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Revision 1.1

Architecture Overview (Continued)

1.1

GX1 MODULE

The GX1 module (based upon silicon revision 8.1.1) is the

central module of the SC1100. For detailed information

regarding the GX1 module, refer to the Geode GX1 Pro-

cessor Series datasheet and the Geode GX1 Processor

Series Silicon Revision 8.1.1 errata. The Geode GX1 mod-

ule represents the sixth generation of x86-compatible 32-

bit processors with sixth-generation features. The decou-

pled load/store unit allows reordering of load/store traffic to

achieve higher performance. Other features include single-

cycle execution, single-cycle instruction decode, 16 KB

write-back cache, and clock rates up to 300 MHz. These

features are made possible by the use of advanced-pro-

cess technologies and pipelining.

The GX1 module has low power consumption at all clock

frequencies. Where additional power savings are required,

designers can make use of Suspend Mode, Stop Clock

capability, and System Management Mode (SMM).

The GX1 module is divided into major functional blocks (as

shown in Figure 1-2):

• Integer Unit

• Floating Point Unit (FPU)

• Write-Back Cache Unit

• Memory Management Unit (MMU)

• Internal Bus Interface Unit

• Integrated Functions

Instructions are executed in the integer unit and in the float-

ing point unit. The cache unit stores the most recently used

data and instructions and provides fast access to this infor-

mation for the integer and floating point units.

Figure 1-2. Internal Block Diagram

Write-Back

Unit

FPU

Internal Bus Interface Unit

Memory

PCI

SDRAM Port

Fast-PCI Bus

Integer

Cache Unit

Integrated

Functions

MMU

X-Bus

Controller

C-Bus

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