Video Controller; Video Memory; Video Resolutions And Frequencies - NEC POWERMATE P60D Service Manual

1-10 Technical Information

Video Controller

The Cirrus Logic CLDG5434 PCI graphics controller combines powerful elements aimed at
addressing the requirements of personal computer designs. State of the art techniques have
been added for optimizing performance in computer graphic intensive applications and
graphical user interfaces (GUI). A variety of industry standard 32-bit PCI-bus interfaces are
integrated on chip. The key is that PCI-bus interfaces are 32-bit wide.
Included in the video controller are cost saving features such as an integrated palette DAC
and clock synthesizer along with integrated support for multiple bus interfaces and flexible
DRAM-based display memory configurations.
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 CLDG5434
supports up to 2 MB of display memory. The video memory is 256K x 16 DRAM.
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.

Video Memory

The 1 MB of on-board video DRAM is expandable to 2 MB and provides graphic resolu-
tions of or 640 x 480 with 16.8 million colors, 800 x 600 with 64K colors, 1024 x 768 with
256 colors, or 1280 x 1024 with 16 colors. Table Section 1-9 provides the possible resolu-
tions with the installed video memory.
Table Section 1-9 Video Resolutions and Frequencies
Resolution
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
640 x 480
800 x 600
Memory
Required Color
1 MB 256
1 MB 256
1 MB 256
1 MB 65K
1 MB 65K
1 MB 65K
1 MB 16.7M
1 MB 16.7M
1 MB 16.7M
1 MB 256
Video Clock (Hz) Horiz Sync (KHz)
60 31.5
72 37.0
72 44.6
60 31.5
72 37.0
72 44.6
60 31.5
72 37.0
72 44.6
95(i) 33.8