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Serial Channel registers
234
NS7520 Hardware Reference, Rev. D 03/2006
TENC/RDEC continued
NRZI-Space (011). A 0 is represented by
a transition at the beginning of the
bit-time; the level that appears during the
previous cell us reversed. A 1 is
represented by the absence of a
transition at the beginning of the bit cell.
FM0 (100). A 0 is represented by a
transition at the beginning of the bit-time
followed by another transition in the
middle of the bit-time. A 0 is represented
by a transition only at the beginning of
the bit-time.
FM1 (101). A 1 is represented by a
transition at the beginning of the bit-time
followed by another transition in the
middle of the bit-time. A 0 is represented
by a transition only at the beginning of
the bit-time.
Manchester (110). A 1 is represented by
a high level during the first half of the bit-
time and a low level during the second
half of the bit-time. A 0 is represented by
a low level during the first half of the bit-
time and a high level during the second
half of the bit-time.
Differential Manchester (111). A 1 is
represented by a transition at the center
of the bit-time, with the opposite polarity
from the transition at the center of the
preceding bit-time. A 0 is represented by
a transition at the center of the bit-time
with the same polarity as the transition at
the center of the preceding bit-time. In
both cases, there are transitions at the
beginning of the bit-time to set up the
level required to make the correct center
transition.
See Figure 27, "Data coding example," on
page 235 for an illustration of the transmit
and receive coding methods.
D05:00 N/A Reserved N/A N/A
Bit Access Mnemonic Reset Description
Table 88: Serial Channel Control Register B bit definition