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User’s Manual
14 ECB-870 User’s Manual
3.6.1 SiS 315 4X AGP VGA Controller
With a 529-pin PBGA package, SiS315 integrates a 4X/2X AGP controller with full
sideband or pipeline support, a 256-bit 3D/2D graphics engine and a motion
compensation MPEG I/MPEG II accelerator. It offers a complete 128-bit SDR/DDR
memory data bus. Embedded with a 128-bit 2D engine, it can achieve ultra high 2D
performance with the maximum memory bandwidth up to 5.3 GB/s. An optimized 3D
pipeline architecture is implemented for eliminating the overhead resulted from texture
read, Z-buffer read/write and destination read latencies and achieving a sustain
throughput of over 90% of peak throughput even when texture, Z buffer and alpha
blending functions are all enabled. SiS315 also includes a video accelerator and a high
performance DVD motion compensation logic to provide very smooth DVD playback.
SiS315 provides 12-bit DDR (dual data rate) or single 24-bit SDR digital interface to
support secondary display, which is independent of primary CRT display. The digital video
interface can also support different TV encoders or LCD transmitters offered by the third
party vendors.
SiS315 support the following display modes:
Supports 375MHz pixel clock
Supports VESA standard super high resolution graphics modes
640x480 16/256/64K/16M colors 85 Hz NI
800x600 16/256/64K/16M colors 85 Hz NI
1024x768 256/64K/16M colors 85 Hz NI
1280x1024 256/64K/16M colors 85 Hz NI
1600x1200 256/64K/16M colors 85Hz NI
1920x1440 256/64K/16M colors 85Hz NI
2048x1536 256/64K/16M colors 85Hz NI
low resolution modes (hidden)
Supports virtual screen up to 4096x4096