Chapter 2. System Board Features
Video Subsystem
The video subsystem on the system board includes the
Cirrus CL-GD5446
chip and up to 2 MB of EDO
DRAM.
Cirrus CL-GD5446 Chip
The CL-GD5446 chip supports all video graphics array (VGA) modes and is compliant with super video
graphics array (SVGA) modes, Video Electronics Standards Association (VESA) 1.2. Some enhanced
features of the chip are:
Plug and Play support
50 nanosecond (ns) single-cycle EDO DRAM support
Advanced Power Management support
Color space conversion
Hardware scaling
The chip is connected to the PCI bus and is PCI 2.1 compliant. The CL-GD5446 video subsystem
supports the VESA Display Data Channel (DDC) standard 1.1 and uses DDC1 and DDC2B to determine
optimal values during automatic monitor detection.
For information on resource assignments, see Appendix B, “System Address Maps” on page 44 and
Appendix C, “IRQ and DMA Channel Assignments” on page 50.
The video subsystem provides a 15-pin monitor port on the system board; For information on connector
pin assignments, see “Monitor Connector” on page 35.
Video Memory
The video memory modules used are 256 KB x 16 (512 KB total) 50 nanosecond (ns) EDO DRAMs.
The maximum amount of video memory that can be used with the video subsystem is 2 MB. Systems are
shipped standard with either two modules that total 1 MB and create a 32-bit data path to video memory
or four modules that total 2 MB and create a 64-bit data path to video memory. For systems with 1 MB of
video memory, an upgrade is available.
8 Technical Information Manual
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