132 Chapter5
Block Diagram
System Board and PCI Board
System Management Component
The System Management chip includes the following functions and internal hardware:
Functions
• Hardware semaphore support
• Software reset control
• Serial Presence Detect (SPD) bus
• Fan control
• Power switch monitoring
• Power supply on/off control
• Remote power on/off control.
Hardware
• ASCI
• Front panel display interface
• Flash memory (2 MB)
• Non-volatile storage (128 KB)
• Scratch RAM (128 KB)
• Miscellaneous Memory and I/O Controller Registers
• LDB port
• PIC for remote power on/off control.
Core I/O Subsystem
The core I/O devices are on a PCI 1x bus (5V, 33 MHz) provided by one PCI bridge chip.
Graphics is not be included within the core I/O functionality. Core I/O functions include:
• LAN 10/100 BaseT (DEC programming model)
• Wide Ultra2 SCSI (Low Voltage Differential)
• ATAPI interface for CD-ROM
• Universal Serial Bus (USB). Two ports are supplied, one each for a keyboard and
mouse.
• Two serial ports (based on 16550 model). One serial port supports remote power on/off.
• Parallel port (IEEE 1284)
• Real-time clock (compatible with DS1287 and MC176818 models).
A PCI-based Super I/O chip will be used to supply the USB, serial, parallel and real-time
clock functions.
A Symbios SCSI controller chip will supply the LVD Ultra2 SCSI bus.
Audio will be provided by an optional add-in PCI card. The audio features supported are
based on a simple business class audio model.
The 10/100 BaseT LAN interface is provided via a Digital Semiconductor PCI based MAC
chip.
To Next Page
Loading...
Need help?
General