7-bit SCALAR:
   +--------+
   |0sssssss|
   +--------+

   11-bit SCALAR:
   +--------+--------+
   |110sssss|XXssssss|
   +--------+--------+

   16-bit SCALAR:
   +--------+--------+--------+
   |1110ssss|XXssssss|XXssssss|
   +--------+--------+--------+

   21-bit SCALAR:
   +--------+--------+--------+--------+
   |11110sss|XXssssss|XXssssss|XXssssss|
   +--------+--------+--------+--------+