bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 25

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

Bt829B/827B
VideoStream II Decoders
Figure 1-3. UltraLock Behavior for NTSC Square Pixel Output
original video stream as long as the sum of the nominal pixel line length (910 for
NTSC and 1,135 for PAL/SECAM) and the worst case line length variation from
nominal in the active region is greater than or equal to the required number of
output pixels per line, for example:
where:
NOTE:
Waveform
UltraLock can be used to extract any programmable number of pixels from the
the FIFO
Ultralock
Per Line
Sent to
Analog
Length
Pixels
Pixels
Line
by
For stable inputs, UltraLock guarantees the time between the falling edges
of HRESET only to within one pixel. UltraLock does, however, guarantee
the number of active pixels in a line as long as the stated relationship
holds.
P
P
P
Nom
Var
Desired
905 pixels
780 pixels
63.2 s
= Nominal number of pixels per line at 4*Fsc sample rate
= Variation of pixel count from nominal at 4*Fsc (can be a
= Desired number of output pixels per line
(910 for NTSC, 1,135 for PAL/SECAM)
positive or negative number)
D829BDSA
P
Nom
+
P
Var
910 pixels
780 pixels
63.5 s
P
Desired
1.0 Functional Description
913 pixels
780 pixels
63.8 s
1.4 UltraLock
15