I/O Board - Intel SR870BN4 - Server Platform - 0 MB RAM Product Manual

reports memory size and allocation to the system through configuration
registers.

I/O Board

The I/O board is installed horizontally in the I/O bay. The I/O riser card plugs into a connector on
the I/O board. The I/O provides the following features:
Intel E8870 chip set with Scalability Port system interface
Six functionally independent Peripheral Component Interconnect (PCI) bus segments
Three hot-plug 133-MHz, 64-bit PCI-X slots
Five hot-plug 100-MHz, 64-bit PCI-X slots
Integrated dual channel LSI 53C1030 Ultra320 Low Voltage Differential SCSI (LVDS)
controller
I/O riser support connector for I/O interface
On-board power conversion from 48 V bulk power
System reset and clock generation circuits
I2C server management interface
Redundant hot-plug system fan interface
I/O Riser
To conserve space on the I/O board, most system I/O and server management functions have been
placed on the I/O riser card that plugs into the I/O board. The I/O connectors include video, serial,
Local Area Network (LAN), and Universal Serial Bus (USB). The I/O riser:
Contains an IDE bus controller and connector. The IDE bus is routed to the I/O board where it
is further routed to the midplane board's disk bay connector.
Converts 12 V STDBY (standby) to +5 V STDBY and +3.3 V STDBY and supplies them to
the I/O board.
Mates directly onto the I/O board and together they contain all of the I/O interfaces for the
board set.
38 Intel® SR870BN4 Server System Product Guide