566 AMD Geode™ LX Processors Data Book
GeodeLink™ PCI Bridge
33234H
6.15 GeodeLink™ PCI Bridge
The GeodeLink™ PCI Bridge (GLPCI) module provides a
PCI interface for GeodeLink Interface Unit-based designs.
The GLPCI module is composed of five major blocks:
•GeodeLink Interface
•FIFO/Synchronization
•Transaction Forwarding
•PCI Bus Interface
•PCI Arbiter
The GeodeLink and PCI Bus Interface blocks provide
adaptation to the respective buses. The Transaction For-
warding block provides bridging logic.
Features
•PCI Version 2.2 compliance
•32-bit, 66 MHz PCI bus operation
•Target support for fast back-to-back transactions
•Arbiter support for three external PCI bus masters
•Write gathering and write posting for in-bound write
requests
•Virtual PCI header support
•Delayed transactions for in-bound read requests
•Zero wait state operation within a PCI burst
•Dynamic clock stop/start support for GLIU and PCI clock
domains (this is not CLKRUN support)
•Capable of handling out of bound transactions immedi-
ately after reset

Figure 6-58. GL PCI Block Diagram

PCI Bus Interface
PCI Bus
RequestRequest Data
PCI
Arbiter
REQ#/GNT#
MSR Transaction Forwarding
FIFOs/Synchronization
GeodeLink™ Interface
GeodeLink™ Interface Unit 1 (GLIU1)
Clock Control
Clock Control
Clock Control