NEC PowerMate 466M, Руководство по обслуживанию

Страница: 24 / 184

Technical Information 1-11
The 64300 video controller supports XRAM Accelerator Cache, power management, flash
ROM, and a linearly mapped display.
The XRAM Accelerator Cache is a breakthrough in performance technology. By using one
standard 256K x 4 fast page DRAM, a proprietary algorithm implemented in the 64300 sig-
nificantly increases graphics system performance. Performance never before achieved in
standard dram-based graphics architectures.
When using the 64300 Wingine DGX, a system host CPU’s performance is enhanced and a
significant improvement will be observed in the display. Other DRAM-based graphics accel-
erators gain some degree of performance which, while measurable, is not as significant nor
as noticeable on the display.
The TrueColor RAMDAC provides 24-bit true color. The integrated dual clock synthesizer
allows full programmability of MCLK (memory clock) and PCLK (pixel clock). The inte-
grated clock synthesizer supports frequencies from 390 kHz to 120 MHz. The 64300 sup-
ports up to 2 MB of display memory. The video memory is 256K x 16 Fast Page Mode
DRAM. Display memory is linearly mapped up to 2 MB.
The VESA display power management signaling (DPMS) standard is supported, enabling
stand-by, suspend, and off power saving modes. This includes the ability to independently
stop HSYNC of VSYNC and hold them at a static level. Additionally the RAMDAC may
be powered-down and the clock frequencies lowered for further power savings. Color Key
and video overlay are supported.