Technical data

Block Diagram
A-9
DIGITAL Server 5220
SCSI Controller
The PCI SCSI controller (SYMC896) interfaces to the Secondary PCI bus to provide
support for the SCSI connectors on the main logic board. The SCSI controller
supports internal Ultra wide SCSI single-ended transactions and external Ultra2 SCSI
transactions.
SCSI Connectors
SCSI connector Channel A interfaces to the storage backplane and an optional SCSI
tape drive. SCSI connector Channel B provides an external connection to the
system box and can accommodate Ultra2 (LVD) devices in an expansion box. Both
connectors have termination on the MLB.
IDE Interface
The main logic board includes the standard IDE interface, connecting to a bootable
32X speed CD-ROM. The PCI IDE interface is controlled by the PCI ISA IDE
Xcelerator (PIIX4). The Primary IDE connector goes to the CD-ROM. The
Secondary IDE connector is available for other IDE options, such as an IDE tape
drive.
Display Interface
Super Video Graphics Array
The Super Video Graphic Array (SVGA) Trio64 V2 family video controller, provided
on the combo Video/Ethernet plug-in module. It uses an S3 VGA graphic user
interface (GUI) accelerator and is 100% register-level compatible with the IBM VGA.
The SVGA provides:
•
Advanced architecture using pipelining, multiple FIFO, and a read-ahead cache
•
Hardware acceleration of 2-D graphics
•
Direct connectivity to 32-bit local bus
•
Full hardware and BIOS support for VESA Display Power Management (DPMS)
protocol to provide standby, suspend, and off power-saving features
•
Fast linear addressing by the CPU for up to 2 MBytes of display memory (256K
x 32, 100 MHz, 7 ns DRAM)