82433NX

Two 82433LX or 82433NX Local Bus Accelerator (LBX) components provide a 64-bit data path between the host CPUCache and main memory a 32-bit data path between the host CPU bus and PCI Local Bus and a 32-bit data path between the PCI Local Bus and main memory The dual-port architecture allows concurrent operations on the host and PCI Buses The LBXs incorporate three write posting buffers and two read prefetch buffers to increase CPU and PCI performance The 82433LX or 82433NX LBX supports byte parity for the host and main memory buses The 82433NX is intended to be used with the 82434NX PCICacheMemory Controller (PCMC) The 82433LX is intended to be used with the 82434LX PCMC During bus operations between the host main memory and PCI the PCMC commands the LBXs to perform functions such as latching address and data merging data and enabling output buffers Together these three components form a ''Host Bridge'' that provides a full function dual-port data path interface linking the host CPU and PCI bus to main memory

This document describes both the 82433LX and 82433NX Shaded areas like this one describe the 82433NX operations that differ from the 82433LX