Intel
®
E7520 Memory Controller Hub (MCH) Datasheet 21
Introduction
• Memory mirroring allows for two copies of all data in the memory subsystem (one on each
channel) to be maintained.
• DIMM sparing allows for one DIMM per channel to be held in reserve and brought on-line if
another DIMM in the channel becomes defective. DIMM sparing and memory mirroring are
mutually exclusive of one another.
• Hardware periodic memory scrubbing, including demand scrub support.
• Retry on uncorrectable memory errors.
• x4 SDDC for memory error detection and correction of any number of bit failures in a single
x4 memory device.
1.3.3 PCI Express*
The MCH is compatible with the new PCI Express Interface Specification, Rev 1.0a. The MCH
provides three configurable x8 PCI Express* interfaces each with a max theoretical bandwidth of 4
GB/s. These x8 PCI Express interfaces may alternatively be configured as two independent x4 PCI
Express interfaces. The MCH supports PCI Express Hot-Swap on Device 4 (Port B in x8 mode,
Port B0 in x4 mode) and Device 6 (Port C in x8 mode, Port C0 in x4 mode).
The MCH is a root class component as defined in the PCI Express Interface Specification, Rev
1.0a. In addition to the 6700PXH detailed below, the PCI Express interfaces support connection of
the MCH to a variety of other bridges compatible with PCI Express Interface Specification, Rev
1.0a. Other compatible PCI Express devices, available from Intel and/or third-party vendors,
implement functionality such as graphics, H/W RAID controllers and TCP/IP off load engines.
1.3.4 Hub Interface 1.5
The MCH interfaces with the Intel
®
82801ER I/O Controller Hub 5 R or the Intel
®
6300ESB ICH
via a dedicated Hub Interface 1.5 supporting a peak bandwidth of 266 MB/s using a x4 base clock
of 66 MHz. Throughout this document, they both will be routinely referred to as “ICH”.
1.3.4.1 Intel
®
82801ER I/O Controller Hub 5 R (ICH5R)
The ICH5R provides legacy function support similar to that of previous ICH family devices, but
with extensions in RAID 0 support, Serial-ATA technology, and an integrated ASF controller. The
ICH5R also includes integrated USB 2.0 and USB Classic support, ATA-100 IDE support,
integrated 10/100 Ethernet, an LPC interface, a system management interface, a power
management interface, integrated IOxAPIC and 8259 interrupt controllers, and a 32-bit/33 MHz
PCI bus interface. The ICH5R also includes desktop features such as an integrated 20-bit audio.
1.3.4.2 Intel
®
6300ESB ICH
The 6300ESB ICH provides legacy function support similar to that of previous ICH-family
devices, but with extensions in Serial-ATA technology and 64-bit/66MHz PCI-X support. The
6300ESB ICH also includes integrated USB 2.0 and USB Classic support, Ultra ATA/100 IDE
support, an LPC interface, a system management interface, a power management interface,
integrated IOxAPIC and 8259 interrupt controllers, and an integrated DMA controller. The
6300ESB ICH also includes desktop features such as integrated 20-bit audio.
