S5D0127X01 Datasheet, PDF (16/96 Pages) Samsung semiconductor – MULTISTANDARD VIDEO DECODER/SCALER

S5D0127X01 Data Sheet
MULTIMEDIA VIDEO
current field. To distinguish between fields 1, 2 verse fields 3, 4 (or fields 1, 2, 3, 4 verse fields 5, 6, 7, 8 for PAL) the
phase of the color burst relative to the sync tip must be measured. That information is provided by the SCH pin.
The S5D0127X01 provides the output of a comparator that measures whether the current color burst phase
relative to the falling edge of the sync is greater or less than a predetermined constant. This constant is controlled
with SCHCMP[3:0]. The polarity of the SCH output pin depends on the current SCHCMP[3:0] value. The SCH
signal changes every video line. The SCH for line 260 is held for the entire vertical blanking period. By using the
SCH signal for the same line from each field, proper field identification can be determined. Figure 8 shows field
identification values for SCHCMP[3:0]=0. It is important to note that the SCH value is only valid for video signals
that have a constant sync tip to color burst relationship. This is not the case with consumer VCRs.
.
HS1
(default)
ODD FIELD and VALIGN = 0
VS
ODD
60 Hz - CCIR 601 = 885, Square = 708
50 Hz - CCIR 601 = 891, Square = 971
0, except 60 Hz Square = 2
EVEN FIELD or VALIGN = 1
27, except 60 Hz Square = 28
VS
ODD
0, except 60 Hz Square = 2
15, except 60 Hz Square = 14
VAV
HAV
EVAV
default width for each input standard and output mode
60 Hz - 261
50 Hz - CCIR 601 = 273, Square = 341
Note: Numbers shown are in CK. Active high polarities are used. Timing shown for VAV and EVAV are with qualifier off.
Figure 7. Short Term Vertical Timing
ELECTRONICS
Modified on May/04/2000
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