
Intel® SRMK2 Internet Server Technical Product Specification
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3.6 SCSI Host bus Interface
The SRMK2 motherboard uses an Adaptec
®
AIC-7899 Ultra 160 SCSI controller for the SCSI
Host bus interface. The AIC provides two independent Ultra 160/m SCSI channels combined with
a full-featured PCI 2.1/2.2-compliant bus master. The AIC-7899 operates at up to 66MHz and
functions as a 64-bit bus master capable of supporting zero wait state 64-bit memory transfers at a
maximum data burst rate of 533 Mbytes/sec. The AIC-7899 SCSI controller complies with the
SCSI-3 standard providing multimode SCSI support for both single -ended (SE) and Low Voltage
Differential (LVD) SCSI peripherals. The SRMK2 motherboard has two SCSI Ultra 160, 68-pin
D-shell connectors, one internal and one external on the rear panel. Both SCSI connectors are
protected from over-current conditions via a separate polyfuse.
3.6.1 SCSI Hard Drive LED Connector (Optional)
The optional SCSI hard drive LED connector is a 1 x 2-pin connector that allows add-in
SCSI controller applications to use the same LED as the IDE controller. This connector
can be connected to the LED output of the add-in controller card (J35 is the designator
number on the motherboard)
3.7 IDE Interface
Through the ServerWorks
®
ServerSet
™
OSB4 South bridge, the serverboard has one independent
bus-mastering IDE interface. This interface supports:
•
ATAPI devices (such as CD-ROM drives)
•
ATA devices
One 40-pin connector is populated on board. The connector at J9 provides the primary IDE
interface (only this one is populated). The BIOS supports logical block addressing (LBA) and
extended cylinder head sector (ECHS) translation modes. The drive reports the transfer rate and
translation mode to the BIOS.
3.8 USB
The serverboard has two USB ports; one USB peripheral can be connected to each port. For
more than two USB devices, an external hub can be connected to either port. The two USB ports
are implemented with stacked back panel I/O connectors. The serverboard fully supports UHCI
and uses UHCI-compatible software drivers. See section 14.2 for information about the USB and
UHCI specifications. (
Note that NT 4.0 does not have USB support
). Additionally, Legacy
USB devices are not supported by the system BIOS. This means that a Legacy USB keyboard
will not be operable during the system POST and you will not be able to enter the system BIOS
with a Legacy USB keyboard because of this restriction. To work around this problem, use a
PS/2 keyboard for changing BIOS settings. This restriction does not affect the use of Legacy
USB keyboards under operating systems that support USB devices.
The SRMK2 USB ports feature:
•
Self-identifying peripherals that can be plugged in while the computer is running
•
Automatic mapping of function to driver and configuration
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