bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 112

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

102
4.0 Control Register Definitions
0x1B—Video Timing Control (VTC)
VFILT
These bits control the number of taps in the Vertical Scaling Filter. The number of taps must be
chosen in conjunction with the horizontal scale factor to ensure that the needed data does not
overflow the internal FIFO.
and equations apply:
NOTE:
If the YCOMB bit in the VSCALE_HI register is set at a logical 1, the following settings
The Bt827A can only be used with a VFILT value of 00, because it does not have a
vertical scaling filter.
ing settings and equations apply:
If the YCOMB bit in the VSCALE_HI register is set at a logical 0, the follow-
00* =
01
10
11
00* =
01
10
11
=
=
=
=
=
=
2-tap
3-tap
385 horizontal active pixels for PAL, or 361 for NTSC (CIF or
smaller).
4-tap
less than 193 horizontal active pixels for PAL, or 181 for NTSC
(QCIF or smaller).
5-tap
scaling to less than 193 horizontal active pixels for PAL, or 181
for NTSC (QCIF or smaller).
2-tap interpolation only. Available at all resolutions.
2-tap
scaling to less than 385 horizontal active pixels for PAL, or 361
for NTSC (CIF or smaller).
3-tap
when scaling to less than 193 horizontal active pixels for PAL,
or 181 for NTSC (QCIF or smaller).
4-tap
available when scaling to less than 193 horizontal active pixels
for PAL, or 181 for NTSC (QCIF or smaller).
D829BDSA
1
-- - 1
2
1
-- - 1
4
1
-- - 1
8
----- - 1
16
1
-- - 1
2
1
-- - 1
4
1
-- - 1
8
1
+
+
+
+
+
+
+
2Z
3Z
2Z
3Z
Z
Z
4Z
1 –
1 –
1 –
1 –
1 –
1 –
1 –
+
+
+
+
Available at all resolutions.
and 2-tap interpolation. Only available when
+
Z
3Z
Z
3Z
6Z
2 –
2 –
2 –
2 –
2 –
+
+
Only available when scaling to less than
and 2-tap interpolation. Only available
+
Z
Z
4Z
3 –
3 –
3 –
Only available when scaling to
and 2-tap interpolation. Only
+
Z
4 –
Only available when
VideoStream II Decoders
Bt829B