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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. GLPCI 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