openpower/sv/byteswap.mdwn

   1 [[!tag standards]]
   2
   3 # Byte-swapping
   4
   5 ## Byte-swapping Mux
   6
   7 gate count for 4:1 MUX is estimated at 8 gates.  8x 64 gates for a total of 512 gates to provide aligned byteswapping 64 bit. (actually likely 5x64 for MUX part and 2x8 for selection part)
   8
   9 <img alt="Byte-swap mux diagram" src="../byteswap_mux.svg" width="100%"/>
  10
  11 ## Byte-swapping Pipe
  12
  13 per source and dest operand, 512 gates required.  if two source operands (ALU pipeline, Logical pipeline) this totals 1600 gates (per Function Unit).  3 operands (madd) is 2000 gates.  for an estimated 50 Function Units this totals around 100,000 gates.
  14
  15 <img alt="Byte-swap pipe diagram" src="../byteswap_pipe.svg" width="100%"/>