z1255/fpu_new

For CPU experiment

Performance (KCU105)

• fadd (fadd.v) 100MHz 1clock

• fsub (fsub.v) 100MHz 1clock

• fmul: 100MHz 1clock (Maximum operating frequency = 160MHz)

• fdiv (fdiv.v): 100MHz 3clock

• fsqrt: 100MHz 2clock (Pipeline) (Maximum operating frequency = 160MHz)

• itof: 100MHz 1clock (Maximum operating frequency = 150MHz)

• ftoi: 100MHz 1clock

• floor: 100MHz 1clock

• fless: 100MHz 1clock

• fadd_200 215MHz 2clock

• fmul 207MHz 2clock

• fdiv_200 210MHz 4clock

• fsqrt_200 250MHz 3clock

• ftoi 226MHz 1clock

• itof 206MHz 1clock

• floor 225MHz 1clock

Utilization (KCU105)

• fadd (fadd.v) LUT 303, FF 96
• fsub (fsub.v) LUT 577, FF 96
• fmul: LUT 53, FF 96, DSP 2
• fdiv (fdiv.v): LUT 103, FF 167, DSP 3
• itof: LUT 246, FF 64
• ftoi: LUT 264, FF 64
• floor LUT 210, FF 64

Dependency

• fdiv (fdiv.v)
  • fmul_for_fdiv (fmul_for_fdiv.v)
  • finv (finv.v)
    • finv_const_table (finv_table.v)
    • finv_grad_table (finv_table.v)
• fsqrt (fsqrt.v)
  • fsqrt_const_table (fsqrt_table.v)
  • fsqrt_grad_table (fsqrt_table.v)

Notes

• fmul, fdiv and fsqrt only support normalized numbers.
  • if the exponent is 0, then the mantissa is set to 0 and the number is regarded as 0.
  • if the exponent is 255, then the mantissa is set to 0 and the number is regarded as infinity.
• fsqrt
  • If you enter negative number in fsqrt, 0 will be returned.
• ftoi
  • If you enter more than 2^31, 0x7fffffff will be returned.
  • If you enter less than -2^31, 0x80000001 will be returned.