| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Wishbone Interconnect //// |
| //// //// |
| //// This file is part of the YIFive cores project //// |
| //// http://www.opencores.org/cores/yifive/ //// |
| //// //// |
| //// Description //// |
| //// 1. 3 masters and 3 slaves share bus Wishbone connection //// |
| //// 2. This block implement simple round robine request //// |
| //// //// |
| //// To Do: //// |
| //// nothing //// |
| //// //// |
| //// Author(s): //// |
| //// - Dinesh Annayya, dinesha@opencores.org //// |
| //// //// |
| //// Revision : //// |
| //// 0.1 - 12th June 2021, Dinesh A //// |
| //// 0.2 - 17th June 2021, Dinesh A //// |
| //// Stagging FF added at Slave Interface to break //// |
| //// path //// |
| //// 0.3 - 21th June 2021, Dinesh A //// |
| //// slave port 3 added for uart //// |
| //// //// |
| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Copyright (C) 2000 Authors and OPENCORES.ORG //// |
| //// //// |
| //// This source file may be used and distributed without //// |
| //// restriction provided that this copyright statement is not //// |
| //// removed from the file and that any derivative work contains //// |
| //// the original copyright notice and the associated disclaimer. //// |
| //// //// |
| //// This source file is free software; you can redistribute it //// |
| //// and/or modify it under the terms of the GNU Lesser General //// |
| //// Public License as published by the Free Software Foundation; //// |
| //// either version 2.1 of the License, or (at your option) any //// |
| //// later version. //// |
| //// //// |
| //// This source 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 Lesser General Public License for more //// |
| //// details. //// |
| //// //// |
| //// You should have received a copy of the GNU Lesser General //// |
| //// Public License along with this source; if not, download it //// |
| //// from http://www.opencores.org/lgpl.shtml //// |
| //// //// |
| ////////////////////////////////////////////////////////////////////// |
| |
| |
| |
| module wb_interconnect( |
| input logic clk_i, |
| input logic rst_n, |
| |
| // Master 0 Interface |
| input logic [31:0] m0_wbd_dat_i, |
| input logic [31:0] m0_wbd_adr_i, |
| input logic [3:0] m0_wbd_sel_i, |
| input logic m0_wbd_we_i, |
| input logic m0_wbd_cyc_i, |
| input logic m0_wbd_stb_i, |
| output logic [31:0] m0_wbd_dat_o, |
| output logic m0_wbd_ack_o, |
| output logic m0_wbd_err_o, |
| |
| // Master 1 Interface |
| input logic [31:0] m1_wbd_dat_i, |
| input logic [31:0] m1_wbd_adr_i, |
| input logic [3:0] m1_wbd_sel_i, |
| input logic m1_wbd_we_i, |
| input logic m1_wbd_cyc_i, |
| input logic m1_wbd_stb_i, |
| output logic [31:0] m1_wbd_dat_o, |
| output logic m1_wbd_ack_o, |
| output logic m1_wbd_err_o, |
| |
| // Master 2 Interface |
| input logic [31:0] m2_wbd_dat_i, |
| input logic [31:0] m2_wbd_adr_i, |
| input logic [3:0] m2_wbd_sel_i, |
| input logic m2_wbd_we_i, |
| input logic m2_wbd_cyc_i, |
| input logic m2_wbd_stb_i, |
| output logic [31:0] m2_wbd_dat_o, |
| output logic m2_wbd_ack_o, |
| output logic m2_wbd_err_o, |
| |
| |
| // Slave 0 Interface |
| input logic [31:0] s0_wbd_dat_i, |
| input logic s0_wbd_ack_i, |
| input logic s0_wbd_err_i, |
| output logic [31:0] s0_wbd_dat_o, |
| output logic [31:0] s0_wbd_adr_o, |
| output logic [3:0] s0_wbd_sel_o, |
| output logic s0_wbd_we_o, |
| output logic s0_wbd_cyc_o, |
| output logic s0_wbd_stb_o, |
| |
| // Slave 1 Interface |
| input logic [31:0] s1_wbd_dat_i, |
| input logic s1_wbd_ack_i, |
| input logic s1_wbd_err_i, |
| output logic [31:0] s1_wbd_dat_o, |
| output logic [31:0] s1_wbd_adr_o, |
| output logic [3:0] s1_wbd_sel_o, |
| output logic s1_wbd_we_o, |
| output logic s1_wbd_cyc_o, |
| output logic s1_wbd_stb_o, |
| |
| // Slave 2 Interface |
| input logic [31:0] s2_wbd_dat_i, |
| input logic s2_wbd_ack_i, |
| input logic s2_wbd_err_i, |
| output logic [31:0] s2_wbd_dat_o, |
| output logic [7:0] s2_wbd_adr_o, // glbl reg need only 8 bits |
| output logic [3:0] s2_wbd_sel_o, |
| output logic s2_wbd_we_o, |
| output logic s2_wbd_cyc_o, |
| output logic s2_wbd_stb_o, |
| |
| // Slave 3 Interface |
| // Uart is 8bit interface |
| input logic [7:0] s3_wbd_dat_i, |
| input logic s3_wbd_ack_i, |
| input logic s3_wbd_err_i, |
| output logic [7:0] s3_wbd_dat_o, |
| output logic [7:0] s3_wbd_adr_o, |
| output logic s3_wbd_sel_o, |
| output logic s3_wbd_we_o, |
| output logic s3_wbd_cyc_o, |
| output logic s3_wbd_stb_o |
| ); |
| |
| //////////////////////////////////////////////////////////////////// |
| // |
| // Type define |
| // |
| |
| |
| // WishBone Wr Interface |
| typedef struct packed { |
| logic [31:0] wbd_dat; |
| logic [31:0] wbd_adr; |
| logic [3:0] wbd_sel; |
| logic wbd_we; |
| logic wbd_cyc; |
| logic wbd_stb; |
| logic [3:0] wbd_tid; // target id |
| } type_wb_wr_intf; |
| |
| // WishBone Rd Interface |
| typedef struct packed { |
| logic [31:0] wbd_dat; |
| logic wbd_ack; |
| logic wbd_err; |
| } type_wb_rd_intf; |
| |
| |
| // Master Write Interface |
| type_wb_wr_intf m0_wb_wr; |
| type_wb_wr_intf m1_wb_wr; |
| type_wb_wr_intf m2_wb_wr; |
| |
| // Master Read Interface |
| type_wb_rd_intf m0_wb_rd; |
| type_wb_rd_intf m1_wb_rd; |
| type_wb_rd_intf m2_wb_rd; |
| |
| // Slave Write Interface |
| type_wb_wr_intf s0_wb_wr; |
| type_wb_wr_intf s1_wb_wr; |
| type_wb_wr_intf s2_wb_wr; |
| type_wb_wr_intf s3_wb_wr; |
| |
| // Slave Read Interface |
| type_wb_rd_intf s0_wb_rd; |
| type_wb_rd_intf s1_wb_rd; |
| type_wb_rd_intf s2_wb_rd; |
| type_wb_rd_intf s3_wb_rd; |
| |
| |
| type_wb_wr_intf m_bus_wr; // Multiplexed Master I/F |
| type_wb_rd_intf m_bus_rd; // Multiplexed Slave I/F |
| |
| type_wb_wr_intf s_bus_wr; // Multiplexed Master I/F |
| type_wb_rd_intf s_bus_rd; // Multiplexed Slave I/F |
| //------------------------------ |
| // RISC Data Memory Map |
| // 0x0000_0000 to 0x0FFF_FFFF - SPI FLASH MEMORY |
| // 0x1000_0000 to 0x1000_00FF - SPI REGISTER |
| // 0x2000_0000 to 0x2FFF_FFFF - SDRAM |
| // 0x3000_0000 to 0x3000_00FF - GLOBAL REGISTER |
| // 0x3000_0000 to 0x3001_00FF - UART Register |
| //----------------------------- |
| // |
| wire [3:0] m0_wbd_tid_i = (m0_wbd_adr_i[31:28] == 4'b0000 ) ? 4'b0000 : |
| (m0_wbd_adr_i[31:28] == 4'b0001 ) ? 4'b0000 : |
| (m0_wbd_adr_i[31:28] == 4'b0010 ) ? 4'b0001 : |
| (m0_wbd_adr_i[31:16] == 16'h3000 ) ? 4'b0010 : |
| (m0_wbd_adr_i[31:16] == 16'h3001 ) ? 4'b0011 : 4'b0000; |
| |
| wire [3:0] m1_wbd_tid_i = (m1_wbd_adr_i[31:28] == 4'b0000 ) ? 4'b0000 : |
| (m1_wbd_adr_i[31:28] == 4'b0001 ) ? 4'b0000 : |
| (m1_wbd_adr_i[31:28] == 4'b0010 ) ? 4'b0001 : |
| (m1_wbd_adr_i[31:16] == 16'h3000 ) ? 4'b0010 : |
| (m1_wbd_adr_i[31:16] == 16'h3001 ) ? 4'b0011 : 4'b0000; |
| |
| |
| //------------------------------------------------------------------- |
| // EXTERNAL MEMORY MAP |
| // 0x3000_0000 to 0x3000_00FF - GLOBAL REGISTER |
| // 0x3000_0000 to 0x3001_00FF - UART Register |
| // 0x4000_0000 to 0x4FFF_FFFF - SPI FLASH MEMORY |
| // 0x5000_0000 to 0x5000_00FF - SPI REGISTER |
| // 0x6000_0000 to 0x6FFF_FFFF - SDRAM |
| // |
| wire [3:0] m2_wbd_tid_i = (m2_wbd_adr_i[31:28] == 4'b0100 ) ? 4'b0000 : |
| (m2_wbd_adr_i[31:28] == 4'b0101 ) ? 4'b0000 : |
| (m2_wbd_adr_i[31:28] == 4'b0110 ) ? 4'b0001 : |
| (m2_wbd_adr_i[31:16] == 16'h3000 ) ? 4'b0010 : |
| (m2_wbd_adr_i[31:16] == 16'h3001 ) ? 4'b0011 : 4'b0000; |
| |
| //---------------------------------------- |
| // Master Mapping |
| // ------------------------------------- |
| assign m0_wb_wr.wbd_dat = m0_wbd_dat_i; |
| assign m0_wb_wr.wbd_adr = m0_wbd_adr_i; |
| assign m0_wb_wr.wbd_sel = m0_wbd_sel_i; |
| assign m0_wb_wr.wbd_we = m0_wbd_we_i; |
| assign m0_wb_wr.wbd_cyc = m0_wbd_cyc_i; |
| assign m0_wb_wr.wbd_stb = m0_wbd_stb_i; |
| assign m0_wb_wr.wbd_tid = m0_wbd_tid_i; |
| |
| assign m1_wb_wr.wbd_dat = m1_wbd_dat_i; |
| assign m1_wb_wr.wbd_adr = m1_wbd_adr_i; |
| assign m1_wb_wr.wbd_sel = m1_wbd_sel_i; |
| assign m1_wb_wr.wbd_we = m1_wbd_we_i; |
| assign m1_wb_wr.wbd_cyc = m1_wbd_cyc_i; |
| assign m1_wb_wr.wbd_stb = m1_wbd_stb_i; |
| assign m1_wb_wr.wbd_tid = m1_wbd_tid_i; |
| |
| assign m2_wb_wr.wbd_dat = m2_wbd_dat_i; |
| assign m2_wb_wr.wbd_adr = m2_wbd_adr_i; |
| assign m2_wb_wr.wbd_sel = m2_wbd_sel_i; |
| assign m2_wb_wr.wbd_we = m2_wbd_we_i; |
| assign m2_wb_wr.wbd_cyc = m2_wbd_cyc_i; |
| assign m2_wb_wr.wbd_stb = m2_wbd_stb_i; |
| assign m2_wb_wr.wbd_tid = m2_wbd_tid_i; |
| |
| assign m0_wbd_dat_o = m0_wb_rd.wbd_dat; |
| assign m0_wbd_ack_o = m0_wb_rd.wbd_ack; |
| assign m0_wbd_err_o = m0_wb_rd.wbd_err; |
| |
| assign m1_wbd_dat_o = m1_wb_rd.wbd_dat; |
| assign m1_wbd_ack_o = m1_wb_rd.wbd_ack; |
| assign m1_wbd_err_o = m1_wb_rd.wbd_err; |
| |
| assign m2_wbd_dat_o = m2_wb_rd.wbd_dat; |
| assign m2_wbd_ack_o = m2_wb_rd.wbd_ack; |
| assign m2_wbd_err_o = m2_wb_rd.wbd_err; |
| |
| //---------------------------------------- |
| // Slave Mapping |
| // ------------------------------------- |
| // Masked Now and added stagging FF now |
| assign s0_wbd_dat_o = s0_wb_wr.wbd_dat ; |
| assign s0_wbd_adr_o = s0_wb_wr.wbd_adr ; |
| assign s0_wbd_sel_o = s0_wb_wr.wbd_sel ; |
| assign s0_wbd_we_o = s0_wb_wr.wbd_we ; |
| assign s0_wbd_cyc_o = s0_wb_wr.wbd_cyc ; |
| assign s0_wbd_stb_o = s0_wb_wr.wbd_stb ; |
| |
| assign s1_wbd_dat_o = s1_wb_wr.wbd_dat ; |
| assign s1_wbd_adr_o = s1_wb_wr.wbd_adr ; |
| assign s1_wbd_sel_o = s1_wb_wr.wbd_sel ; |
| assign s1_wbd_we_o = s1_wb_wr.wbd_we ; |
| assign s1_wbd_cyc_o = s1_wb_wr.wbd_cyc ; |
| assign s1_wbd_stb_o = s1_wb_wr.wbd_stb ; |
| |
| assign s2_wbd_dat_o = s2_wb_wr.wbd_dat ; |
| assign s2_wbd_adr_o = s2_wb_wr.wbd_adr[7:0] ; // Global Reg Need 8 bit |
| assign s2_wbd_sel_o = s2_wb_wr.wbd_sel ; |
| assign s2_wbd_we_o = s2_wb_wr.wbd_we ; |
| assign s2_wbd_cyc_o = s2_wb_wr.wbd_cyc ; |
| assign s2_wbd_stb_o = s2_wb_wr.wbd_stb ; |
| |
| assign s3_wbd_dat_o = s3_wb_wr.wbd_dat[7:0] ; |
| assign s3_wbd_adr_o = s3_wb_wr.wbd_adr[7:0] ; // Global Reg Need 8 bit |
| assign s3_wbd_sel_o = s3_wb_wr.wbd_sel[0] ; |
| assign s3_wbd_we_o = s3_wb_wr.wbd_we ; |
| assign s3_wbd_cyc_o = s3_wb_wr.wbd_cyc ; |
| assign s3_wbd_stb_o = s3_wb_wr.wbd_stb ; |
| |
| assign s0_wb_rd.wbd_dat = s0_wbd_dat_i ; |
| assign s0_wb_rd.wbd_ack = s0_wbd_ack_i ; |
| assign s0_wb_rd.wbd_err = s0_wbd_err_i ; |
| |
| assign s1_wb_rd.wbd_dat = s1_wbd_dat_i ; |
| assign s1_wb_rd.wbd_ack = s1_wbd_ack_i ; |
| assign s1_wb_rd.wbd_err = s1_wbd_err_i ; |
| |
| assign s2_wb_rd.wbd_dat = s2_wbd_dat_i ; |
| assign s2_wb_rd.wbd_ack = s2_wbd_ack_i ; |
| assign s2_wb_rd.wbd_err = s2_wbd_err_i ; |
| |
| assign s3_wb_rd.wbd_dat = {24'h0,s3_wbd_dat_i} ; |
| assign s3_wb_rd.wbd_ack = s3_wbd_ack_i ; |
| assign s3_wb_rd.wbd_err = s3_wbd_err_i ; |
| |
| // |
| // arbitor |
| // |
| logic [1:0] gnt; |
| |
| wb_arb u_wb_arb( |
| .clk(clk_i), |
| .rstn(rst_n), |
| .req({ m2_wbd_stb_i & !m2_wbd_ack_o, |
| m1_wbd_stb_i & !m1_wbd_ack_o, |
| m0_wbd_stb_i & !m0_wbd_ack_o}), |
| .gnt(gnt) |
| ); |
| |
| |
| // Generate Multiplexed Master Interface based on grant |
| always_comb begin |
| case(gnt) |
| 3'h0: m_bus_wr = m0_wb_wr; |
| 3'h1: m_bus_wr = m1_wb_wr; |
| 3'h2: m_bus_wr = m2_wb_wr; |
| default: m_bus_wr = m0_wb_wr; |
| endcase |
| end |
| |
| |
| // Generate Multiplexed Slave Interface based on target Id |
| wire [3:0] s_wbd_tid = s_bus_wr.wbd_tid; // to fix iverilog warning |
| always_comb begin |
| case(s_wbd_tid) |
| 3'h0: s_bus_rd = s0_wb_rd; |
| 3'h1: s_bus_rd = s1_wb_rd; |
| 3'h2: s_bus_rd = s2_wb_rd; |
| 3'h3: s_bus_rd = s3_wb_rd; |
| default: s_bus_rd = s0_wb_rd; |
| endcase |
| end |
| |
| |
| // Connect Master => Slave |
| assign s0_wb_wr = (s_wbd_tid == 2'b00) ? s_bus_wr : 'h0; |
| assign s1_wb_wr = (s_wbd_tid == 2'b01) ? s_bus_wr : 'h0; |
| assign s2_wb_wr = (s_wbd_tid == 2'b10) ? s_bus_wr : 'h0; |
| assign s3_wb_wr = (s_wbd_tid == 2'b11) ? s_bus_wr : 'h0; |
| |
| // Connect Slave to Master |
| assign m0_wb_rd = (gnt == 2'b00) ? m_bus_rd : 'h0; |
| assign m1_wb_rd = (gnt == 2'b01) ? m_bus_rd : 'h0; |
| assign m2_wb_rd = (gnt == 2'b10) ? m_bus_rd : 'h0; |
| |
| |
| // Stagging FF to break write and read timing path |
| wb_stagging u_m_wb_stage( |
| .clk_i (clk_i ), |
| .rst_n (rst_n ), |
| // WishBone Input master I/P |
| .m_wbd_dat_i (m_bus_wr.wbd_dat ), |
| .m_wbd_adr_i (m_bus_wr.wbd_adr ), |
| .m_wbd_sel_i (m_bus_wr.wbd_sel ), |
| .m_wbd_we_i (m_bus_wr.wbd_we ), |
| .m_wbd_cyc_i (m_bus_wr.wbd_cyc ), |
| .m_wbd_stb_i (m_bus_wr.wbd_stb ), |
| .m_wbd_tid_i (m_bus_wr.wbd_tid ), |
| .m_wbd_dat_o (m_bus_rd.wbd_dat ), |
| .m_wbd_ack_o (m_bus_rd.wbd_ack ), |
| .m_wbd_err_o (m_bus_rd.wbd_err ), |
| |
| // Slave Interface |
| .s_wbd_dat_i (s_bus_rd.wbd_dat ), |
| .s_wbd_ack_i (s_bus_rd.wbd_ack ), |
| .s_wbd_err_i (s_bus_rd.wbd_err ), |
| .s_wbd_dat_o (s_bus_wr.wbd_dat ), |
| .s_wbd_adr_o (s_bus_wr.wbd_adr ), |
| .s_wbd_sel_o (s_bus_wr.wbd_sel ), |
| .s_wbd_we_o (s_bus_wr.wbd_we ), |
| .s_wbd_cyc_o (s_bus_wr.wbd_cyc ), |
| .s_wbd_stb_o (s_bus_wr.wbd_stb ), |
| .s_wbd_tid_o (s_bus_wr.wbd_tid ) |
| |
| ); |
| |
| |
| endmodule |
| |
