KS0123 View Datasheet(PDF) - Samsung
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KS0123 Datasheet PDF : 44 Pages
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KS0123 Data Sheet
MULTIMEDIA VIDEO
The subcarrier instantaneous phaseis a 13-bit integer which defines the phase of the reference subcarrier at the
synch tip. The subcarrier frequency synthesizer phase will be reset to this number at the synch tip when both
HANC datum PHV and control register APHEN are ‘1’s.
Table 3: Definition of Subcarrier Instantaneous Phase
subcarrier phase #
0
1
...
8191
phase value
([3600 / 8192]) * 0
([3600 / 8192]) * 1
...
([3600 / 8192]) * 8191
The MPEG II system allows the 27 MHz clock frequency to vary to prevent the input buffer from overflow or
underflow. When this happens the color subcarrier frequency will shift if the addend of numerical oscillator is not
adjusted accordingly. If control register bit AFREN is ‘1’the subcarrier synthersizer will select the latched HANC’s
subcarrier frequencydata (FR) as the addend instead of the programmable register (0x8-0xb) (Figure 6). The FR
is latched if HANC datum FRV = ‘1’. and the HANC control register’s AFREN bit is set. The FR’s value should be
calculated using the equation
FR = NINT232 • F--C---s--k-c--
where Fsc is the desired color subcarrier frequency,
Ck is the clock frequency,
and NINT is the nearest integer.
Modified on May/04/2000
PAGE 10 OF 44
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