AMD SC1200 Computer Hardware User Manual


 
AMD Geode™ SC1200/SC1201 Processor Data Book 141
6
Core Logic Module 32579B
6.0Core 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 SC1200/SC1201 pro-
cessor. This interface 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