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A8251

Programmable Communications Interface

Altera Corporation 

June 1997, ver. 2

Features

General

Description

a8251

®

Programmable Communications

Interface

Data Sheet

s a8251 MegaCore function that provides an interface between a

microprocessor and a serial communication channel

s Optimized for FLEX® architecture

s Programmable word length, stop bits, and parity

s Offers divide-by-1, -16, or -64 mode

s Supports synchronous and asynchronous operation

s Uses approximately 528 FLEX logic elements (LEs)

s Includes:

– Error detection

– False start bit detection

– Automatic break detection

– Internal and external sync character detection

s Functionally based on the Intel M8251A device, except as noted in the

“Variations & Clarifications” on page 44

The a8251 MegaCore function provides an interface between a

microprocessor and a serial communications channel. The a8251 receives

and transmits data in a variety of configurations including 7- or 8-bit data

words, with odd, even, or no parity, and 1 or 2 stop bits. The transmitter

and receiver can be designed for synchronous or asynchronous operation.

See Figure 1.

Figure 1. a8251 Symbol

A8251

CLK

CnD

DIN[7..0]

EXTSYNCD

nCS

nCTS

nDSR

nRD

nRXC

nTXC

nWR

RESET

RXD

DOUT[7..0]

nDTR

nEN

nRTS

RXRDY

SYN_BRK

TXD

TXEMPTY

TXRDY

Altera Corporation

25

A-DS-A8251-2

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