bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 93

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

Bt829B
VideoStream II Decoders
0x02—Temporal Decimation Register (TDEC)
The MPU can read or write to this control register at any time. Upon reset, it is initialized to 0x00.
DEC_RAT(0) is the LSB. This register enables temporal decimation by discarding a finite number of fields or
frames from the incoming video. An asterisk indicates the default option.
DEC_FIELD
FLDALIGN
DEC_RAT
0x03—MSB Cropping Register (CROP)
The MPU can read or write to this control register at any time. Upon reset, it is initialized to 0x12.
HACTIVE_MSB(0) is the LSB. See the VACTIVE, VDELAY, HACTIVE, and HDELAY registers for descrip-
tions on the operation of this register.
VDELAY_MSB
VACTIVE_MSB
HDELAY_MSB
HACTIVE_MSB
DEC_FIELD
7
0
7
0
VDELAY_MSB
FLDALIGN
This bit defines whether decimation occurs according to fields or frames.
This bit aligns the start of decimation with an even or odd field.
DEC_RAT is the number of fields or frames dropped out of 60 NTSC or 50 PAL/SECAM
fields or frames. 0x00 value disables decimation (all video frames and fields are output).
NOTE:
00xx xxxx–11xx xxxx = The most significant two bits of vertical delay register.
xx00 xxxx–xx11 xxxx = The most significant two bits of vertical active register.
xxxx 00xx–xxxx 11xx = The most significant two bits of horizontal delay register.
xxxx xx00–xxxx xx11 = The most significant two bits of horizontal active register.
6
0
6
0
Use caution when changing the programming in the TDEC register. 0x00 must be
loaded before the decimation value. This ensures that decimation does not start on the
wrong field or frame. The register should not be loaded with DEC_RAT greater than
60 (0x3C) for NTSC, or greater than 50 (0x34) for PAL/SECAM.
xx00 0000–xx11 1111 = Number of fields/frames dropped.
5
0
5
0
VACTIVE_MSB
0*
1
0*
1
=
=
=
=
Decimate frames
Decimate fields
Start decimation on the odd field (an odd field is the first field
dropped).
Start decimation on the even field (an even field is the first field
dropped).
4
0
4
1
D829BDSA
3
0
3
0
HDELAY_MSB
DEC_RAT
0x02—Temporal Decimation Register (TDEC)
2
0
2
0
4.0 Control Register Definitions
1
0
1
1
HACTIVE_MSB
0
0
0
0
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