S5D2650 Samsung Semiconductor, Inc., S5D2650 Datasheet - Page 17

• Manufacturer Part Number: S5D2650
• Description: Multistandard Video Decoder/scaler
• Manufacturer: Samsung Semiconductor, Inc.

S5D2650 Data Sheet
The PID pin is used to identify whether the current V-axis is inverted in PAL mode. This signal changes at the color
burst. By noting this value at the same line of each field, a determination of whether a field is from {1-4} or {5-8} can
be made. As with the SCH pin, the S5D2650 is designed to hold the line 260 PID measurement for the entire
vertical blank period. This allows easy sampling of the PID or current field identification.
The ODD, SCH and PID signals change at different times and more than once within the video fields. Proper data
for field identification is determined by latching all three signals at the trailing edge of VS. Figure 9 shows the VS,
ODD, SCH, and PID signals and their latched values for each of the 8 possible fields. Figure 10 is the line to line
timing diagram for these signals in PAL mode.
ODD
SCH
VS
PID
ELECTRONICS
ODD
SCH
VS
Truth Table
FIELD
ODD
SCH
PID
1
H
H
H
1
2
L
L
L
Figure 8.
Figure 9.
Truth Table
FIELD
ODD
SCH
2
3
H
H
L
1
4
L
L
H
NTSC Vertical Timing Signals
1
H
H
3
PAL Vertical Timing Signals
5
H
L
H
2
L
L
2
4
L
H
L
6
3
H
L
5
L
7
H
L
4
L
H
3
8
L
L
H
6
Note:
ODD and SCH are
measured at the trailing
edge of VS.
4
7
Note:
ODD, SCH and PID are
measured at the trailing
edge of VS (VALIGN = 0).
MULTIMEDIA VIDEO
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PAGE 17 OF 95
7/18/03