Intel SDS2 manual CSB5 South Bridge PCI-to-LPC Bridge, IDE, USB, NIC Connector and Status LEDs

I/O Subsystem Intel® Server Board SDS2

4.4.1NIC Connector and Status LEDs

The 82550 drives LEDs on the network interface connector to indicate link/activity on the LAN and 10-Mbps or 100-Mbps operation.

∙The green LED indicates a network connection when lighted solidly and TX/RX activity when blinking.

∙The amber LED indicates 100-Mbps a network connection when lighted solidly and TX/RX activity when blinking.

4.5CSB5 South Bridge (PCI-to-LPC Bridge, IDE, USB)

The CSB5 is a multi-function PCI device, housed in a 256-pin BGA device, providing PCI-to-LPC bridge, PCI IDE interface, PCI USB controller, and power management controller. Each function within the CSB5 has its own set of configuration registers. Once configured, each appears to the system as a distinct hardware controller sharing the same PCI bus interface.

In the SDS2 Server Board implementation, the primary role of the CSB5’ is to provide the gateway to all PC-compatible I/O devices and features. The SDS2 uses the following CSB5 features:

∙PCI bus interface

∙LPC bus interface

∙IDE interface, with Ultra DMA 100 capability

∙Universal Serial Bus (USB) interface

∙PC-compatible timer/counter and DMA controllers

∙APIC and 8259 interrupt controller

∙Power management

∙General purpose I/O

Following are descriptions of how each supported feature is implemented in SDS2.

4.5.1PCI Bus Interface

The CSB5 fully implements a 32-bit PCI master/slave interface, in accordance with the PCI Local Bus Specification, Revision 2.2. On the SDS2 Server Board, the PCI interface operates at 33 MHz, using the 5 V signaling environment.

4.5.2PCI Bus Master IDE Interface

The CSB5 acts as a PCI-based Fast IDE controller that supports programmed I/O transfers and bus master IDE transfers. The CSB5 supports two IDE channels, supporting two drives each (drives 0 and 1). The FAB 5 (PBA A58285-502) SDS2 Server Board supports two IDE channels through the standard 40-pin (2x20) connector. Note FAB 4 boards (PBA A58285-402 and –403) supported only one IDE channel.

The SDS2 IDE interface supports the following features:

16	Revision 1.2
Order Number:	A85874-002