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major surgery, add memory read and write back in

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This commit is contained in:
Raphael Jacquot 2019-03-15 07:15:45 +01:00
parent f572107227
commit 175c1a48d0
3 changed files with 160 additions and 148 deletions
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2
saturn_bus.v
View file

@ -202,7 +202,7 @@ always @(posedge i_clk) begin
end
`ifdef SIM
if (cycle_ctr == 138) begin
if (cycle_ctr == 148) begin
bus_halt <= 1'b1;
$display("BUS %0d: [%d] enough cycles for now", phase, cycle_ctr);
end

5
saturn_bus_controller.v
View file

@ -84,6 +84,7 @@ saturn_control_unit control_unit (
.o_program_data (ctrl_unit_prog_data),
.o_no_read (ctrl_unit_no_read),
.i_read (bus_read),
.i_nibble (i_bus_nibble_in),
.o_error (ctrl_unit_error),
@ -119,7 +120,7 @@ saturn_control_unit control_unit (
wire [0:0] ctrl_unit_error;
wire [4:0] ctrl_unit_prog_addr;
wire [4:0] ctrl_unit_prog_data;
wire [5:0] ctrl_unit_prog_data;
wire [0:0] ctrl_unit_no_read;
wire [0:0] alu_busy;
@ -225,6 +226,7 @@ reg [3:0] dbg_bus_data;
reg [0:0] bus_error;
reg [0:0] bus_busy;
reg [0:0] bus_read;
wire [0:0] bus_clk_en = !o_debug_cycle && i_clk_en;
/*
@ -282,6 +284,7 @@ always @(posedge i_clk) begin
bus_prog_addr <= bus_prog_addr + 5'b1;
o_bus_is_data <= !ctrl_unit_prog_data[4];
o_bus_nibble_out <= ctrl_unit_prog_data[3:0];
bus_read <= ctrl_unit_prog_data[5];
o_bus_clk_en <= 1'b1;
bus_busy <= 1'b1;

301
saturn_control_unit.v
View file

@ -38,6 +38,7 @@ module saturn_control_unit (
i_program_address,
o_no_read,
i_read,
i_nibble,
o_error,
@ -82,11 +83,12 @@ input wire [31:0] i_cycle_ctr;
input wire [0:0] i_bus_busy;
output wire [4:0] o_program_data;
output wire [5:0] o_program_data;
output wire [4:0] o_program_address;
input wire [4:0] i_program_address;
output reg [0:0] o_no_read;
input wire [0:0] i_read;
input wire [3:0] i_nibble;
output wire [0:0] o_error;
@ -99,6 +101,8 @@ assign o_exec_unit_busy = i_bus_busy ||
alu_busy ||
jump_busy ||
rtn_busy ||
mem_read_busy ||
mem_write_busy ||
reset_busy ||
config_busy;
@ -178,6 +182,8 @@ saturn_inst_decoder instruction_decoder(
.o_jump_length (dec_jump_length),
.o_block_0x (dec_block_0x),
.o_mem_pointer (dec_mem_pointer),
.o_instr_type (dec_instr_type),
.o_push_pc (dec_push_pc),
.o_instr_decoded (dec_instr_decoded),
@ -198,6 +204,8 @@ wire [2:0] dec_jump_length;
/* this is necessary to identify possible RTN in time */
wire [0:0] dec_block_0x;
wire [0:0] dec_mem_pointer;
wire [3:0] dec_instr_type;
wire [0:0] dec_push_pc;
wire [0:0] dec_instr_decoded;
@ -212,6 +220,8 @@ wire [0:0] dec_error;
wire [0:0] inst_alu = (dec_instr_type == `INSTR_TYPE_ALU);
wire [0:0] inst_jump = (dec_instr_type == `INSTR_TYPE_JUMP);
wire [0:0] inst_rtn = (dec_instr_type == `INSTR_TYPE_RTN);
wire [0:0] inst_mem_read = (dec_instr_type == `INSTR_TYPE_MEM_READ);
wire [0:0] inst_mem_write = (dec_instr_type == `INSTR_TYPE_MEM_WRITE);
wire [0:0] inst_reset = (dec_instr_type == `INSTR_TYPE_RESET);
wire [0:0] inst_config = (dec_instr_type == `INSTR_TYPE_CONFIG);
@ -220,6 +230,8 @@ wire [0:0] reg_dest_hst = (dec_alu_reg_dest == `ALU_REG_HST);
wire [0:0] reg_dest_st = (dec_alu_reg_dest == `ALU_REG_ST);
wire [0:0] reg_dest_p = (dec_alu_reg_dest == `ALU_REG_P);
wire [0:0] reg_src_1_a = (dec_alu_reg_src_1 == `ALU_REG_A);
wire [0:0] reg_src_1_c = (dec_alu_reg_src_1 == `ALU_REG_C);
wire [0:0] reg_src_1_p = (dec_alu_reg_src_1 == `ALU_REG_P);
wire [0:0] reg_src_1_imm = (dec_alu_reg_src_1 == `ALU_REG_IMM);
@ -242,6 +254,8 @@ wire [0:0] inst_alu_other = inst_alu &&
wire [0:0] alu_busy = inst_alu_other || alu_start;
wire [0:0] jump_busy = (inst_jump && dec_instr_decoded) || send_reg_PC || just_reset;
wire [0:0] rtn_busy = (inst_rtn && dec_instr_decoded) || send_reg_PC;
wire [0:0] mem_read_busy = inst_mem_read || exec_mem_read;
wire [0:0] mem_write_busy = inst_mem_write || exec_mem_write;
wire [0:0] reset_busy = inst_reset;
wire [0:0] config_busy = inst_config;
@ -309,31 +323,6 @@ wire [19:0] reg_PC;
*
*************************************************************************************************/
// saturn_alu_module alu_module (
// .i_clk (i_clk),
// .i_clk_en (i_clk_en),
// .i_reset (i_reset),
// .i_phases (i_phases),
// .i_phase (i_phase),
// .i_cycle_ctr (i_cycle_ctr),
// .i_opcode (alu_opcode),
// .i_ptr_begin (alu_ptr_begin),
// .i_ptr_end (alu_ptr_end),
// .i_run (alu_run),
// .i_done (alu_done),
// .i_prep_src_1_val (alu_prep_src_1_val),
// .i_prep_src_2_val (alu_prep_src_2_val),
// .i_prep_carry (alu_prep_carry),
// .i_calc_pos (alu_calc_pos),
// .o_calc_res_1_val (alu_calc_res_1_val),
// .o_calc_res_2_val (alu_calc_res_2_val),
// .o_calc_carry (alu_calc_carry)
// );
/*
* ALU control variable
*/
@ -399,18 +388,25 @@ end
*
*************************************************************************************************/
reg [0:0] control_unit_error;
reg [0:0] just_reset;
reg [3:0] init_counter;
reg [0:0] control_unit_ready;
reg [4:0] bus_program[0:31];
reg [4:0] bus_prog_addr;
reg [2:0] addr_nibble_ptr;
reg [0:0] load_pc_loop;
reg [0:0] control_unit_error;
reg [0:0] just_reset;
reg [3:0] init_counter;
reg [0:0] control_unit_ready;
reg [5:0] bus_program[0:31];
reg [4:0] bus_prog_addr;
reg [2:0] addr_nibble_ptr;
reg [0:0] load_pc_loop;
reg [0:0] send_reg_PC;
reg [0:0] send_reg_C_A;
reg [0:0] send_pc_read;
reg [0:0] send_reg_PC;
reg [0:0] send_reg_C_A;
reg [0:0] send_reg_D0_D1;
reg [0:0] send_reg_D0_D1_done;
reg [0:0] send_dp_write;
reg [0:0] exec_mem_read;
reg [0:0] exec_mem_write;
reg [3:0] mem_access_ptr;
reg [0:0] send_pc_read;
wire [3:0] reg_PC_nibble = reg_PC[addr_nibble_ptr*4+:4];
@ -429,9 +425,15 @@ initial begin
addr_nibble_ptr = 3'd0;
load_pc_loop = 1'b0;
send_reg_PC = 1'b0;
send_reg_C_A = 1'b0;
send_pc_read = 1'b0;
send_reg_PC = 1'b0;
send_reg_C_A = 1'b0;
send_pc_read = 1'b0;
send_reg_D0_D1 = 1'b0;
send_reg_D0_D1_done = 1'b0;
send_dp_write = 1'b0;
exec_mem_read = 1'b0;
exec_mem_write = 1'b0;
mem_access_ptr = 4'h0;
/* alu control signals */
alu_start = 1'b0;
@ -470,7 +472,7 @@ always @(posedge i_clk) begin
if (init_counter == 4'hF) begin
just_reset <= 1'b0;
$display("CTRL %0d: [%d] pushing LOAD_PC command to pos %d", i_phase, i_cycle_ctr, bus_prog_addr);
bus_program[bus_prog_addr] <= {1'b1, `BUSCMD_LOAD_PC };
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_PC };
bus_prog_addr <= bus_prog_addr + 5'd1;
addr_nibble_ptr <= 3'b0;
send_reg_PC <= 1'b1;
@ -590,7 +592,7 @@ always @(posedge i_clk) begin
if (dec_instr_decoded) begin
$display("CTRL %0d: [%d] exec : JUMP/RTN reload pc to %5h", i_phase, i_cycle_ctr, reg_PC);
bus_program[bus_prog_addr] <= {1'b1, `BUSCMD_LOAD_PC };
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_PC };
bus_prog_addr <= bus_prog_addr + 5'd1;
addr_nibble_ptr <= 3'b0;
send_reg_PC <= 1'b1;
@ -609,28 +611,28 @@ always @(posedge i_clk) begin
end
endcase
end
// `INSTR_TYPE_MEM_READ:
// begin
// $display("CTRL %0d: [%d] MEM READ", i_phase, i_cycle_ctr);
// bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_DP };
// bus_prog_addr <= bus_prog_addr + 5'd1;
// addr_nibble_ptr <= 3'b0;
// send_reg_D0_D1 <= 1'b1;
// exec_mem_read <= 1'b1;
// end
// `INSTR_TYPE_MEM_WRITE:
// begin
// $display("CTRL %0d: [%d] MEM WRITE", i_phase, i_cycle_ctr);
// bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_DP };
// bus_prog_addr <= bus_prog_addr + 5'd1;
// addr_nibble_ptr <= 3'b0;
// send_reg_D0_D1 <= 1'b1;
// exec_mem_write <= 1'b1;
// end
`INSTR_TYPE_MEM_READ:
begin
$display("CTRL %0d: [%d] MEM READ", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_DP };
bus_prog_addr <= bus_prog_addr + 5'd1;
addr_nibble_ptr <= 3'b0;
send_reg_D0_D1 <= 1'b1;
exec_mem_read <= 1'b1;
end
`INSTR_TYPE_MEM_WRITE:
begin
$display("CTRL %0d: [%d] MEM WRITE", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_LOAD_DP };
bus_prog_addr <= bus_prog_addr + 5'd1;
addr_nibble_ptr <= 3'b0;
send_reg_D0_D1 <= 1'b1;
exec_mem_write <= 1'b1;
end
`INSTR_TYPE_CONFIG:
begin
$display("CTRL %0d: [%d] exec : CONFIG", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {1'b1, `BUSCMD_CONFIGURE };
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_CONFIGURE };
bus_prog_addr <= bus_prog_addr + 5'd1;
addr_nibble_ptr <= 3'b0;
send_reg_C_A <= 1'b1;
@ -638,7 +640,7 @@ always @(posedge i_clk) begin
`INSTR_TYPE_RESET:
begin
$display("CTRL %0d: [%d] exec : RESET", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {1'b1, `BUSCMD_RESET };
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_RESET };
bus_prog_addr <= bus_prog_addr + 5'd1;
send_pc_read <= 1'b1;
end
@ -665,7 +667,7 @@ always @(posedge i_clk) begin
if (send_reg_PC) begin
$display("CTRL %0d: [%d] exec: send_reg_PC[%0d] %h", i_phase, i_cycle_ctr, addr_nibble_ptr, reg_PC[addr_nibble_ptr*4+:4] );
bus_program[bus_prog_addr] <= { 1'b0, reg_PC[addr_nibble_ptr*4+:4] };
bus_program[bus_prog_addr] <= { 2'b00, reg_PC[addr_nibble_ptr*4+:4] };
addr_nibble_ptr <= addr_nibble_ptr + 3'd1;
bus_prog_addr <= bus_prog_addr + 5'd1;
if (addr_nibble_ptr == 3'd4) begin
@ -685,7 +687,7 @@ always @(posedge i_clk) begin
* used for CONFIG and UNCNFG
*/
if (send_reg_C_A) begin
bus_program[bus_prog_addr] <= { 1'b0, reg_C[{1'b0, addr_nibble_ptr}]};
bus_program[bus_prog_addr] <= { 2'b00, reg_C[{1'b0, addr_nibble_ptr}]};
addr_nibble_ptr <= addr_nibble_ptr + 3'd1;
bus_prog_addr <= bus_prog_addr + 5'd1;
if (addr_nibble_ptr == 3'd4) begin
@ -832,89 +834,89 @@ always @(posedge i_clk) begin
*
*****************************************************************************************/
// /*
// * send D0 or D1
// */
// if (send_reg_D0_D1) begin
// $display("CTRL %0d: [%d] exec: sending D%b[%0d] %h", i_phase, i_cycle_ctr,
// dec_mem_pointer, addr_nibble_ptr,
// dec_mem_pointer?reg_D1[addr_nibble_ptr]:reg_D0[addr_nibble_ptr]);
// bus_program[bus_prog_addr] <= { 2'b00, dec_mem_pointer?reg_D1[addr_nibble_ptr]:reg_D0[addr_nibble_ptr]};
// addr_nibble_ptr <= addr_nibble_ptr + 3'd1;
// bus_prog_addr <= bus_prog_addr + 5'd1;
// if (addr_nibble_ptr == 3'd4) begin
// addr_nibble_ptr <= 3'd0;
// send_reg_D0_D1 <= 1'b0;
// send_reg_D0_D1_done <= 1'b1;
// send_dp_write <= exec_mem_write;
// mem_access_ptr <= dec_alu_ptr_begin;
// end
// end
/*
* send D0 or D1
*/
if (send_reg_D0_D1) begin
$display("CTRL %0d: [%d] exec: sending D%b[%0d] %h", i_phase, i_cycle_ctr,
dec_mem_pointer, addr_nibble_ptr,
dec_mem_pointer?reg_D1[addr_nibble_ptr]:reg_D0[addr_nibble_ptr]);
bus_program[bus_prog_addr] <= { 2'b00, dec_mem_pointer?reg_D1[addr_nibble_ptr]:reg_D0[addr_nibble_ptr]};
addr_nibble_ptr <= addr_nibble_ptr + 3'd1;
bus_prog_addr <= bus_prog_addr + 5'd1;
if (addr_nibble_ptr == 3'd4) begin
addr_nibble_ptr <= 3'd0;
send_reg_D0_D1 <= 1'b0;
send_reg_D0_D1_done <= 1'b1;
send_dp_write <= exec_mem_write;
mem_access_ptr <= dec_alu_ptr_begin;
end
end
// /*
// * in case of memory write, send DP_WRITE command
// */
// if (send_reg_D0_D1_done && send_dp_write && exec_mem_write) begin
// $display("CTRL %0d: [%d] exec: sending DP_WRITE", i_phase, i_cycle_ctr);
// bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_DP_WRITE };
// bus_prog_addr <= bus_prog_addr + 5'd1;
// send_dp_write <= 1'b0;
// end
/*
* in case of memory write, send DP_WRITE command
*/
if (send_reg_D0_D1_done && send_dp_write && exec_mem_write) begin
$display("CTRL %0d: [%d] exec: sending DP_WRITE", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_DP_WRITE };
bus_prog_addr <= bus_prog_addr + 5'd1;
send_dp_write <= 1'b0;
end
// /*
// * send the data to write
// */
// if (send_reg_D0_D1_done && !send_dp_write && exec_mem_write) begin
// $display("CTRL %0d: [%d] exec: writing data %c[%h] %h", i_phase, i_cycle_ctr,
// reg_src_1_c?"C":"A", mem_access_ptr,
// reg_src_1_c?reg_C[mem_access_ptr]:reg_A[mem_access_ptr]);
// bus_program[bus_prog_addr] <= {2'b00, reg_src_1_c?reg_C[mem_access_ptr]:reg_A[mem_access_ptr]};
// mem_access_ptr <= mem_access_ptr + 4'h1;
// bus_prog_addr <= bus_prog_addr + 5'd1;
// if (mem_access_ptr == dec_alu_ptr_end) begin
// send_reg_D0_D1_done <= 1'b0;
// send_pc_read <= 1'b1;
// end
// end
/*
* send the data to write
*/
if (send_reg_D0_D1_done && !send_dp_write && exec_mem_write) begin
$display("CTRL %0d: [%d] exec: writing data %c[%h] %h", i_phase, i_cycle_ctr,
reg_src_1_c?"C":"A", mem_access_ptr,
reg_src_1_c?reg_C[mem_access_ptr]:reg_A[mem_access_ptr]);
bus_program[bus_prog_addr] <= {2'b00, reg_src_1_c?reg_C[mem_access_ptr]:reg_A[mem_access_ptr]};
mem_access_ptr <= mem_access_ptr + 4'h1;
bus_prog_addr <= bus_prog_addr + 5'd1;
if (mem_access_ptr == dec_alu_ptr_end) begin
send_reg_D0_D1_done <= 1'b0;
send_pc_read <= 1'b1;
end
end
// /*
// * send the data to write
// */
// if (send_reg_D0_D1_done && exec_mem_read) begin
// $display("CTRL %0d: [%d] exec: reading data to %c[%h]", i_phase, i_cycle_ctr,
// reg_dest_c?"C":"A", mem_access_ptr);
// bus_program[bus_prog_addr] <= 6'b100000;
// mem_access_ptr <= mem_access_ptr + 4'h1;
// bus_prog_addr <= bus_prog_addr + 5'd1;
// if (mem_access_ptr == dec_alu_ptr_end) begin
// send_reg_D0_D1_done <= 1'b0;
// send_pc_read <= 1'b1;
// mem_access_ptr <= 4'b0;
// end
// end
/*
* send the data to write
*/
if (send_reg_D0_D1_done && exec_mem_read) begin
$display("CTRL %0d: [%d] exec: reading data to %c[%h]", i_phase, i_cycle_ctr,
reg_dest_c?"C":"A", mem_access_ptr);
bus_program[bus_prog_addr] <= 6'b100000;
mem_access_ptr <= mem_access_ptr + 4'h1;
bus_prog_addr <= bus_prog_addr + 5'd1;
if (mem_access_ptr == dec_alu_ptr_end) begin
send_reg_D0_D1_done <= 1'b0;
send_pc_read <= 1'b1;
mem_access_ptr <= 4'b0;
end
end
// /*
// * wait for something to read
// */
// if (exec_mem_read && i_phases[2] && i_read) begin
// case (dec_alu_reg_dest)
// `ALU_REG_A: reg_A[mem_access_ptr] <= i_nibble;
// `ALU_REG_C: reg_C[mem_access_ptr] <= i_nibble;
// default: $display("CTRL %0d: [%d] exec read: unsupported register %0d", i_phase, i_cycle_ctr, dec_alu_reg_dest);
// endcase
// mem_access_ptr <= mem_access_ptr + 4'h1;
// end
/*
* wait for something to read
*/
if (exec_mem_read && i_phases[2] && i_read) begin
case (dec_alu_reg_dest)
`ALU_REG_A: reg_A[mem_access_ptr] <= i_nibble;
`ALU_REG_C: reg_C[mem_access_ptr] <= i_nibble;
default: $display("CTRL %0d: [%d] exec read: unsupported register %0d", i_phase, i_cycle_ctr, dec_alu_reg_dest);
endcase
mem_access_ptr <= mem_access_ptr + 4'h1;
end
// /*
// * wait for the program end, cleanup the exec_read and exec_write flags
// */
// if ((i_program_address == bus_prog_addr) &&
// !(send_reg_D0_D1 || send_reg_D0_D1_done || send_dp_write) &&
// (exec_mem_read || exec_mem_write)) begin
// $display("CTRL %0d: [%d] exec: memory transfer cleanup", i_phase, i_cycle_ctr);
// exec_mem_read <= 1'b0;
// exec_mem_write <= 1'b0;
// end
/*
* wait for the program end, cleanup the exec_read and exec_write flags
*/
if ((i_program_address == bus_prog_addr) &&
!(send_reg_D0_D1 || send_reg_D0_D1_done || send_dp_write) &&
(exec_mem_read || exec_mem_write)) begin
$display("CTRL %0d: [%d] exec: memory transfer cleanup", i_phase, i_cycle_ctr);
exec_mem_read <= 1'b0;
exec_mem_write <= 1'b0;
end
/******************************************************************************************
*
@ -927,7 +929,7 @@ always @(posedge i_clk) begin
*/
if (send_pc_read) begin
$display("CTRL %0d: [%d] exec : RESET - send PC_READ", i_phase, i_cycle_ctr);
bus_program[bus_prog_addr] <= {1'b1, `BUSCMD_PC_READ };
bus_program[bus_prog_addr] <= {2'b01, `BUSCMD_PC_READ };
bus_prog_addr <= bus_prog_addr + 5'd1;
send_pc_read <= 1'b0;
end
@ -946,9 +948,16 @@ always @(posedge i_clk) begin
addr_nibble_ptr <= 3'd0;
load_pc_loop <= 1'b0;
send_reg_PC <= 1'b0;
send_reg_C_A <= 1'b0;
send_pc_read <= 1'b0;
send_reg_PC <= 1'b0;
send_reg_C_A <= 1'b0;
send_pc_read <= 1'b0;
send_reg_D0_D1 <= 1'b0;
send_reg_D0_D1_done <= 1'b0;
send_dp_write <= 1'b0;
exec_mem_read <= 1'b0;
exec_mem_write <= 1'b0;
mem_access_ptr <= 4'h0;
/* alu control signals */
alu_start <= 1'b0;