# Fyntv Architecture Definition
ARCH Fyntv
  NAME Fyntv
  VERSION 0.0.0.1
  DATE June 2026
  STATUS Draft
END

# =============================================================================
# Instruction Formats
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FORMAT R
  WIDTH 32
  FIELD opcode  6:0
  FIELD rd      11:7
  FIELD funct3  14:12
  FIELD rs1     19:15
  FIELD rs2     24:20
  FIELD funct7  31:25
END

FORMAT I
  WIDTH 32
  FIELD opcode  6:0
  FIELD rd      11:7
  FIELD funct3  14:12
  FIELD rs1     19:15
  FIELD imm     31:20
END

FORMAT S
  WIDTH 32
  FIELD opcode  6:0
  FIELD imm_lo  11:7
  FIELD funct3  14:12
  FIELD rs1     19:15
  FIELD rs2     24:20
  FIELD imm_hi  31:25
END

FORMAT B
  WIDTH 32
  FIELD opcode  6:0
  FIELD imm_4_1 11:7
  FIELD funct3  14:12
  FIELD rs1     19:15
  FIELD rs2     24:20
  FIELD imm_10_5 30:25
  FIELD imm_12  31:31
END

FORMAT U
  WIDTH 32
  FIELD opcode  6:0
  FIELD rd      11:7
  FIELD imm     31:12
END

FORMAT J
  WIDTH 32
  FIELD opcode  6:0
  FIELD rd      11:7
  FIELD imm_19_12 19:12
  FIELD imm_11  20:20
  FIELD imm_10_1 30:21
  FIELD imm_20  31:31
END