STA1080 datasheet(18/127 Pages) STMICROELECTRONICS

18 / 127 page

System description

STA108x, STA109x

18/127

DS13319 Rev 2

2.14

Video input port (VIP) - Only available in STA109x

The Video Input Port (VIP) allows to grab images from external devices, supporting parallel

CCIR-656 interface up to 54 MHz. Both embedded synchronization and external

synchronization are supported. VIP supports both interlaced or progressive mode.

The VIP is synchronized with display controller to prevent from tearing effects, and is used

in conjunction with SGA to implement the fly YUV → RGB color conversion and bilinear

interpolated re-scaling.

2.15

Smart graphics accelerator (SGA) - Only available in

STA109x

The aim of the Smart Graphic Accelerator (SGA) is to provide an efficient 2D and 3D

primitive drawing tool that offloads the CPU, reducing MIPS and power consumption for

pixel processing.



Control and synchronization:

–

Instruction Automatic Fetch from a program file

–

Flow Control: goto/gosub/wait/interrupt instructions

–

Can synchronize itself on external hardware triggers



2D-Graphic features:

–

2D Rendering Speed: up to 208 MPixel/s

–

Pixel, Line, Filled Triangle, Filled Rectangle primitives

–

Line-Stippling, Filling Pattern

–

Flat and Gradient colour fill (in triangle & rectangles)



Video overlay features:

–

BitBlitting on Rectangle, Triangle shapes

–

Image Resizing (Bilinear Interpolation Filter or Sub/OverSampling)

–

Image Rotation (with any angle)

–

Colour Conversion (YUV-to-RGB or RGB-to-YUV, 16-235 clamping possible)

–

Transparency extraction (exact Colour Keying or Colour Cube (triple interval)

–

Colour Swap with Colour Keying

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AlphaBlending of 3 sources to a destination, ROP boolean operations

–

Dithering operator



3D features:

–

3D Rendering Speed: up to 52 MFragment/s, impacted by memory access delays

–

FrameBuffer and DepthBuffer Cache: 256 Bytes, Fully Associative

–

Texture Cache: 2 kBytes, 4 associative ways

–

Early Z-Test (lowers texture calls)

–

16-bit Z-Buffering

–

Double Texture Blending Units

–

Texture Perspective Correction

–

Texture Nearest and Bilinear Filtering

–

Texture MipMap selection on a Per-Triangle basis

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