| ////////////////////////////////////////////////////////////////////////////// |
| // SPDX-FileCopyrightText: 2021 , Dinesh Annayya |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // SPDX-License-Identifier: Apache-2.0 |
| // SPDX-FileContributor: Created by Dinesh Annayya <dinesha@opencores.org> |
| // |
| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// Wishbone host Interface //// |
| //// //// |
| //// This file is part of the YIFive cores project //// |
| //// https://github.com/dineshannayya/yifive_r0.git //// |
| //// http://www.opencores.org/cores/yifive/ //// |
| //// //// |
| //// Description //// |
| //// This block does async Wishbone from one clock to other //// |
| //// clock domain //// |
| //// //// |
| //// To Do: //// |
| //// nothing //// |
| //// //// |
| //// Author(s): //// |
| //// - Dinesh Annayya, dinesha@opencores.org //// |
| //// //// |
| //// Revision : //// |
| //// 0.1 - 25th Feb 2021, Dinesh A //// |
| //// initial version //// |
| ////////////////////////////////////////////////////////////////////// |
| //// //// |
| //// 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_host ( |
| |
| `ifdef USE_POWER_PINS |
| inout vccd1, // User area 1 1.8V supply |
| inout vssd1, // User area 1 digital ground |
| `endif |
| input logic user_clock1 , |
| input logic user_clock2 , |
| |
| output logic sdram_clk , |
| output logic cpu_clk , |
| output logic rtc_clk , |
| // Global Reset control |
| output logic wbd_int_rst_n , |
| output logic cpu_rst_n , |
| output logic spi_rst_n , |
| output logic sdram_rst_n , |
| output logic uart_rst_n , |
| output logic i2cm_rst_n , |
| output logic uart_i2c_sel , |
| |
| // Master Port |
| input logic wbm_rst_i , // Regular Reset signal |
| input logic wbm_clk_i , // System clock |
| input logic wbm_cyc_i , // strobe/request |
| input logic wbm_stb_i , // strobe/request |
| input logic [31:0] wbm_adr_i , // address |
| input logic wbm_we_i , // write |
| input logic [31:0] wbm_dat_i , // data output |
| input logic [3:0] wbm_sel_i , // byte enable |
| output logic [31:0] wbm_dat_o , // data input |
| output logic wbm_ack_o , // acknowlegement |
| output logic wbm_err_o , // error |
| |
| // Slave Port |
| output logic wbs_clk_out , // System clock |
| input logic wbs_clk_i , // System clock |
| output logic wbs_cyc_o , // strobe/request |
| output logic wbs_stb_o , // strobe/request |
| output logic [31:0] wbs_adr_o , // address |
| output logic wbs_we_o , // write |
| output logic [31:0] wbs_dat_o , // data output |
| output logic [3:0] wbs_sel_o , // byte enable |
| input logic [31:0] wbs_dat_i , // data input |
| input logic wbs_ack_i , // acknowlegement |
| input logic wbs_err_i , // error |
| |
| output logic [31:0] cfg_clk_ctrl1 , |
| output logic [31:0] cfg_clk_ctrl2 |
| |
| ); |
| |
| |
| //-------------------------------- |
| // local dec |
| // |
| //-------------------------------- |
| logic wbm_rst_n; |
| logic wbs_rst_n; |
| logic [31:0] wbm_dat_int; // data input |
| logic wbm_ack_int; // acknowlegement |
| logic wbm_err_int; // error |
| |
| logic reg_sel ; |
| logic [1:0] sw_addr ; |
| logic sw_rd_en ; |
| logic sw_wr_en ; |
| logic [31:0] reg_rdata ; |
| logic [31:0] reg_out ; |
| logic reg_ack ; |
| logic [7:0] config_reg ; |
| logic [31:0] clk_ctrl1 ; |
| logic [31:0] clk_ctrl2 ; |
| logic sw_wr_en_0; |
| logic sw_wr_en_1; |
| logic sw_wr_en_2; |
| logic sw_wr_en_3; |
| logic [7:0] cfg_bank_sel; |
| logic [31:0] wbm_adr_int; |
| logic wbm_stb_int; |
| logic [23:0] reg_0; // Software_Reg_0 |
| |
| logic [2:0] cfg_wb_clk_ctrl; |
| logic [2:0] cfg_sdram_clk_ctrl; |
| logic [2:0] cfg_cpu_clk_ctrl; |
| logic [2:0] cfg_rtc_clk_ctrl; |
| logic [7:0] cfg_glb_ctrl; |
| |
| |
| assign wbm_rst_n = !wbm_rst_i; |
| assign wbs_rst_n = !wbm_rst_i; |
| |
| sky130_fd_sc_hd__bufbuf_16 u_buf_wb_rst (.A(cfg_glb_ctrl[0]),.X(wbd_int_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_cpu_rst (.A(cfg_glb_ctrl[1]),.X(cpu_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_spi_rst (.A(cfg_glb_ctrl[2]),.X(spi_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_sdram_rst (.A(cfg_glb_ctrl[3]),.X(sdram_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_uart_rst (.A(cfg_glb_ctrl[4]),.X(uart_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_i2cm_rst (.A(cfg_glb_ctrl[5]),.X(i2cm_rst_n)); |
| sky130_fd_sc_hd__bufbuf_16 u_buf_uart_i2c_sel (.A(cfg_glb_ctrl[7]),.X(uart_i2c_sel)); |
| |
| // To reduce the load/Timing Wishbone I/F, Strobe is register to create |
| // multi-cycle |
| logic wb_req; |
| always_ff @(negedge wbm_rst_n or posedge wbm_clk_i) begin |
| if ( wbm_rst_n == 1'b0 ) begin |
| wb_req <= '0; |
| end else begin |
| wb_req <= wbm_stb_i && (wbm_ack_o == 0) ; |
| end |
| end |
| |
| assign wbm_dat_o = (reg_sel) ? reg_rdata : wbm_dat_int; // data input |
| assign wbm_ack_o = (reg_sel) ? reg_ack : wbm_ack_int; // acknowlegement |
| assign wbm_err_o = (reg_sel) ? 1'b0 : wbm_err_int; // error |
| |
| //----------------------------------------------------------------------- |
| // Local register decide based on address[31] == 1 |
| // |
| // Locally there register are define to control the reset and clock for user |
| // area |
| //----------------------------------------------------------------------- |
| // caravel user space is 0x3000_0000 to 0x30FF_FFFF |
| // So we have allocated |
| // 0x3080_0000 - 0x3080_00FF - Assigned to WB Host Address Space |
| // Since We need more than 16MB Address space to access SDRAM/SPI we have |
| // added indirect MSB 8 bit address select option |
| // So Address will be {Bank_Sel[7:0], wbm_adr_i[23:0} |
| // --------------------------------------------------------------------- |
| assign reg_sel = wb_req & (wbm_adr_i[23] == 1'b1); |
| |
| assign sw_addr = wbm_adr_i [3:2]; |
| assign sw_rd_en = reg_sel & !wbm_we_i; |
| assign sw_wr_en = reg_sel & wbm_we_i; |
| |
| assign sw_wr_en_0 = sw_wr_en && (sw_addr==0); |
| assign sw_wr_en_1 = sw_wr_en && (sw_addr==1); |
| assign sw_wr_en_2 = sw_wr_en && (sw_addr==2); |
| assign sw_wr_en_3 = sw_wr_en && (sw_addr==3); |
| |
| always @ (posedge wbm_clk_i or negedge wbm_rst_n) |
| begin : preg_out_Seq |
| if (wbm_rst_n == 1'b0) |
| begin |
| reg_rdata <= 'h0; |
| reg_ack <= 1'b0; |
| end |
| else if (sw_rd_en && !reg_ack) |
| begin |
| reg_rdata <= reg_out ; |
| reg_ack <= 1'b1; |
| end |
| else if (sw_wr_en && !reg_ack) |
| reg_ack <= 1'b1; |
| else |
| begin |
| reg_ack <= 1'b0; |
| end |
| end |
| |
| |
| //------------------------------------- |
| // Global + Clock Control |
| // ------------------------------------- |
| assign cfg_glb_ctrl = reg_0[7:0]; |
| assign cfg_wb_clk_ctrl = reg_0[10:8]; |
| assign cfg_sdram_clk_ctrl = reg_0[15:12]; |
| assign cfg_cpu_clk_ctrl = reg_0[19:16]; |
| assign cfg_rtc_clk_ctrl = reg_0[23:20]; |
| |
| always @( *) |
| begin |
| reg_out [31:0] = 8'd0; |
| |
| case (sw_addr [1:0]) |
| 2'b00 : reg_out [31:0] = {8'h0, reg_0[23:0]}; |
| 2'b01 : reg_out [31:0] = {24'h0,cfg_bank_sel [7:0]}; |
| 2'b10 : reg_out [31:0] = cfg_clk_ctrl1 [31:0]; |
| 2'b11 : reg_out [31:0] = cfg_clk_ctrl2 [31:0]; |
| default : reg_out [31:0] = 'h0; |
| endcase |
| end |
| |
| |
| |
| generic_register #(24,0 ) u_glb_ctrl ( |
| .we ({24{sw_wr_en_0}} ), |
| .data_in (wbm_dat_i[23:0] ), |
| .reset_n (wbm_rst_n ), |
| .clk (wbm_clk_i ), |
| |
| //List of Outs |
| .data_out (reg_0[23:0]) |
| ); |
| |
| generic_register #(8,8'h30 ) u_bank_sel ( |
| .we ({8{sw_wr_en_1}} ), |
| .data_in (wbm_dat_i[7:0] ), |
| .reset_n (wbm_rst_n ), |
| .clk (wbm_clk_i ), |
| |
| //List of Outs |
| .data_out (cfg_bank_sel[7:0] ) |
| ); |
| |
| |
| generic_register #(32,0 ) u_clk_ctrl1 ( |
| .we ({32{sw_wr_en_2}} ), |
| .data_in (wbm_dat_i[31:0] ), |
| .reset_n (wbm_rst_n ), |
| .clk (wbm_clk_i ), |
| |
| //List of Outs |
| .data_out (cfg_clk_ctrl1[31:0]) |
| ); |
| |
| generic_register #(32,0 ) u_clk_ctrl2 ( |
| .we ({32{sw_wr_en_3}} ), |
| .data_in (wbm_dat_i[31:0] ), |
| .reset_n (wbm_rst_n ), |
| .clk (wbm_clk_i ), |
| |
| //List of Outs |
| .data_out (cfg_clk_ctrl2[31:0]) |
| ); |
| |
| |
| assign wbm_stb_int = wb_req & !reg_sel; |
| |
| // Since design need more than 16MB address space, we have implemented |
| // indirect access |
| assign wbm_adr_int = {cfg_bank_sel[7:0],wbm_adr_i[23:0]}; |
| |
| async_wb u_async_wb( |
| // Master Port |
| .wbm_rst_n (wbm_rst_n ), |
| .wbm_clk_i (wbm_clk_i ), |
| .wbm_cyc_i (wbm_cyc_i ), |
| .wbm_stb_i (wbm_stb_int ), |
| .wbm_adr_i (wbm_adr_int ), |
| .wbm_we_i (wbm_we_i ), |
| .wbm_dat_i (wbm_dat_i ), |
| .wbm_sel_i (wbm_sel_i ), |
| .wbm_dat_o (wbm_dat_int ), |
| .wbm_ack_o (wbm_ack_int ), |
| .wbm_err_o (wbm_err_int ), |
| |
| // Slave Port |
| .wbs_rst_n (wbs_rst_n ), |
| .wbs_clk_i (wbs_clk_i ), |
| .wbs_cyc_o (wbs_cyc_o ), |
| .wbs_stb_o (wbs_stb_o ), |
| .wbs_adr_o (wbs_adr_o ), |
| .wbs_we_o (wbs_we_o ), |
| .wbs_dat_o (wbs_dat_o ), |
| .wbs_sel_o (wbs_sel_o ), |
| .wbs_dat_i (wbs_dat_i ), |
| .wbs_ack_i (wbs_ack_i ), |
| .wbs_err_i (wbs_err_i ) |
| |
| ); |
| |
| |
| //---------------------------------- |
| // Generate Internal WishBone Clock |
| //---------------------------------- |
| logic wb_clk_div; |
| logic cfg_wb_clk_div; |
| logic [1:0] cfg_wb_clk_ratio; |
| |
| assign cfg_wb_clk_ratio = cfg_wb_clk_ctrl[1:0]; |
| assign cfg_wb_clk_div = cfg_wb_clk_ctrl[2]; |
| |
| |
| assign wbs_clk_out = (cfg_wb_clk_div) ? wb_clk_div : wbm_clk_i; |
| |
| |
| clk_ctl #(1) u_wbclk ( |
| // Outputs |
| .clk_o (wb_clk_div ), |
| // Inputs |
| .mclk (wbm_clk_i ), |
| .reset_n (wbm_rst_n ), |
| .clk_div_ratio (cfg_wb_clk_ratio ) |
| ); |
| |
| //---------------------------------- |
| // Generate SDRAM Clock Generation |
| //---------------------------------- |
| wire sdram_clk_div; |
| wire sdram_ref_clk; |
| wire sdram_clk_int; |
| |
| wire cfg_sdram_clk_src_sel = cfg_sdram_clk_ctrl[0]; |
| wire cfg_sdram_clk_div = cfg_sdram_clk_ctrl[1]; |
| wire [1:0] cfg_sdram_clk_ratio = cfg_sdram_clk_ctrl[3:2]; |
| assign sdram_ref_clk = (cfg_sdram_clk_src_sel) ? user_clock2 :user_clock1; |
| assign sdram_clk_int = (cfg_sdram_clk_div) ? sdram_clk_div : sdram_ref_clk; |
| |
| sky130_fd_sc_hd__clkbuf_16 u_clkbuf_sdram (.A (sdram_clk_int), . X(sdram_clk)); |
| |
| clk_ctl #(1) u_sdramclk ( |
| // Outputs |
| .clk_o (sdram_clk_div ), |
| // Inputs |
| .mclk (sdram_ref_clk ), |
| .reset_n (reset_n ), |
| .clk_div_ratio (cfg_sdram_clk_ratio) |
| ); |
| |
| |
| //---------------------------------- |
| // Generate CORE Clock Generation |
| //---------------------------------- |
| wire cpu_clk_div; |
| wire cpu_ref_clk; |
| wire cpu_clk_int; |
| |
| wire cfg_cpu_clk_src_sel = cfg_cpu_clk_ctrl[0]; |
| wire cfg_cpu_clk_div = cfg_cpu_clk_ctrl[1]; |
| wire [1:0] cfg_cpu_clk_ratio = cfg_cpu_clk_ctrl[3:2]; |
| |
| assign cpu_ref_clk = (cfg_cpu_clk_src_sel) ? user_clock2 : user_clock1; |
| assign cpu_clk_int = (cfg_cpu_clk_div) ? cpu_clk_div : cpu_ref_clk; |
| |
| |
| sky130_fd_sc_hd__clkbuf_16 u_clkbuf_cpu (.A (cpu_clk_int), . X(cpu_clk)); |
| |
| clk_ctl #(1) u_cpuclk ( |
| // Outputs |
| .clk_o (cpu_clk_div ), |
| // Inputs |
| .mclk (cpu_ref_clk ), |
| .reset_n (reset_n ), |
| .clk_div_ratio (cfg_cpu_clk_ratio) |
| ); |
| |
| //---------------------------------- |
| // Generate RTC Clock Generation |
| //---------------------------------- |
| wire rtc_clk_div; |
| wire rtc_ref_clk; |
| wire rtc_clk_int; |
| wire cfg_rtc_clk_src_sel = cfg_rtc_clk_ctrl[0]; |
| wire cfg_rtc_clk_div = cfg_rtc_clk_ctrl[1]; |
| wire [1:0] cfg_rtc_clk_ratio = cfg_rtc_clk_ctrl[3:2]; |
| |
| assign rtc_ref_clk = (cfg_rtc_clk_src_sel) ? user_clock2 : user_clock1; |
| assign rtc_clk_int = (cfg_rtc_clk_div) ? rtc_clk_div : rtc_ref_clk; |
| |
| |
| sky130_fd_sc_hd__clkbuf_16 u_clkbuf_rtc (.A (rtc_clk_int), . X(rtc_clk)); |
| |
| clk_ctl #(1) u_rtcclk ( |
| // Outputs |
| .clk_o (rtc_clk_div ), |
| // Inputs |
| .mclk (rtc_ref_clk ), |
| .reset_n (reset_n ), |
| .clk_div_ratio (cfg_rtc_clk_ratio) |
| ); |
| |
| |
| |
| endmodule |
