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//////////////////////////////////////////////////////////////////////////////
// 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>
//
//////////////////////////////////////////////////////////////////////
//// ////
//// SPI Master Top Module ////
//// ////
//// This file is part of the riscduino cores project ////
//// https://github.com/dineshannayya/riscduino.git ////
//// This block integrate the SPI Master related module ////
//// - sspim_if ////
//// - sspim_ctl ////
//// - sspim_cfg ////
//// ////
//// ////
//// To Do: ////
//// nothing ////
//// ////
//// Author(s): ////
//// - Dinesh Annayya, dinesha@opencores.org ////
//// ////
//// Revision : ////
//// 0.1 - 03 Oct 2021, Dinesh A ////
//// Initial SpI Module picked from ////
//// http://www.opencores.org/cores/turbo8051/ ////
//// 0.2 - Mar 2, 2022, Dinesh A ////
//// 1. Reg Bus changes to match with wishbone format ////
//// 2. SPI tx and rx change to little endian format ////
//// i.e byte transfer [7:0],[15:8] ...[31:24] ////
//// Note: As per SPI transfer still first bit sent ////
//// out is big endian, i.e bit[7],[6] ..[0] ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// 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 sspim_top (
input logic clk ,
input logic reset_n ,
//---------------------------------
// Reg Bus Interface Signal
//---------------------------------
input logic reg_cs ,
input logic reg_wr ,
input logic [7:0] reg_addr ,
input logic [31:0] reg_wdata ,
input logic [3:0] reg_be ,
// Outputs
output logic [31:0] reg_rdata ,
output logic reg_ack ,
//-------------------------------------------
// Line Interface
//-------------------------------------------
output logic sck , // clock out
output logic so , // serial data out
input logic si , // serial data in
output logic ssn // cs_n
);
//------------------------------------
// Local declration
//------------------------------------
logic [7:0] byte_in ;
logic [7:0] byte_out ;
logic [1:0] cfg_tgt_sel ;
logic cfg_op_req ; // SPI operation request
logic cfg_endian ; // Endian selection
logic [1:0] cfg_op_type ; // SPI operation type
logic [1:0] cfg_transfer_size ; // SPI transfer size
logic [5:0] cfg_sck_period ; // sck clock period
logic [4:0] cfg_sck_cs_period ; // cs setup/hold period
logic [7:0] cfg_cs_byte ; // cs bit information
logic [31:0] cfg_datain ; // data for transfer
logic [31:0] cfg_dataout ; // data for received
logic hware_op_done ; // operation done
logic [3:0] cs_n ; // cs_n
assign ssn = cs_n[0]; // Only 1 chip select supported in riscdunio
sspim_if u_spi_if
(
. clk (clk ),
. reset_n (reset_n ),
// towards ctrl i/f
. sck_pe (sck_pe ),
. sck_int (sck_int ),
. cs_int_n (cs_int_n ),
. byte_in (byte_in ),
. load_byte (load_byte ),
. byte_out (byte_out ),
. shift_out (shift_out ),
. shift_in (shift_in ),
. cfg_tgt_sel (cfg_tgt_sel ),
. sck (sck ),
. so (so ),
. si (si ),
. cs_n (cs_n )
);
sspim_ctl u_spi_ctrl
(
. clk (clk ),
. reset_n (reset_n ),
. cfg_op_req (cfg_op_req ),
. cfg_endian (cfg_endian ),
. cfg_op_type (cfg_op_type ),
. cfg_transfer_size (cfg_transfer_size ),
. cfg_sck_period (cfg_sck_period ),
. cfg_sck_cs_period (cfg_sck_cs_period ),
. cfg_cs_byte (cfg_cs_byte ),
. cfg_datain (cfg_datain ),
. cfg_dataout (cfg_dataout ),
. op_done (hware_op_done ),
. sck_int (sck_int ),
. cs_int_n (cs_int_n ),
. sck_pe (sck_pe ),
. sck_ne (sck_ne ),
. shift_out (shift_out ),
. shift_in (shift_in ),
. load_byte (load_byte ),
. byte_out (byte_out ),
. byte_in (byte_in )
);
sspim_cfg u_cfg (
. mclk (clk ),
. reset_n (reset_n ),
// Reg Bus Interface Signal
. reg_cs (reg_cs ),
. reg_wr (reg_wr ),
. reg_addr (reg_addr ),
. reg_wdata (reg_wdata ),
. reg_be (reg_be ),
// Outputs
. reg_rdata (reg_rdata ),
. reg_ack (reg_ack ),
// configuration signal
. cfg_tgt_sel (cfg_tgt_sel ),
. cfg_op_req (cfg_op_req ), // SPI operation request
. cfg_endian (cfg_endian ),
. cfg_op_type (cfg_op_type ), // SPI operation type
. cfg_transfer_size (cfg_transfer_size ), // SPI transfer size
. cfg_sck_period (cfg_sck_period ), // sck clock period
. cfg_sck_cs_period (cfg_sck_cs_period ), // cs setup/hold period
. cfg_cs_byte (cfg_cs_byte ), // cs bit information
. cfg_datain (cfg_datain ), // data for transfer
. cfg_dataout (cfg_dataout ), // data for received
. hware_op_done (hware_op_done ) // operation done
);
endmodule