Functional Architecture
Intel® Server Board SE7520AF2 TPS
36
Revision
1.2
Intel order number C77866-003
ACPI 2.0 power management logic support
Enhanced DMA controller, interrupt controller, and timer functions
Integrated IDE controller with support for Ultra ATA100/66/33
Integrated SATA 150 controller
USB host interface with support for eight USB 2.0 ports; via four UHCI host controllers;
and one EHCI high-speed host controller
System Management Bus (SMBus) Specification, Version 2.0 with additional support for
I
2
C devices
Low Pin Count (LPC) interface
Each function within the ICH5-R 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.
3.1.4.1 PCI
Interface
The ICH5-R PCI interface supports a 33 MHz, Revision 2.3 compliant implementation. All PCI
signals are 5-V tolerant, except PME#. The ICH5 integrates a PCI arbiter that supports up to six
external PCI bus masters in addition to the internal ICH5 requests. On the Intel® Server Board
SE7520AF2 this PCI interface is used to support one on-board PCI device: ATI* Rage XL video
controller.
3.1.4.2
IDE Interface (Bus Master Capability and Synchronous DMA Mode)
The ICH5-R has an integrated IDE controller with two independent IDE signal channels
supporting up to four IDE devices although only one is used on the Intel® Server Board
SE7520AF2. This integrated functionality provides the interface for IDE hard disks and ATAPI
devices. Each IDE device can have independent timings. The IDE interface supports PIO IDE
transfers up to 16 MB/sec and Ultra ATA transfers up 100 MB/sec. The IDE interface integrates
16x32-bit buffers for optimal transfers and does not consume any ISA DMA resources. The
ICH5-R’s IDE signal channels can be configured to the standard primary and secondary
channels.
On the Intel® Server Board SE7520AF2 the primary bus is available via the one on-board
legacy IDE connector.
3.1.4.3
Serial ATA (SATA) Host Controller
The SATA Host controller supports two SATA devices providing an interface for SATA hard
disks and ATAPI devices. The SATA interface supports PIO IDE transfers up to 16 MB/s and
Serial ATA transfers up to 1.5 Gb/s (150 MB/s). The SATA system for the ICH5-R contains two
independent SATA signal ports that can be independently electrically isolated. Each SATA
device can have independent timings. They can be configured to the standard primary and
secondary channels. In addition, the ICH5-R offers the Intel® Embedded Server RAID
Technology enabling data striping (RAID Level 0) for higher performance or data mirroring
(RAID Level 1) for fault-tolerance between the two SATA drives alleviating disk bottlenecks by
taking advantage of the dual independent SATA controllers integrated in the ICH5-R.
The Intel® Server Board SE7520AF2 supports both SATA 150 ports via two on-board
connectors for internal hard drives. For details on SATA RAID see section 3.4.6.