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Baseboard Description 19
The table below summarizes typical LED states that you may encounter during a system’s
operation.
Table 3. Slot State Indicators
LED State Status
Green On
Amber Off
The slot is on and functioning normally.
Green On
Amber On
The slot is on and the card requires attention.
Green Off
Amber On
The slot is off and the card in the slot requires attention.
Green blinking
Amber Off
Slot power is transition from either ON to OFF or OFF to ON.
Off The slot is powered off.
PCI features include:
• 33 or 66 MHz bus speed
• 32-bit or 64-bit memory addressing
• 3.3V or 5V signaling environment
• Independent bus structure supports transfers up to 1.2 GB/sec
• 8-, 16-, 32-, or 64-bit data transfers
• Plug and Play ready
• Parity enabled
DesotoE2 Hot-Plug PCI Controller
The DesotoE2 Hot-Plug PCI controller is a 32-bit PCI bus agent that operates at either 33 or
66 MHz. The PCI controller manages PHP functionality for the PCI segment it resides on. There
is a DesotoE2 controller on PCI segments A and B. The DesotoE2 PHP controller is:
• ACPI compliant
• Compatible with Compaq’s
†
PHP controller design
• Supports either a 3.3 V or 5 V PCI bus
The DesotoE2 is responsible for:
• Managing power application and removal to individual slots
• Properly resetting newly-added PCI boards prior to bringing the board online
• Managing connection and disconnection of the PCI signals between the P CI bus and the add-
in board
• Managing seamless addition and removal of individual PCI add-in boards without impacting
bus functionality
IDE Interface
The Open South Bridge (OSB4) acts as a PCI-based fast IDE controller. The controller supports
programmed I/O and bus master transfers. While the OSB4 supports two IDE channels, the SKA4
baseboard uses only the primary IDE channel and provides a single 40 pin IDE connector.