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Functional Architecture
Intel® Server Board SE7520AF2 TPS
30
Revision
1.2
Intel order number C77866-003
3.1 Intel® E7520 Chipset
The architecture of the Intel® Server Board SE7520AF2 is designed around the Intel® E7520
chipset. The chipset used on this board consist of four components which together are
responsible for providing the interface between all major sub-systems found on the baseboard
including the processor, memory, and I/O sub-systems. These components are:
Intel® E7520 Memory Controller Hub (MCH)
Intel® 82801ER I/O Controller Hub (ICH5-R)
Intel® 6700PXH PCI-X Hub (PXH)
Intel® 80332 I/O Processor with Intel® XScale Technology (IOP332)
The following sub-sections provide an overview of the primary functions and supported features
of each chipset component used on the Intel® Server Board SE7520AF2. Later sections in this
chapter provide more detail on how each sub-system is implemented.
Note:
The Intel® 80332 I/O processor emulates a second PXH on the platform. When the Intel®
RAID Activation Key accessory kit and RAID memory are installed, the RAID On Motherboard
(ROMB) function of the I/O processor is enabled to work with the LSI Logic* 53C1030 SCSI
controller to provide RAID functionality.
3.1.1
Memory Controller Hub (MCH)
The MCH is a 1077-ball FC-BGA package which supports the following interfaces:
CPU Front-Side Bus at 200MHz operation using AGTL+ (Assisted Gunner Transceiver
Logic) signaling, 4x 64-bit data bus at 6.4GB/s.
Dual memory channels supporting registered 64-bit data ECC DDR2 400MHz DIMMs
with bandwidth of 3.2GB/s per channel giving a total of 6.4GB/s for both channels.
Three PCI Express* x8 interfaces with aggregate bandwidth of 4.2GB/s each. These
interfaces are distributed as follows:
-
One x8 interface to the PXH
-
One x8 interface enabling PCI Slot 4
-
Third x8 PCI Express* interface is configured as two independent x4 interfaces,
which connect to the IOP332 and PCI Slot 3
1
Hub Interface 1.5, with 8-bit data bus running at 66MHz, resulting in a 266MB/s interface
to the ICH5-R.
RASUM support through memory features including Memory Mirroring and Memory
Sparing.
The following sub-sections will provide an overview describing the primary functions and
supported features of each chipset component as used on the Intel® Server Board SE7520AF2.
Later sections in this chapter provide more detail on how each sub-system is implemented.
1
PCI Slot 3 has a physical x8 PCI Express connector, but it is plumbed with a x4 interface.