bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 47

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

Bt829B/827B
VideoStream II Decoders
period represents an 8*Fsc sampled version of the analog video signal starting in
the vicinity of the subcarrier burst and ending after the leading edge of the hori-
zontal synchronization pulse as illustrated in Figure 1-20.
Figure 1-20. VBI Sample Region
on the stability of the analog composite video signal input to the Bt829B. The
Bt829B will generate 845 16-bit VBI data words for NTSC and 1,070 16-bit VBI
data words for PAL/SECAM on each VBI line at a CLKx1 rate, assuming a nom-
inal or ideal video input signal (i.e., the analog video signal has a stable horizontal
time base). This is also equivalent to 1,690 8-bit VBI data samples for NTSC and
2,140 8-bit VBI data samples for PAL/SECAM. These values can deviate from
the nominal depending on the actual line length of the analog video signal.
edge of the Bt829B VRESET signal and the leading edge of VACTIVE.
NOTE:
therefore, if a rising edge of VRESET occurs after the horizontal active period has
already started, the VBI active period starts on the following line. The HACTIVE
pin is held at a logical 1 during the VBI horizontal active period. DVALID is held
high during both the VBI horizontal active and horizontal inactive periods (i.e., it
is held high during the whole VBI scan line.) These relationships are illustrated in
Figure 1-21.
The VBI data sample stream which is output during the VBI horizontal active
The number of VBI data samples generated on each line may vary depending
The VBI vertical active period is defined as the period between the trailing
The VBI horizontal active period starts with the trailing edge of an HRESET;
The extent of the VBI vertical active region can be controlled by setting
different values in the VDELAY register. This provides the flexibility to
configure the VBI vertical active region as any group of consecutive lines
starting with line 10 and extending to the line number set by the equivalent
line count value in the VDELAY register (i.e., the VBI vertical active
region can be extended into the video image region of the video signal).
Extent of Analog Signal Captured in VBI Samples
D829BDSA
1.9 Bt829B VBI Data Output Interface
1.0 Functional Description
37