Changes binary notation in ControlUnit to make formatter happy

This commit is contained in:
2025-11-07 10:41:09 +01:00
parent 1adf33810f
commit 0e991583b9

View File

@@ -24,8 +24,8 @@ object OpType extends ChiselEnum {
object OpCode extends ChiselEnum {
// Type U
val LUI = 0b0110111.U
val AUIPC = 0b0010111.U
val LUI = "b0110111".U
val AUIPC = "b0010111".U
// Type I + Type IR
@@ -36,7 +36,7 @@ object OpCode extends ChiselEnum {
// addi, andi, ori, xori, slli, srli, srai,
// slti, sltiu
val OpImm = 0b0010011.U
val OpImm = "b0010011".U
// Instruction format
// xxx rd, rs1, rs2
@@ -44,11 +44,10 @@ object OpCode extends ChiselEnum {
// and writes back to a register
// add, and, or, xor, sll, srl, sra, slt, stlu
val OpR = 0b0110011.U;
val OpR = "b0110011".U;
}
class ControlUnit() extends Module {
val io = IO(new CUInterface())
@@ -67,13 +66,13 @@ class ControlUnit() extends Module {
switch(opcode) {
// U instructions
is(OpCode.LUI) {
is(OpCode.LUI) {
io.reg_file_we := true.B // Write to regfile
io.mux_alu_imm := false.B // Send immy directly to refile
io.optype := OpType.U
}
is(OpCode.AUIPC) {
io.alu_opcode := AluOpCode.Add
io.alu_opcode := AluOpCode.Add
io.reg_file_we := true.B // Write to regfile
io.mux_rega_pc := false.B // Send PC to ALU A
io.mux_alu_imm := false.B; // Send immu to ALU B
@@ -85,7 +84,7 @@ class ControlUnit() extends Module {
io.reg_file_we := true.B
opImm(funct3, funct7, io);
}
// OpR instructions
is(OpCode.OpR) {
io.reg_file_we := true.B
@@ -93,188 +92,175 @@ class ControlUnit() extends Module {
}
}
// Implements functions for all instruction of the opImm kind
def opImm(funct3: UInt, funct7: UInt, io: CUInterface) =
{
// Meaning of Funct3 in the context of an OpImm instruction
object Funct3 extends ChiselEnum
{
// Type I
val ADDI = 0b000.U
val SLTI = 0b010.U
val SLTIU = 0b011.U
val XORI = 0b100.U
val ORI = 0b110.U
val ANDI = 0b111.U
def opImm(funct3: UInt, funct7: UInt, io: CUInterface) = {
// Meaning of Funct3 in the context of an OpImm instruction
object Funct3 extends ChiselEnum {
// Type I
val ADDI = "b000".U
val SLTI = "b010".U
val SLTIU = "b011".U
val XORI = "b100".U
val ORI = "b110".U
val ANDI = "b111".U
// Type IR
val SLLI = 0b001.U
val SRLI_SRAI = 0b101.U // Right shifts
}
// Type IR
val SLLI = "b001".U
val SRLI_SRAI = "b101".U // Right shifts
}
// Meaning of Funct7 in the context of SHIFTR IR instructions
object IRFunct7 extends ChiselEnum
{
val SRLI = 0b0000000.U
val SRAI = 0b0100000.U
}
// Meaning of Funct7 in the context of SHIFTR IR instructions
object IRFunct7 extends ChiselEnum {
val SRLI = "b0000000".U
val SRAI = "b0100000".U
}
io.mux_regb_imm := false.B; // OpImm are operations with imm, so send imm to ALU
io.mux_alu_imm := true.B;
io.mux_rega_pc := true.B;
switch(funct3)
{
// Type I
is(Funct3.ADDI)
{
io.alu_opcode := AluOpCode.Add
io.optype := OpType.I
}
is(Funct3.ANDI)
{
io.alu_opcode := AluOpCode.And
io.optype := OpType.I
}
is(Funct3.ORI)
{
io.alu_opcode := AluOpCode.Or
io.optype := OpType.I
}
is(Funct3.XORI)
{
io.alu_opcode := AluOpCode.Xor
io.optype := OpType.I
}
is(Funct3.SLLI)
{
io.alu_opcode := AluOpCode.ShiftLeft
io.optype := OpType.I
}
is(Funct3.SLTI)
{
io.alu_opcode := AluOpCode.LessThanSigned
io.optype := OpType.I
}
is(Funct3.SLTIU)
{
io.alu_opcode := AluOpCode.LessThanUnsigned
io.optype := OpType.I
}
// Type IR
is(Funct3.SRLI_SRAI)
{
io.optype := OpType.IR
switch(funct7)
io.mux_regb_imm := false.B; // OpImm are operations with imm, so send imm to ALU
io.mux_alu_imm := true.B;
io.mux_rega_pc := true.B;
switch(funct3) {
// Type I
is(Funct3.ADDI)
{
is(IRFunct7.SRLI)
{
io.alu_opcode := AluOpCode.ShiftRight
}
is(IRFunct7.SRAI)
{
io.alu_opcode := AluOpCode.ShiftArithmeticRight
}
io.alu_opcode := AluOpCode.Add
io.optype := OpType.I
}
}
}
}
is(Funct3.ANDI)
{
io.alu_opcode := AluOpCode.And
io.optype := OpType.I
}
is(Funct3.ORI)
{
io.alu_opcode := AluOpCode.Or
io.optype := OpType.I
}
is(Funct3.XORI)
{
io.alu_opcode := AluOpCode.Xor
io.optype := OpType.I
}
is(Funct3.SLLI)
{
io.alu_opcode := AluOpCode.ShiftLeft
io.optype := OpType.I
}
is(Funct3.SLTI)
{
io.alu_opcode := AluOpCode.LessThanSigned
io.optype := OpType.I
}
is(Funct3.SLTIU)
{
io.alu_opcode := AluOpCode.LessThanUnsigned
io.optype := OpType.I
}
// Type IR
is(Funct3.SRLI_SRAI)
{
io.optype := OpType.IR
switch(funct7)
{
is(IRFunct7.SRLI)
{
io.alu_opcode := AluOpCode.ShiftRight
}
is(IRFunct7.SRAI)
{
io.alu_opcode := AluOpCode.ShiftArithmeticRight
}
}
}
}
}
// Implements functions for all instruction of the opR kind
def opR(funct3: UInt, funct7: UInt, io: CUInterface) =
{
// Meaning of Funct3 in the context of an OpR instruction
object Funct3 extends ChiselEnum
{
// Type I
val ADD = 0b000.U
val AND = 0b111.U
val OR = 0b110.U
val XOR = 0b100.U
val SLL = 0b001.U
val SLT = 0b010.U
val SLTU = 0b011.U
def opR(funct3: UInt, funct7: UInt, io: CUInterface) = {
// Meaning of Funct3 in the context of an OpR instruction
object Funct3 extends ChiselEnum {
// Type I
val ADD = "b000".U
val AND = "b111".U
val OR = "b110".U
val XOR = "b100".U
val SLL = "b001".U
val SLT = "b010".U
val SLTU = "b011".U
// Arithmetic op (discriminate by Funct7)
val SRL_SRA = 0b101.U
}
// Arithmetic op (discriminate by Funct7)
val SRL_SRA = "b101".U
}
// Meaning of Funct7 in the context of SHIFTR IR instructions
object IRFunct7 extends ChiselEnum
{
val SRL = 0b0000000.U
val SRA = 0b0100000.U
}
// Meaning of Funct7 in the context of SHIFTR IR instructions
object IRFunct7 extends ChiselEnum {
val SRL = "b0000000".U
val SRA = "b0100000".U
}
io.mux_regb_imm := true.B; // OpImm are operations with imm, so send imm to ALU
io.mux_rega_pc := true.B;
io.mux_alu_imm := true.B;
switch(funct3)
{
// Type I
is(Funct3.ADD)
{
io.alu_opcode := AluOpCode.Add
}
is(Funct3.AND)
{
io.alu_opcode := AluOpCode.And
}
is(Funct3.OR)
{
io.alu_opcode := AluOpCode.Or
}
is(Funct3.XOR)
{
io.alu_opcode := AluOpCode.Xor
}
is(Funct3.SLL)
{
io.alu_opcode := AluOpCode.ShiftLeft
}
is(Funct3.SLT)
{
io.alu_opcode := AluOpCode.LessThanSigned
}
is(Funct3.SLTU)
{
io.alu_opcode := AluOpCode.LessThanUnsigned
}
// Type IR
is(Funct3.SRL_SRA)
{
switch(funct7)
io.mux_regb_imm := true.B; // OpImm are operations with imm, so send imm to ALU
io.mux_rega_pc := true.B;
io.mux_alu_imm := true.B;
switch(funct3) {
// Type I
is(Funct3.ADD)
{
is(IRFunct7.SRL)
{
io.alu_opcode := AluOpCode.ShiftRight
}
is(IRFunct7.SRA)
{
io.alu_opcode := AluOpCode.ShiftArithmeticRight
}
io.alu_opcode := AluOpCode.Add
}
}
}
is(Funct3.AND)
{
io.alu_opcode := AluOpCode.And
}
is(Funct3.OR)
{
io.alu_opcode := AluOpCode.Or
}
is(Funct3.XOR)
{
io.alu_opcode := AluOpCode.Xor
}
is(Funct3.SLL)
{
io.alu_opcode := AluOpCode.ShiftLeft
}
is(Funct3.SLT)
{
io.alu_opcode := AluOpCode.LessThanSigned
}
is(Funct3.SLTU)
{
io.alu_opcode := AluOpCode.LessThanUnsigned
}
// Type IR
is(Funct3.SRL_SRA)
{
switch(funct7)
{
is(IRFunct7.SRL)
{
io.alu_opcode := AluOpCode.ShiftRight
}
is(IRFunct7.SRA)
{
io.alu_opcode := AluOpCode.ShiftArithmeticRight
}
}
}
}
}
}