KS0123 데이터 시트보기 (PDF) - Samsung

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KS0123

DIGITAL VIDEO ENCODER

Samsung 

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 = NINT232 • 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

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