A6850 Datasheet, PDF (1/15 Pages) Altera Corporation – Asynchronous Communications Interface Adapter

September 1996, ver. 1
a6850
®
Asynchronous Communications
Interface Adapter
Data Sheet
Features
General
Description
s a6850 MegaCore function implementing an asychronous
communications interface adapter (ACIA)
s Optimized for FLEX^® and MAX^® architectures
s Programmable word lengths, stop bits, and parity
s Offers divide-by-1, -16, or -64 mode
s Includes error detection
s Uses approximately 237 FLEX logic elements (LEs)
s Functionally based on the Motorola MC6850 device, except as noted
in the “Variations & Clarifications” section on page 94
The a6850 MegaCore function implements an ACIA, which is a universal
asynchronous receiver/transmitter (UART). The a6850 provides an
interface between a microprocessor and a serial communications channel.
The a6850 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. See Figure 1.
Figure 1. a6850 Symbol
nCTS
A6850
nDCD
E
nRESET
nIRQ
RS
nRTS
RnW
TXDATA
RXCLK
DO[7..0]
RXDATA
TXCLK
CS[2..0]
DI[7..0]
Altera Corporation
81
A-DS-A6850-01