STV2310D STMicroelectronics, STV2310D Datasheet - Page 24

• Manufacturer Part Number: STV2310D
• Description: Video ICs Digital Video Decodr
• Manufacturer: STMicroelectronics
• Type: High Quality front end videor

Specifications of STV2310D

• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-64
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
24/113
4.8
4.8.1
4.8.2
Note:
Soft Mixer
General Description
The Soft Mixer is used to mix the Y, Cr and Cb data flows (respectively) from the CVBS source and
the RGB Insertion block. The mixing of the data flows is controlled by Fast Blanking mode. A forced
CVBS or RGB flow mode can also be programmed. In this case, the mixer acts as a multiplexer. A
static mixing (also called alpha blending) mode is also programmable.
When the normal mixing mode is programmed, the CVBS and RGB flows are blending according to
the Fast Blanking (FB) signal. The FB signal is sampled with subpixel accuracy to ensure correct
mixing. The mixing slope between flows is programmable.
Programming
Fast Blanking mode is selected by the FBLANKMODE[2:0] bits in the
The FBLANKMODE value is only applied when the STV2310 is not in Analog YCrCb mode
The soft mixing slope or the Alpha Blending value, depending on the Fast Blanking mode, is set in
the MIX_SLOPE[7:0] bits in the
or Forced CVBS mode, this value is ignored.
Bit Value
00x
01x
100
101
110
111
Phase Correction (cϕ)
Figure 13: Phase Correction when Automatic Flesh Control Enabled
+10
Normal Mixing mode
Dynamic Mixer mode
Static Mixer or Alpha
Blending 1 mode
Static Mixer or Alpha
Blending 2 mode
Forced CVBS mode
Forced RGB mode
-10
ϕ
Mixing Mode
0
- 39.4°
ϕ
0
- 29.5°
DDECCONT6
Table 9: Fast Blanking Modes
ϕ
0
FB active during active line. Soft Mixing between 0 and 1. (Default mode)
FB active and Soft Mixing from 0 to MIXSLOPE[7:0]
FB inactive. Y
with alpha = MIXSLOPE[7:0] (same for Cr and Cb signals)
FB inactive. Y
with alpha = MIXSLOPE[7:0] (same for Cr and Cb signals)
FB inactive. Y
FB inactive. Y
ϕ
0
+ 29.5°
register. When the blanking mode is in Forced RGB
ϕ
OUT
OUT
OUT
OUT
0
= 123° or 117°
ϕ
= alpha x Y
= alpha x Y
= Y
= Y
0
+ 39.4°
CVBS
RGB
(same for Cr and Cb signals)
(same for Cr and Cb signals)
CVBS
RGB
Description
Input Subcarrier Phase
(degrees)
+ (1- alpha) x Y
+ (1-alpha) x Y
DDECCONT5
CVBS
RGB
register.
STV2310