Information

Sample Values (15,16,1,2,3) Action / Event
SDDSS In this case, either multiple errors occurred, two or more
noise, or two or more noise and a time shift. The most likely
case is that samples 16 and 1 are noise. Therefore, no
adjustment to time base is made.
SDDSD The most likely case is noise for sample 2 and a time shift.
Therefore, the time base is sped up by one. Sample 16
becomes sample 1, sample 1 becomes sample 2, sample 2
becomes sample 3, sample 3 becomes sample 4, and the
next sample taken is sample 5.
SDDDS The most likely case is noise for sample 3 and a time shift.
Therefore, the time base is sped up by one. Sample 16
becomes sample 1, sample 1 becomes sample 2, sample 2
becomes sample 3, sample 3 becomes sample 4, and the
next sample taken is sample 5.
SDDDD Either sample 16 is noise or the time base has shifted. In this
case, it is assumed that a time shift has occurred. Therefore,
the time base is sped up by one. Sample 15 becomes
sample 1, sample 1 becomes sample 2, sample 2 becomes
sample 3, sample 3 becomes sample 4, and the next sample
taken is sample 5.
DSSSS It is most likely that sample 16 is noise and there is no start of
bit transition. Therefore, no adjustment to time base is made.
DSSSD It is most likely that sample 15 is noise along with time shift.
In this case, the time base is slowed down by two. Sample 3
becomes sample 1. The next sample is treated as sample 2.
DSSDS In this case, multiple errors occurred. Therefore, no
adjustment to time base is made
DSSDD Either multiple errors occurred, possibly with time shift, or
sample 15 is noise. In this case, the time base is slowed
down by one. Sample 2 becomes sample 1, and sample 3
becomes sample 2. The next sample is treated as sample 3.
DSDSS In this case, multiple errors occurred. Therefore, no
adjustment to time base is made.
DSDSD In this case, multiple errors occurred. Therefore, no
adjustment to time base is made.
DSDDS In this case, multiple errors occurred. Therefore, no
adjustment to time base is made.
DSDDD In this case, either multiple errors occurred or sample 15 is
noise and there is no start of bit transition. Therefore, no
adjustment to time base is made.
DDSSS In this case multiple errors occurred. It is most likely that
samples 15 and 16 are noise. Therefore, no adjustment to
time base is made.
DDSSD In this case multiple errors occurred. Therefore, no
adjustment to time base is made.
DDSDS In this case multiple errors occurred. Therefore, no
adjustment to time base is made.
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Functional description
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
1102 Freescale Semiconductor, Inc.