AM486 Datasheet | AMD

DESCRIPTION The Am486DX4 microprocessor is a high-performance 486 desktop solution that provides optimal price/performance for high-end 486 power-managed systems. The Am486DX4 CPU offers superior local bus graphics performance for Microsoft® Windows®. Using AMD’s speed-multiplying technology, the Am486DX4 CPU and cache operate two to three times faster than the external memory bus. It is manufactured using AMD’s new 3.3-V CMOS process technology to consume about 2.6 watts of power at 100 MHz or 3.2 watts at 120 MHz. This 3.3-V technology provides superior solutions for low-power EPA’s Energy Star Green PCs and portables. The Am486DX4 processor operates with a 1X clock input. This 1X clock simplifies system design by reducing the clock frequency required by external devices. The 1X clock also reduces RF emission and simplifies clock generation. The input signal is doubled or tripled internally to achieve the maximum 2X or 3X operating frequency. The phases of the core clock are controlled by an internal Phase Lock Loop (PLL) circuit. This document contains information on a product under development at Advanced Micro Devices. The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Publication#19160 Rev: D Amendment/0 Issue Date: July 1995 BLOCK DIAGRAM PRELIMINARY Am486 CPU Pipelined 32-Bit Microarchitecture 64-Bit Interunit Transfer Bus 32-Bit Data Bus 32-Bit Data Bus Base/ Barrel Shifter Index Bus Register File Segmentation Unit Descriptor Registers Limit and Attribute Linear Address Bus 32 PCD, PWT Paging Unit Cache Unit Translation Lookaside Buffer Physical Address 8-Kbyte...