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spicmd.v
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spicmd.v
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////////////////////////////////////////////////////////////////////////////////
//
// Filename: rtl/spicmd.v
// {{{
// Project: SD-Card controller
//
// Purpose: Issues commands and collects responses from the lower level
// SPI processor.
//
// Creator: Dan Gisselquist, Ph.D.
// Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
// }}}
// Copyright (C) 2016-2024, Gisselquist Technology, LLC
// {{{
// This program is free software (firmware): 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.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory. Run make with no
// target there if the PDF file isn't present.) If not, see
// <http://www.gnu.org/licenses/> for a copy.
// }}}
// License: GPL, v3, as defined and found on www.gnu.org,
// {{{
// http://www.gnu.org/licenses/gpl.html
//
////////////////////////////////////////////////////////////////////////////////
//
`timescale 1ns/1ps
`default_nettype none
// }}}
module spicmd (
// {{{
input wire i_clk, i_reset,
//
input wire i_cmd_stb,
input wire [1:0] i_cmd_type,
input wire [5:0] i_cmd,
input wire [31:0] i_cmd_data,
output reg o_busy,
//
output wire o_ll_stb,
output wire [7:0] o_ll_byte,
input wire i_ll_busy,
//
input wire i_ll_stb,
input wire [7:0] i_ll_byte,
//
output reg o_cmd_sent,
output reg o_rxvalid,
output reg [39:0] o_response
// }}}
);
// Signal declarations
// {{{
reg almost_sent;
reg [4:0] crc_valid_sreg;
reg crc_busy;
reg [4:0] crc_bit_counter;
reg [39:0] crc_shift_reg, shift_data;
reg [7:0] crc_byte;
reg rx_r1_byte, rx_check_busy, rxvalid;
reg [2:0] rx_counter;
localparam CRC_POLYNOMIAL = 7'h09; // Was 8'h12
reg [6:0] next_crc_byte;
// }}}
// o_busy
// {{{
initial o_busy = 1'b0;
always @(posedge i_clk)
if (i_reset)
o_busy <= 1'b0;
else if (!o_busy && i_cmd_stb)
o_busy <= 1'b1;
// else if (o_rxvalid)
else if (rxvalid && !rx_check_busy)
o_busy <= 1'b0;
// }}}
// shift_data
// {{{
initial shift_data = -1;
always @(posedge i_clk)
if (!o_busy && i_cmd_stb)
shift_data <= { 2'b01, i_cmd, i_cmd_data };
else if (!i_ll_busy)
begin
shift_data <= { shift_data[31:0], 8'hff };
if (crc_valid_sreg[0])
shift_data[39:32] <= crc_byte;
end
// }}}
assign o_ll_stb = o_busy;
assign o_ll_byte = shift_data[39:32];
// o_cmd_sent
// {{{
initial o_cmd_sent = 1'b0;
always @(posedge i_clk)
if (i_reset || !o_busy)
{ o_cmd_sent, almost_sent } <= 2'b00;
else if (!o_cmd_sent && !i_ll_busy)
{ o_cmd_sent, almost_sent } <= { almost_sent, crc_valid_sreg[0] };
// }}}
// crc_valid_sreg
// {{{
initial crc_valid_sreg = 5'b10000;
always @(posedge i_clk)
if (!o_busy)
crc_valid_sreg <= 5'b10000;
else if (!i_ll_busy)
crc_valid_sreg <= crc_valid_sreg >> 1;
// }}}
// crc_busy, crc_bit_counter
// {{{
initial crc_busy = 1'b0;
initial crc_bit_counter = 20;
always @(posedge i_clk)
if (!o_busy)
begin
crc_bit_counter <= 20;
crc_busy <= (i_cmd_stb);
end else if (crc_busy)
begin
crc_bit_counter <= crc_bit_counter - 1;
crc_busy <= (crc_bit_counter > 1);
end
// }}}
// crc_shift_reg
// {{{
always @(posedge i_clk)
if (!o_busy)
crc_shift_reg <= { 2'b01, i_cmd, i_cmd_data };
else if (crc_busy)
crc_shift_reg <= crc_shift_reg << 2;
// }}}
// next_crc_byte
// {{{
always @(*)
begin
next_crc_byte = { crc_byte[6:1], 1'b0 };
if (crc_byte[7] ^ crc_shift_reg[39])
next_crc_byte = next_crc_byte ^ CRC_POLYNOMIAL;
if (next_crc_byte[6] ^ crc_shift_reg[38])
next_crc_byte = (next_crc_byte<<1) ^ CRC_POLYNOMIAL;
else
next_crc_byte = (next_crc_byte<<1);
end
// }}}
// crc_byte
// {{{
initial crc_byte = 0;
always @(posedge i_clk)
if (!o_busy)
crc_byte <= 1;
else if (crc_busy)
crc_byte <= { next_crc_byte, 1'b1 };
// }}}
// rx_r1_byte, rx_counter, rxvalid, rx_check_busy
// {{{
initial rxvalid = 1'b0;
initial rx_counter = 1;
always @(posedge i_clk)
if (!o_busy)
begin
rx_r1_byte <= 1'b0;
rx_counter <= (i_cmd_type[1]) ? 5 : 1;
rx_check_busy <= (i_cmd_type == 2'b01);
rxvalid <= 1'b0;
end else if (o_cmd_sent && i_ll_stb)
begin
if (!rx_r1_byte)
rx_r1_byte <= (!i_ll_byte[7]);
if ((rx_r1_byte || !i_ll_byte[7]) && !rxvalid)
begin
rx_counter <= rx_counter - 1;
rxvalid <= (rx_counter <= 1);
end
if (rx_r1_byte && i_ll_byte != 0)
rx_check_busy <= 1'b0;
end
// }}}
// o_rxvalid
// {{{
initial o_rxvalid = 0;
always @(posedge i_clk)
if (i_reset || !o_busy)
o_rxvalid <= 0;
else if (rxvalid && !rx_check_busy)
o_rxvalid <= 1;
// }}}
// o_response
// {{{
initial o_response = -1;
always @(posedge i_clk)
if (!o_busy)
o_response <= -1;
else if (i_ll_stb)
begin
if (!rx_r1_byte)
o_response[39:32] <= i_ll_byte;
else
o_response[31:0] <= { o_response[23:0], i_ll_byte };
end
// }}}
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// Formal properties
// {{{
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
`ifdef FORMAL
`ifdef SPICMD
`define ASSUME assume
`else
`define ASSUME assert
`endif
reg f_past_valid;
reg [2:0] f_send_seq;
reg [3:0] f_rcv_seq;
reg [5:0] f_cmd;
reg [31:0] f_data;
reg [1:0] f_type;
reg [39:0] f_rcv_data;
initial f_past_valid = 0;
always @(posedge i_clk)
f_past_valid <= 1;
always @(*)
if (!o_cmd_sent)
begin
assert(!o_rxvalid);
assert(!rxvalid || !o_busy);
end else
assert(&shift_data);
always @(*)
if (!rxvalid)
assert(!o_rxvalid);
initial f_send_seq = 0;
always @(posedge i_clk)
if (i_reset || (o_busy && rxvalid && !rx_check_busy))
f_send_seq <= 0;
else if (!o_busy)
f_send_seq <= (i_cmd_stb) ? 1:0;
else if (o_busy && !o_cmd_sent && (f_send_seq < 7))
f_send_seq <= f_send_seq + (i_ll_busy ? 0:1);
always @(posedge i_clk)
if (!o_busy)
{ f_cmd, f_data, f_type } <= { i_cmd, i_cmd_data, i_cmd_type };
always @(*)
if (i_reset || !o_busy)
begin
if (!o_busy)
assert(f_send_seq == 0);
end else case(f_send_seq)
1: begin
assert(shift_data == { 2'b01, f_cmd, f_data });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b00);
assert(crc_valid_sreg == 5'b1_0000);
end
2: begin
assert(shift_data == { f_data, 8'hff });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b00);
assert(crc_valid_sreg == 5'b1000);
end
3: begin
assert(shift_data == { f_data[23:0], 16'hffff });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b00);
assert(crc_valid_sreg == 5'b100);
end
4: begin
assert(shift_data == { f_data[15:0], 24'hffffff });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b00);
assert(crc_valid_sreg == 5'b10);
end
5: begin
assert(shift_data == { f_data[7:0], 32'hffffffff });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b00);
assert(crc_valid_sreg == 5'b1);
end
6: begin
assert(shift_data == { crc_byte, 32'hffffffff });
assert(o_busy);
assert({ o_cmd_sent, almost_sent } == 2'b01);
assert(crc_valid_sreg == 5'b0);
end
7: begin
assert(shift_data == 40'hff_ffff_ffff);
assert(crc_valid_sreg == 5'b0);
assert(o_cmd_sent);
end
endcase
always @(*)
if (o_busy)
begin
assert(f_send_seq != 0);
assert(f_rcv_seq != 0);
end
always @(*)
assert(crc_bit_counter <= 20);
always @(*)
if (o_busy)
assert(crc_busy == (crc_bit_counter > 0));
// Got to give the CRC enough time to work
always @(*)
if (!o_cmd_sent)
begin
// if (crc_bit_counter > 4)
// `ASSUME(f_send_seq < 3);
if (crc_bit_counter > 2)
`ASSUME(f_send_seq < 4);
if (crc_bit_counter > 0)
`ASSUME(f_send_seq < 5);
end
always @(*)
if (o_busy && !o_cmd_sent)
assume(i_ll_byte == 8'hff);
////////////////////////////////////////////////////////////////////////
//
//
always @(*)
if (o_busy && !o_cmd_sent)
begin
assert(f_rcv_seq == 1);
assert(&o_response);
end
initial f_rcv_seq = 0;
always @(posedge i_clk)
if (i_reset)
f_rcv_seq <= 0;
else if (!o_busy)
f_rcv_seq <= (i_cmd_stb) ? 1 : 0;
else if (o_cmd_sent && i_ll_stb)
begin
assert(f_rcv_seq != 0);
if (!rx_r1_byte)
begin
if (!i_ll_byte[7]) casez(f_type)
2'b00: f_rcv_seq <= 3; // R1 response
2'b01: f_rcv_seq <= 2; // R1b response
2'b1?: f_rcv_seq <= 4; // R3/R7 response
endcase
end else case(f_rcv_seq)
1: begin assert(0); end // Should never be here
2: begin
if (i_ll_byte != 0)
f_rcv_seq <= 3;
end
3: begin end // We'll stop here with R1b
4: f_rcv_seq <= f_rcv_seq + 1;
5: f_rcv_seq <= f_rcv_seq + 1;
6: f_rcv_seq <= f_rcv_seq + 1;
7: f_rcv_seq <= f_rcv_seq + 1;
default: begin end
endcase
end
always @(posedge i_clk)
if (i_ll_stb)
begin
if (!rx_r1_byte)
f_rcv_data[39:32] <= i_ll_byte;
else
f_rcv_data[31:0] <= { f_rcv_data[23:0], i_ll_byte };
end
always @(*)
if (!i_reset && o_busy && f_rcv_seq > 0)
case(f_rcv_seq)
1: begin
assert(!rx_r1_byte);
assert(rx_counter == ((f_type[1]) ? 5 : 1));
assert(rx_check_busy == (f_type == 2'b01));
assert(!rxvalid);
assert(f_send_seq != 0);
assert(&o_response[31:0]);
end
2: begin
assert(o_cmd_sent);
assert(rx_r1_byte);
assert(rx_counter == 0);
assert(rx_check_busy);
assert(rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
// assert(&o_response[31:0]);
end
3: begin
assert(o_cmd_sent);
assert(rx_r1_byte);
assert(rx_counter == 0);
assert(!rx_check_busy);
assert(rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
// assert(&o_response[31:8]);
end
4: begin
assert(rx_r1_byte);
assert(rx_counter == 4);
assert(!rx_check_busy);
assert(!rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
assert(&o_response[31:0]);
end
5: begin
assert(rx_r1_byte);
assert(rx_counter == 3);
assert(!rx_check_busy);
assert(!rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
assert(o_response[7:0] == f_rcv_data[7:0]);
assert(&o_response[31:8]);
end
6: begin
assert(rx_r1_byte);
assert(rx_counter == 2);
assert(!rx_check_busy);
assert(!rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
assert(o_response[15:0] == f_rcv_data[15:0]);
assert(&o_response[31:16]);
end
7: begin
assert(rx_r1_byte);
assert(rx_counter == 1);
assert(!rx_check_busy);
assert(!rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
assert(o_response[23:0] == f_rcv_data[23:0]);
assert(&o_response[31:24]);
end
8: begin
assert(rx_r1_byte);
assert(rx_counter == 0);
assert(!rx_check_busy);
assert(rxvalid);
assert(o_response[39:32] == f_rcv_data[39:32]);
end
default: assert(f_rcv_seq <= 8);
endcase
always @(*)
assert(rxvalid == (rx_counter == 0));
////////////////////////////////////////////////////////////////////////
//
// Cover properties
//
////////////////////////////////////////////////////////////////////////
//
//
always @(*)
begin
cover(o_cmd_sent);
cover(f_rcv_seq == 1);
cover(f_rcv_seq == 2);
cover(f_rcv_seq == 3);
cover(f_rcv_seq == 4);
cover(f_rcv_seq == 5);
cover(f_rcv_seq == 6);
cover(f_rcv_seq == 7);
cover(f_rcv_seq == 8);
end
always @(posedge i_clk)
cover(o_rxvalid && f_cmd == 0 && f_data == 0);
always @(posedge i_clk)
cover(o_rxvalid && f_cmd == 0 && f_data == 0
&& crc_byte == 8'h95);
`endif
// }}}
endmodule