bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 105

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

Bt829B
VideoStream II Decoders
OES
0x13—Vertical Scaling Register, Upper Byte (VSCALE_HI)
This control register may be written to or read by the MPU at any time. Upon reset, it is initialized to 0x60. An
asterisk indicates the default option.
YCOMB
COMB
INT
VSCALE_HI
YCOMB
7
0
OES[1] and OES[0] control the output three-states when the OE pin or the OUTEN bit
(VPOLE bit 7) is asserted. The pins are divided into three groups: timing (HRESET, VRESET,
ACTIVE, VACTIVE, CBFLAG, DVALID, and FIELD), clocks (CLKx1, CLKx2 and QCLK),
and data (VD[15:0]). CCVALID cannot output three-states.
Luma Comb Enable—When enabled, the luma comb filter performs a weighted average on
two, three, four, or five lines of luminance data. The coefficients used for the average are fixed
and no interpolation is performed. The number of lines used for the luma comb filter is deter-
mined by the VFILT bits in the VTC register. When disabled by a logical 0, filtering and full
vertical interpolation is performed based upon the value programmed into the VSCALE regis-
ter. The LUMA comb filter cannot be enabled on the Bt827A.
Chroma Comb Enable—This bit determines whether the chroma comb is included in the data
path. If enabled, a full line store is used to average adjacent lines of color information. This
reduces cross-color artifacts.
Interlace—This bit is programmed to indicate whether the incoming video is interlaced or non-
interlaced. For example, when using the full frame as input for vertical scaling, this bit should
be programmed high. If using a single field for vertical scaling, this bit should be programmed
low. Single field scaling is normally used when scaling below CIF resolution and when output-
ting to a non-interlaced monitor. Using a single field reduces motion artifacts.
Vertical Scaling Ratio—These five bits represent the most significant portion of the 13-bit ver-
tical scaling ratio register. Care must be taken to avoid altering the contents of the LINE,
COMB, and INT bits when adjusting the scaling ratio.
COMB
6
1
INT
5
1
00
01
10
11
0*
1
0
1*
0
1*
=
=
=
=
=
=
=
=
=
=
Three-state timing and data only
Three-state data only
Three-state timing, data and clocks
Three-state clocks and data only
Vertical low-pass filtering and vertical interpolation
Vertical low-pass filtering only
Chroma comb disabled
Chroma comb enabled
Non-interlace VS
Interlace VS
4
0
D829BDSA
0x13—Vertical Scaling Register, Upper Byte (VSCALE_HI)
3
0
VSCALE_HI
2
0
4.0 Control Register Definitions
1
0
0
0
95