STV3550B STMicroelectronics, STV3550B Datasheet - Page 57

• Manufacturer Part Number: STV3550B
• Manufacturer: STMicroelectronics

Specifications of STV3550B

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

STV3550
4.4.1
4.4.2
4.4.3
4.4.4
The picture compositor is a real-time multilayer (or multiplane) digital mixer. It can compose
a single output stream from up to four sources:
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Background color plane
The background color is stored in a 24-bit RGB register that acts as a full-screen plane filled
with a solid color. This plane is always opaque with no alpha value associated. It will be
seen on each screen location, according to the resulting transparency of all the foreground
planes.
This plane, associated with the video plane and its mixing factor, can perform a contrast
function used to adjust the contrast of the video plane, independently of the OSD plane.
Video plane
The video display pipeline provides a video stream that can be resized and pre-processed
on the video input port. The video plane has the following characteristics:
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Cursor plane
The curser plane is defined as a 128 x 128 pixel area stored in an external memory chip.
Each cursor entry is an ARGB4444 pixel. The alpha factor of 4-bits is for antialiasing the
cursor pattern on top of the composited output picture.
List of features :
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Graphics plane
List of features :
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The table below summarizes the various source formats for each GAMMA picture
compositor plane.
Background color plane (programmable register)
Video plane (D1 input, once captured into the local memory)
Cursor plane
On-screen display (OSD) and graphics (GFX) plane
YCbCr 4:4:4 format with 10-components
SD format compatible
Single viewport mechanism with a global alpha value
Color space conversion matrix (YCbCr 601 to RGB)
ACLUT8 format with ARGB4444 CLUT entries
Size is programmable up to 128 x 128
Hardware rectangular clipping window, out of which the cursor is never displayed (per-
pixel clipping, so only part of the cursor can be out of this window, and consequently
transparent)
Current bitmap is specified using a pointer register to an external memory location,
making cursor animation very easy
Programmable pitch, so that all cursor patterns can be stored in a single global bitmap
On-screen display and graphics data arrives in ARGB 8:10:10:10 format
Gain and offset adjustment
Graphics functional description
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