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Rabbit 6000 User’s Manual
digi.com
208
counts every bit cell, the maximum difference between the sending data rate and the DPLL output
clock rate is 1/48 (~2%).
With biphase data encoding (either biphase-level, biphase-mark, or biphase-space), the DPLL
runs only as long as transitions are present in the receive data stream. Two consecutive missed
transitions causes the DPLL to halt operation and wait for the next available transition. This mode
of operation is necessary because it is possible for the DPLL to lock onto the optional transitions
in the receive data stream. Since they are optional, they will eventually not be present, and the
DPLL can attempt to lock onto the required transitions. Since the DPLL can adjust by one count
every bit cell, the maximum difference between the sending data rate and the DPLL output clock
rate is 1/16 (~6%).
With biphase data encoding, the DPLL is designed to work in multiple-access conditions where
there might not be flags on an idle line. The DPLL will generate an output clock correctly based
on the first transition in the leading zero of an opening flag. Similarly, only the completion of the
closing flag is necessary for the DPLL to provide the extra two clocks to the receiver to assemble
the data correctly. The transition is specified as follows.
•
In the biphase-level mode this means the transition that defines the last zero of the closing flag.
•
In the biphase-mark and the biphase-space modes this means the transition that defines the end
of the last zero of the closing flag.
Содержание 6000
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Страница 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Страница 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...