EP80579 Datasheet, PDF (257/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
9.2.1
Supported PCI Express Configurations
CMI PCI Express ports are setup using a configuration register. This register is
“DEVPRES” BDF 000, Offset 9Ch, Bits 2 and 3 which control Device 2 and Device 3
present.
Table 9-1 shows all of the valid combinations of this register.
Table 9-1. Supported PCI Express Configurations
DEV2 En,
DEV3 En
DEV2 En,
DEV3 Dis
DEVPRES
DEV2 Dis,
DEV3 En
DEV2 Dis,
DEV3 Dis
Strap
AUTO Negotiate
1x8,
2x4,
lower 1x4,
upper 1x4
2x4
2x4
1x8,
lower 1x4
lower 1x4
Not supported
All Disabled
upper 1x4
All Disabled
1x8
1x8
1x8
Not supported
All Disabled
9.2.1.1
9.3
9.4
9.4.1
Low power SKU with PCI Express ports removed
To enable low power SKU for configurations that do not utilize the PCI Express ports,
the user can disable PCI Express ports and configuration bits for power savings.
Supported Debug and Management Interfaces
The IMCH supports a target SMBus interface for access and control of the IMCH
through its configuration registers. A Test Access Port (TAP) interface is also supported
for IMCH system debug purposes. The TAP is capable of full read/write access to the
entire internal IMCH register space.
Platforms based on CMI may also make use of the Inter-Chassis Management Bus
(ICMB) architecture to extend SMBus based management throughout a desegregate
multi-chassis platform solution.
Supported IMCH Integrated Features
This section provides a brief overview of internal IMCH features. The subsections are
intended for use as an introduction and a quick reference. See Section 9.5 for more
detailed descriptions of these features.
EDMA Controller
The IMCH includes an integrated four-channel Enhanced Direct Memory Access (EDMA)
controller to perform background data transfers between locations in main memory, or
from main memory to a memory-mapped I/O destination. These transfers may be
August 2009
Order Number: 320066-003US
Intel^® EP80579 Integrated Processor Product Line Datasheet
257