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tinyriscv/rtl/id.v

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first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
/*
Copyright 2019 Blue Liang, liangkangnan@163.com
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.
*/
`include "defines.v"
rename openriscv to tinyriscv Signed-off-by: liangkangnan <liangkangnan@163.com>
2020-02-23 09:01:45 +00:00
// identification module
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
module id (
input wire clk,
input wire rst,
input wire[`SramBus] inst_i, // inst content
input wire[`SramAddrBus] inst_addr_i, // inst addr
input wire jump_flag_ex_i,
add div inst Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-13 00:26:41 +00:00
input wire hold_flag_ex_i,
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
// to regs
output reg reg1_re_o, // reg1 read enable
output reg[`RegAddrBus] reg1_raddr_o, // reg1 read addr
output reg reg2_re_o, // reg2 read enable
output reg[`RegAddrBus] reg2_raddr_o, // reg2 read addr
output reg reg_we_o, // reg write enable
output reg[`RegAddrBus] reg_waddr_o, // reg write addr
// to ex
output reg[`SramBus] inst_o,
output reg inst_valid_o, // inst is valid flag
output reg[`SramAddrBus] inst_addr_o,
// to sram
output reg sram_re_o, // ram read enable
output reg sram_we_o // ram write enable
rename openriscv to tinyriscv Signed-off-by: liangkangnan <liangkangnan@163.com>
2020-02-23 09:01:45 +00:00
);
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
wire[6:0] opcode = inst_i[6:0];
wire[2:0] funct3 = inst_i[14:12];
add mul instruction Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-02 08:12:13 +00:00
wire[6:0] funct7 = inst_i[31:25];
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
wire[4:0] rd = inst_i[11:7];
wire[4:0] rs1 = inst_i[19:15];
wire[4:0] rs2 = inst_i[24:20];
always @ (posedge clk) begin
if (rst == `RstEnable) begin
inst_o <= `ZeroWord;
reg_we_o <= `WriteDisable;
sram_we_o <= `WriteDisable;
reg1_re_o <= `ReadDisable;
reg2_re_o <= `ReadDisable;
sram_re_o <= `ReadDisable;
inst_valid_o <= `InstInvalid;
end else if (jump_flag_ex_i == `JumpEnable && inst_i != `INST_NOP) begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
inst_o <= `INST_NOP;
add div inst Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-13 00:26:41 +00:00
end else if (hold_flag_ex_i == `HoldEnable) begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
inst_o <= `INST_NOP;
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
end else begin
inst_o <= inst_i;
inst_addr_o <= inst_addr_i;
case (opcode)
`INST_TYPE_I: begin
case (funct3)
`INST_ADDI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_SLTI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_SLTIU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_XORI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_ORI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_ANDI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_SLLI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
`INST_SRI: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
sram_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end
add mul instruction Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-02 08:12:13 +00:00
`INST_TYPE_R_M: begin
if ((funct7 == 7'b0000000) || (funct7 == 7'b0100000)) begin
case (funct3)
`INST_ADD_SUB: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_SLL: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_SLT: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_SLTU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_XOR: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_SR: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_OR: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_AND: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end else if (funct7 == 7'b0000001) begin
case (funct3)
`INST_MUL: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_MULHU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_MULH: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_MULHSU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
add div inst Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-13 00:26:41 +00:00
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_DIV: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteDisable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_DIVU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteDisable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_REM: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteDisable;
reg_waddr_o <= rd;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
`INST_REMU: begin
inst_valid_o <= `InstValid;
reg_we_o <= `WriteDisable;
reg_waddr_o <= rd;
add mul instruction Signed-off-by: Blue Liang <liangkangnan@163.com>
2020-01-02 08:12:13 +00:00
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end
first release Signed-off-by: Blue Liang <liangkangnan@163.com>
2019-12-04 00:47:19 +00:00
end
`INST_TYPE_L: begin
case (funct3)
`INST_LB: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
sram_re_o <= `ReadEnable;
sram_we_o <= `WriteDisable;
end
`INST_LH: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
sram_re_o <= `ReadEnable;
sram_we_o <= `WriteDisable;
end
`INST_LW: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
sram_re_o <= `ReadEnable;
sram_we_o <= `WriteDisable;
end
`INST_LBU: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
sram_re_o <= `ReadEnable;
sram_we_o <= `WriteDisable;
end
`INST_LHU: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
sram_re_o <= `ReadEnable;
sram_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end
`INST_TYPE_S: begin
case (funct3)
`INST_SB: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteEnable;
sram_re_o <= `ReadEnable;
reg_we_o <= `WriteDisable;
end
`INST_SH: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteEnable;
sram_re_o <= `ReadEnable;
reg_we_o <= `WriteDisable;
end
`INST_SW: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_re_o <= `ReadEnable;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteEnable;
reg_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end
`INST_TYPE_B: begin
case (funct3)
`INST_BEQ: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_BNE: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_BLT: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_BGE: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_BLTU: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_BGEU: begin
inst_valid_o <= `InstValid;
reg1_re_o <= `ReadEnable;
reg2_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg2_raddr_o <= rs2;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
end
endcase
end
`INST_JAL: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
end
`INST_JALR: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteEnable;
reg1_re_o <= `ReadEnable;
reg1_raddr_o <= rs1;
reg_waddr_o <= rd;
end
`INST_LUI: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
end
`INST_AUIPC: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteEnable;
reg_waddr_o <= rd;
end
`INST_NOP: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
`INST_FENCE: begin
inst_valid_o <= `InstValid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
default: begin
inst_valid_o <= `InstInvalid;
sram_we_o <= `WriteDisable;
reg_we_o <= `WriteDisable;
end
endcase
end
end
endmodule