
AMD Geode™ SC2200 Processor Data Book
149
6
Core Logic Module
32580B
6.0
Core Logic Module
The Core Logic module is an enhanced PCI-to-Sub-ISA
bridge (South Bridge), this module is ACPI-compliant, and
provides AT/Sub-ISA functionality. The Core Logic module
also contains state-of-the-art power management. Two bus
mastering IDE controllers are included for support of up to
four ATA-compliant devices. A three-port Universal Serial
Bus (USB) provides high speed, and Plug & Play expan-
sion for a variety of new consumer peripheral devices.
6.1
Feature List
Internal Fast-PCI Interface
The internal Fast-PCI bus interface is used to connect the
Core Logic and GX1 modules of the SC2200. This inter-
face includes the following features:
•
PCI protocol for transfers on Fast-PCI bus
•
Up to 66 MHz operation
•
Subtractive decode handled internally in conjunction
with external PCI bus
Bus Mastering IDE Controllers
•
Two controllers with support for up to four IDE devices
•
Independent timing for master and slave devices for both
channels
•
PCI bus master burst reads and writes
•
Multiword DMA support
•
Programmed I/O (PIO) Modes 0-4 support
Universal Serial Bus
•
Three independent USB interfaces
•
Open Host Controller Interface (OpenHCI) specification
compliant
PCI Interface
•
PCI 2.1 compliant
•
PCI master for AC97 and IDE controllers
•
Subtractive agent for unclaimed transactions
•
Supports PCI initiator-to-Sub-ISA cycle translations
•
PCI-to-Sub-ISA interrupt mapper/translator
•
External PCI bus
— Devices internal to the Core Logic module (IDE,
Audio, USB, Sub-ISA, etc.) cannot master to memory
through the external PCI bus.
— Legacy DMA is not supported to memory located on
external PCI bus.
— The Core Logic module does not transfer subtrac-
tively decoded I/O cycles originating from the
external PCI bus.
AT Compatibility
•
8259A-equivalent interrupt controllers
•
8254-equivalent timer
•
8237-equivalent DMA controllers
•
Port A, B, and NMI logic
•
Positive decode for AT I/O space
Sub-ISA Interface
•
Boot ROM chip select
•
Extended ROM to 16 MB
•
Two general-purpose chip selects
•
NAND Flash support
•
M-Systems DiskOnChip support
•
Is not the subtractive decode agent
Power Management
•
Automated CPU 0V Suspend modulation
•
I/O Traps and Idle Timers for peripheral power manage-
ment
•
Software SMI and Stop Clock for APM support
•
ACPI-compliant timer and register set
•
Up to 22 GPIOs of which all can generate Power
Management Interrupts (PMEs)
•
Three Dedicated GPWIOs powered by V
SBL
and V
SB
•
Shadow register support for legacy controllers for 0V
Suspend
Содержание Geode SC2200
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