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ARCHITECTURAL OVERVIEW

The 82430 PCIset consists of the 82434LX PCMC and 82433LX LBX components plus either a PCI/ISA bridge or a PCI/EISA bridge. The 82430NX PCIset consists of the 82434NX PCMC and 82433NX LBX components plus either a PCI/ISA bridge or a PCI/EISA bridge. The PCMC and LBX provide the core cache and main memory architecture and serves as the Host/PCI bridge. An overview of the PCMC follows the system overview section.

■ Supports the Full 64-bit Pentiumé Processor Data Bus at Frequencies up to 66 MHz (82433LX and 82433NX)

■ Drives 3.3V Signal Levels on the CPU Data and Address Buses (82433NX)

■ Provides a 64-Bit Interface to DRAM and a 32-Bit Interface to PCI

■ Five Integrated Write Posting and Read Prefetch Buffers Increase CPU and PCI Performance

— CPU-to-Memory Posted Write Buffer 4 Qwords Deep

— PCI-to-Memory Posted Write Buffer Two Buffers, 4 Dwords Each

— PCI-to-Memory Read Prefetch Buffer 4 Qwords Deep

— CPU-to-PCI Posted Write Buffer 4 Dwords Deep

— CPU-to-PCI Read Prefetch Buffer 4 Dwords Deep

■ CPU-to-Memory and CPU-to-PCI Write Posting Buffers Accelerate Write Performance

■ Dual-Port Architecture Allows Concurrent Operations on the Host and PCI Buses

■ Operates Synchronously to the CPU and PCI Clocks

■ Supports Burst Read and Writes of Memory from the Host and PCI Buses

■ Sequential CPU Writes to PCI Converted to Zero Wait-State PCI Bursts with Optional TRDYY Connection

■ Byte Parity Support for the Host and Memory Buses

— Optional Parity Generation for Host to Memory Transfers

— Optional Parity Checking for the Secondary Cache

— Parity Checking for Host and PCI Memory Reads

— Parity Generation for PCI to Memory Writes

■ 160-Pin QFP Package