block - // memories, one source word can only be written to one location in - // every z-word at a time. The trick is to delay c13 and then write - // the delayed value at the corresponding location in z5 instead of - // the next c12. "z_save" flag is used to indicate that the current - // word should be delayed and written once again during the next cycle. - // - - reg [9*WORD_COUNTER_WIDTH-1:0] z_addr; // - reg [9 -1:0] z_wren; // - reg [9 -1:0] z_mask; // mask input to store zero word - reg [9 -1:0] z_save; // save previous word once again - - always @(posedge clk) - // - if (inc_index_x) - // - case (index_x) - // - // s9 s8 s7 s6 s5 s4 s3 s2 s1 - // || || || || || || || || || - 4'd00: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd00}; - 4'd01: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd01}; - 4'd02: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd02}; - 4'd03: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd03}; - 4'd04: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd04}; - 4'd05: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd05}; - 4'd06: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd06}; - 4'd07: z_addr <= {3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'dxx, 3'd07}; - 4'd08: z_addr <= {3'd02, 3'd03, 3'd04, 3'd06, 3'd07, 3'd00, 3'd00, 3'd00, 3'dxx}; - 4'd09: z_addr <= {3'd03, 3'd04, 3'd06, 3'd03, 3'd00, 3'd01, 3'd01, 3'd01, 3'dxx}; - 4'd10: z_addr <= {3'd04, 3'd05, 3'd05, 3'd07, 3'd01, 3'd02, 3'd02, 3'd02, 3'dxx}; - 4'd11: z_addr <= {3'd05, 3'd06, 3'd07, 3'd00, 3'd02, 3'd03, 3'd07, 3'd03, 3'dxx}; - 4'd12: z_addr <= {3'd06, 3'd07, 3'd00, 3'd01, 3'd06, 3'd04, 3'd03, 3'd04, 3'dxx}; - 4'd13: z_addr <= {3'd07, 3'd00, 3'd01, 3'd02, 3'd03, 3'd05, 3'd04, 3'd05, 3'dxx}; - 4'd14: z_addr <= {3'd00, 3'd01, 3'd02, 3'd04, 3'd04, 3'd06, 3'd05, 3'd06, 3'dxx}; - 4'd15: z_addr <= {3'd01, 3'd02, 3'd03, 3'd05, 3'd05, 3'd07, 3'd06, 3'd07, 3'dxx}; - // - default: z_addr <= {9*WORD_COUNTER_WIDTH{1'bX}}; - // - endcase - - always @(posedge clk) - // - case (index_x) - // - // 9 8 7 6 5 4 3 2 1 - // | | | | | | | | | - 4'd00: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd01: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd02: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd03: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd04: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd05: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd06: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd07: z_wren <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1}; - 4'd08: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd09: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd10: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd11: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd12: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd13: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd14: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - 4'd15: z_wren <= {1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b1, 1'b0}; - // - default: z_wren <= {9{1'b0}}; - // - endcase - - always @(posedge clk) - // - if (inc_index_x) - // - case (index_x) - // - // 9 8 7 6 5 4 3 2 1 - // | | | | | | | | | - 4'd00: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd01: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd02: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd03: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd04: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd05: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd06: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd07: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd08: z_mask <= {1'b1, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b1, 1'b1, 1'b0}; - 4'd09: z_mask <= {1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b1, 1'b1, 1'b0}; - 4'd10: z_mask <= {1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b1, 1'b1, 1'b0}; - 4'd11: z_mask <= {1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b1, 1'b1, 1'b0, 1'b0}; - 4'd12: z_mask <= {1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0}; - 4'd13: z_mask <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0}; - 4'd14: z_mask <= {1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd15: z_mask <= {1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - // - default: z_mask <= {9{1'bX}}; - // - endcase - - always @(posedge clk) - // - if (inc_index_x) - // - case (index_x) - // - // 9 8 7 6 5 4 3 2 1 - // | | | | | | | | | - 4'd00: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd01: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd02: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd03: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd04: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd05: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd06: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd07: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd08: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd09: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd10: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd11: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd12: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b1, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd13: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd14: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - 4'd15: z_save <= {1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0, 1'b0}; - // - default: z_save <= {9{1'bX}}; - // - endcase - - - // - // Intermediate Numbers - // - reg [WORD_COUNTER_WIDTH-1:0] reduce_z_addr[1:9]; - wire [ 32-1:0] reduce_z_dout[1:9]; - - reg [31: 0] x_din_dly; - always @(posedge clk) - // - x_din_dly <= x_din; - - - genvar z; - generate for (z=1; z<=9; z=z+1) - // - begin : gen_z_bram - // - bram_1rw_1ro_readfirst # (.MEM_WIDTH(32), .MEM_ADDR_BITS(WORD_COUNTER_WIDTH)) - bram_c_inst - ( - .clk (clk), - - .a_addr (z_addr[(z-1) * WORD_COUNTER_WIDTH +: WORD_COUNTER_WIDTH]), - .a_wr (z_wren[z-1] & store_word_z), - .a_in (z_mask[z-1] ? {32{1'b0}} : (z_save[z-1] ? x_din_dly : x_din)), - .a_out (), - - .b_addr (reduce_z_addr[z]), - .b_out (reduce_z_dout[z]) - ); - // - end - // - endgenerate - - - - - wire [ 32-1:0] bram_sum0_wr_din; - wire [WORD_COUNTER_WIDTH-1:0] bram_sum0_wr_addr; - wire bram_sum0_wr_wren; - - wire [ 32-1:0] bram_sum1_wr_din; - wire [WORD_COUNTER_WIDTH-1:0] bram_sum1_wr_addr; - wire bram_sum1_wr_wren; - - wire [ 32-1:0] bram_diff_wr_din; - wire [WORD_COUNTER_WIDTH-1:0] bram_diff_wr_addr; - wire bram_diff_wr_wren; - - wire [ 32-1:0] bram_sum0_rd_dout; - reg [WORD_COUNTER_WIDTH-1:0] bram_sum0_rd_addr; - - wire [ 32-1:0] bram_sum1_rd_dout; - reg [WORD_COUNTER_WIDTH-1:0] bram_sum1_rd_addr; - - wire [ 32-1:0] bram_diff_rd_dout; - reg [WORD_COUNTER_WIDTH-1:0] bram_diff_rd_addr; - - - bram_1rw_1ro_readfirst # (.MEM_WIDTH(32), .MEM_ADDR_BITS(WORD_COUNTER_WIDTH)) - bram_sum0_inst - ( - .clk (clk), - - .a_addr (bram_sum0_wr_addr), - .a_wr (bram_sum0_wr_wren), - .a_in (bram_sum0_wr_din), - .a_out (), - - .b_addr (bram_sum0_rd_addr), - .b_out (bram_sum0_rd_dout) - ); - - bram_1rw_1ro_readfirst # (.MEM_WIDTH(32), .MEM_ADDR_BITS(WORD_COUNTER_WIDTH)) - bram_sum1_inst - ( - .clk (clk), - - .a_addr (bram_sum1_wr_addr), - .a_wr (bram_sum1_wr_wren), - .a_in (bram_sum1_wr_din), - .a_out (), - - .b_addr (bram_sum1_rd_addr), - .b_out (bram_sum1_rd_dout) - ); - - bram_1rw_1ro_readfirst # (.MEM_WIDTH(32), .MEM_ADDR_BITS(WORD_COUNTER_WIDTH)) - bram_diff_inst - ( - .clk (clk), - - .a_addr (bram_diff_wr_addr), - .a_wr (bram_diff_wr_wren), - .a_in (bram_diff_wr_din), - .a_out (), - - .b_addr (bram_diff_rd_addr), - .b_out (bram_diff_rd_dout) - ); - - - wire [WORD_COUNTER_WIDTH-1:0] adder0_ab_addr; - wire [WORD_COUNTER_WIDTH-1:0] adder1_ab_addr; - wire [WORD_COUNTER_WIDTH-1:0] subtractor_ab_addr; - - reg [ 32-1:0] adder0_a_din; - reg [ 32-1:0] adder0_b_din; - - reg [ 32-1:0] adder1_a_din; - reg [ 32-1:0] adder1_b_din; - - reg [ 32-1:0] subtractor_a_din; - reg [ 32-1:0] subtractor_b_din; - - // n_addr - only 1 output, because all modules are in sync - - modular_adder # - ( - .OPERAND_NUM_WORDS (OPERAND_NUM_WORDS), - .WORD_COUNTER_WIDTH (WORD_COUNTER_WIDTH) - ) - adder_inst0 - ( - .clk (clk), - .rst_n (rst_n), - - .ena (reduce_start), - .rdy (reduce_adder0_done), - - .ab_addr (adder0_ab_addr), - .n_addr (), - .s_addr (bram_sum0_wr_addr), - .s_wren (bram_sum0_wr_wren), - - .a_din (adder0_a_din), - .b_din (adder0_b_din), - .n_din (n_din), - .s_dout (bram_sum0_wr_din) - ); - - modular_adder # - ( - .OPERAND_NUM_WORDS (OPERAND_NUM_WORDS), - .WORD_COUNTER_WIDTH (WORD_COUNTER_WIDTH) - ) - adder_inst1 - ( - .clk (clk), - .rst_n (rst_n), - - .ena (reduce_start), - .rdy (reduce_adder1_done), - - .ab_addr (adder1_ab_addr), - .n_addr (), - .s_addr (bram_sum1_wr_addr), - .s_wren (bram_sum1_wr_wren), - - .a_din (adder1_a_din), - .b_din (adder1_b_din), - .n_din (n_din), - .s_dout (bram_sum1_wr_din) - ); - - modular_subtractor # - ( - .OPERAND_NUM_WORDS (OPERAND_NUM_WORDS), - .WORD_COUNTER_WIDTH (WORD_COUNTER_WIDTH) - ) - subtractor_inst - ( - .clk (clk), - .rst_n (rst_n), - - .ena (reduce_start), - .rdy (reduce_subtractor_done), - - .ab_addr (subtractor_ab_addr), - .n_addr (n_addr), - .d_addr (bram_diff_wr_addr), - .d_wren (bram_diff_wr_wren), - - .a_din (subtractor_a_din), - .b_din (subtractor_b_din), - .n_din (n_din), - .d_dout (bram_diff_wr_din) - ); - - - // - // Address (Operand) Selector - // - always @(*) - // - case (fsm_shreg_reduce_stage_stop) - // - 5'b10000: begin - reduce_z_addr[1] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[2] = adder0_ab_addr; - reduce_z_addr[3] = adder1_ab_addr; - reduce_z_addr[4] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[5] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[6] = subtractor_ab_addr; - reduce_z_addr[7] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[8] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[9] = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum0_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum1_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - bram_diff_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - end - // - 5'b01000: begin - reduce_z_addr[1] = adder0_ab_addr; - reduce_z_addr[2] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[3] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[4] = adder1_ab_addr; - reduce_z_addr[5] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[6] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[7] = subtractor_ab_addr; - reduce_z_addr[8] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[9] = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum0_rd_addr = adder0_ab_addr; - bram_sum1_rd_addr = adder1_ab_addr; - bram_diff_rd_addr = subtractor_ab_addr; - end - // - 5'b00100: begin - reduce_z_addr[1] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[2] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[3] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[4] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[5] = adder0_ab_addr; - reduce_z_addr[6] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[7] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[8] = subtractor_ab_addr; - reduce_z_addr[9] = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum0_rd_addr = adder0_ab_addr; - bram_sum1_rd_addr = adder1_ab_addr; - bram_diff_rd_addr = subtractor_ab_addr; - end - // - 5'b00010: begin - reduce_z_addr[1] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[2] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[3] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[4] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[5] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[6] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[7] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[8] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[9] = subtractor_ab_addr; - bram_sum0_rd_addr = adder0_ab_addr; - bram_sum1_rd_addr = adder0_ab_addr; - bram_diff_rd_addr = subtractor_ab_addr; - end - // - 5'b00001: begin - reduce_z_addr[1] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[2] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[3] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[4] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[5] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[6] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[7] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[8] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[9] = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum0_rd_addr = adder0_ab_addr; - bram_sum1_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - bram_diff_rd_addr = adder0_ab_addr; - end - // - default: begin - reduce_z_addr[1] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[2] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[3] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[4] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[5] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[6] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[7] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[8] = {WORD_COUNTER_WIDTH{1'bX}}; - reduce_z_addr[9] = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum0_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - bram_sum1_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - bram_diff_rd_addr = {WORD_COUNTER_WIDTH{1'bX}}; - end - // - endcase - - - // - // adder 0 - // - always @(*) begin - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: adder0_a_din = reduce_z_dout[2]; - 5'b01000: adder0_a_din = bram_sum0_rd_dout; - 5'b00100: adder0_a_din = bram_sum0_rd_dout; - 5'b00010: adder0_a_din = bram_sum0_rd_dout; - 5'b00001: adder0_a_din = bram_sum0_rd_dout; - default: adder0_a_din = {32{1'bX}}; - endcase - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: adder0_b_din = reduce_z_dout[2]; - 5'b01000: adder0_b_din = reduce_z_dout[1]; - 5'b00100: adder0_b_din = reduce_z_dout[5]; - 5'b00010: adder0_b_din = bram_sum1_rd_dout; - 5'b00001: adder0_b_din = bram_diff_rd_dout; - default: adder0_b_din = {32{1'bX}}; - endcase - // - end - - // - // adder 1 - // - always @(*) begin - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: adder1_a_din = reduce_z_dout[3]; - 5'b01000: adder1_a_din = bram_sum1_rd_dout; - 5'b00100: adder1_a_din = bram_sum1_rd_dout; - 5'b00010: adder1_a_din = {32{1'bX}}; - 5'b00001: adder1_a_din = {32{1'bX}}; - default: adder1_a_din = {32{1'bX}}; - endcase - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: adder1_b_din = reduce_z_dout[3]; - 5'b01000: adder1_b_din = reduce_z_dout[4]; - 5'b00100: adder1_b_din = {32{1'b0}}; - 5'b00010: adder1_b_din = {32{1'bX}}; - 5'b00001: adder1_b_din = {32{1'bX}}; - default: adder1_b_din = {32{1'bX}}; - endcase - // - end - - - // - // subtractor - // - always @(*) begin - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: subtractor_a_din = {32{1'b0}}; - 5'b01000: subtractor_a_din = bram_diff_rd_dout; - 5'b00100: subtractor_a_din = bram_diff_rd_dout; - 5'b00010: subtractor_a_din = bram_diff_rd_dout; - 5'b00001: subtractor_a_din = {32{1'bX}}; - default: subtractor_a_din = {32{1'bX}}; - endcase - // - case (fsm_shreg_reduce_stage_stop) - 5'b10000: subtractor_b_din = reduce_z_dout[6]; - 5'b01000: subtractor_b_din = reduce_z_dout[7]; - 5'b00100: subtractor_b_din = reduce_z_dout[8]; - 5'b00010: subtractor_b_din = reduce_z_dout[9]; - 5'b00001: subtractor_b_din = {32{1'bX}}; - default: subtractor_b_din = {32{1'bX}}; - endcase - // - end - - - // - // Address Mapping - // - assign p_addr = bram_sum0_wr_addr; - assign p_wren = bram_sum0_wr_wren & store_p; - assign p_dout = bram_sum0_wr_din; - - -endmodule - - -//------------------------------------------------------------------------------ -// End-of-File -//------------------------------------------------------------------------------ |