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8251 Serial Communication Unit (UART and Sync Communication)
General Introduction

Introduction 8251 is an Programmable Serial Communication Controller (PIC) that originally designed to work with 8085/8086/8088 Microprosessors. the Chip combine support of Syncronius and Asyncronuis communication. the 8251 connected with 8086 CPU using Read\Write Logic Pins ( RD_N, WR_N ) and Data BUS	8251 Pins Scematics
Pins Discription ● Data BUS Lane (D 0-7) connected to the Data BUS of 8086 System ● Read\Write Logic Control Pins -       WR_N and RD_N connect to CPU WR_N and ED_N       CS used to disable enable the Controller       C_D_N connected to Address BUS.	High Level Disgram Example of 8251 VHDL Entity (with connect of pins)

Integration with 8086 CPU in a Computer system