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== Overview ==
== Overview ==
'''32-bit Sony GPU (designed by Toshiba)'''
* Handles display of graphics, control of framebuffer, and drawing of polygons and textures
* Handles 2D graphics processing, in a similar manner to the 3D engine
* RAM:
** 1 MB VRAM (later models used SGRAM) for framebuffer
** 2 KB texture cache (132 MB/s memory bus bandwidth, 32-bit wide)
** 64 bytes FIFO buffer
* Features:
** Adjustable framebuffer (1024×512)
** Emulation of simultaneous backgrounds (to simulate parallax scrolling)
** Mask bit
** Texture window
** Dithering
** Clipping
** Alpha blending (4 per-texel alpha blending modes)
** Fog
** Framebuffer effects
** Transparency effects
** Render to texture
** Offscreen rendering
** Multipass rendering
** Flat or Gouraud shading and texture mapping
** No line restriction
** Colored light sourcing
* Resolutions:
** Progressive: 256×224 to 640×240 pixels
** Interlaced: 256×448 to 640×480 pixels
* Colors:
** Maximum color depth of 16,777,216 colors (24-bit true color)
** 57,344 (256×224) to 153,600 (640×240) colors on screen
** Unlimited color lookup tables (CLUTs)
** 32 levels of transparency
** All calculations are performed to 24 bit accuracy
* Texture mapping color mode:
** Mode 4: 4-bit CLUT (16 colors)
** Mode 8: 8-bit CLUT (256 colors)
** Mode 15: 15-bit direct (32,768 colors)
** Mode 24: 24-bit (16,777,216 colors)
* Sprite engine:
** 1024×512 framebuffer, 8×8 and 16×16 sprite sizes, bitmap objects
** Up to 4,000 sprites on screen (at 8×8 sprite size), scaling and rotation
** 256×256 maximum sprite size
* Special sprite effects:
** Rotation
** Scaling up/down
** Warping
** Transparency
** Fading
** Priority
** Vertical and horizontal line scroll


== Revisions ==
== Revisions ==
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** Some performance improvements
** Some performance improvements
* CXD8561AQ
* CXD8561AQ
** Found on some PU-20 and some PU-22
** Found on some PU-20
* CXD8561BQ
* CXD8561BQ
** Found on PU-16, PU-18 and some PU-20
** Found on some PU-18 and PU-20
** Die size: 54 mm²
* CXD8561CQ
* CXD8561CQ
** Found on some PU-20, some PU-22, PU-23 and PM-41 (until -51)
** Found on some PU-22, PU-23 and PM-41 (until -51)
** Die size: 54 mm² (thus not shrunk compared to the previous revision)


=== CXD9500 ===
=== CXD9500 ===
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