82434LX

Cache and Memory Controller 208Pin QFP

PCI, CACHE AND MEMORY CONTROLLER PCMC

The /82434NX PCI, Cache, Memory Controllers PCMC integrate the cache and main memory DRAM control functions and provide bus control for transfers between the CPU, cache, main memory, and the PCI Local Bus. The cache controller supports write-back or write-through for 82434LX cache policy and cache sizes of 256-KBytes and 512-KBytes. The cache memory can be implemented with either standard or burst SRAMs. The PCMC cache controller integrates a high-performance Tag RAM to reduce system cost.

Supports the PentiumTMProcessor at iCOMPTMIndex 510/60 MHz and iCOMP Index 567T66 MHz

Supports the Pentium Processor at iCOMP Index 735/90 MHz, iCOMP Index 815T100 MHz, and iCOMP Index 610/75 MHz

Supports Pipelined Addressing Capability of the Pentium Processor

The 82430NX Drives 3.3V Signal Levels on the CPU and Cache Interfaces

High Performance CPU/PCI/Memory Interfaces via Posted Write and Read Prefetch Buffers

Fully Synchronous PCI Interface with Full Bus Master Capability

Supports the Pentium Processor Internal Cache in Either Write-Through or Write-Back Mode

Programmable Attribute Map of DOS and BIOS Regions for System Flexibility

Integrated Low Skew Clock Driver for Distributing Host Clock

Integrated Second Level Cache Controller

  Integrated Cache Tag RAM

  Write-Through and Write-Back Cache Modes for the 82434LX

  Write-Back for the 82434NX

  82434NX Supports Low-Power Cache Standby

  Direct Mapped Organization

  Supports Standard and Burst SRAMs

  256-KByte and 512-KByte Sizes

  Cache Hit Cycle of 3-1-1-1 on Reads and Writes Using Burst SRAMs

  Cache Hit Cycle of 3-2-2-2 on Reads and 4-2-2-2 on Writes Using Standard SRAMs