Z16C30_08 Datasheet, PDF (47/102 Pages) Zilog, Inc. – CMOS USC Universal Serial Controller

Z16C30
Product Specification
43
NRZ—In NRZ, a 1 is represented by a High level for the duration of the bit cell and a 0 is
represented by a Low level for the duration of the bit cell.
NRZB—Data is inverted from NRZ.
NRZI-Mark—In NRZI-Mark, a 1 is represented by a transition at the beginning of the bit
cell. That is, the level present in the preceding bit cell is reversed. A 0 is represented by the
absence of a transition at the beginning of the bit cell.
NRZI-Space—In NRZI-Space, a 1 is represented by the absence of a transition at the
beginning of the bit cell. That is, the level present in the preceding bit cell is maintained. A
0 is represented by a transition at the beginning of the bit cell.
Biphase-Mark—In Biphase-Mark, a 1 is represented by a transition at the beginning of the
bit cell and another transition at the center of the bit cell. A 0 is represented by a transition
at the beginning of the bit cell only.
Biphase-Space—In Biphase-Space, a 1 is represented by a transition at the beginning of
the bit cell only. A 0 is represented by a transition at the beginning of the bit cell and
another transition at the center of the bit cell.
Biphase-Level—In Biphase-Level, a 1 is represented by a High during the first half of the
bit cell and a Low during the second half of the bit cell. A 0 is represented by a Low dur-
ing the first half of the bit cell and a High during the second half of the bit cell.
DS007902-0708
PRELIMINARY
Functional Description