A8251 Ver la hoja de datos (PDF) - Altera Corporation

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A8251

Programmable Communications Interface

Altera Corporation 

a8251 Programmable Communications Interface Data Sheet

Table 1. a8251 Ports (Part 2 of 2)

Name

txd

txempty

txrdy

Type

Output

Output

Output

Polarity

Description

–

High

High

Transmit data. Serial output to modem or peripheral.

Transmitter empty. Indicates that the transmitter logic has no more data to

send.

Transmitter ready. When the txrdy signal is asserted, the transmitter logic

is ready to receive another data byte. This output is conditional upon the

state of the cts input and the txen command bit.

Functional

Description

Figure 2 shows the a8251 block diagram.

Figure 2. a8251 Block Diagram

ncs

nrd

nwr

Read/Write

Control Logic &

cnd

Registers

din[7..0]

dout[7..0]

Transmitter

Logic

Receiver

Logic

txd

txrdy

txempty

ntxc

rxd

rxrdy

nrxc

syn_brk

extsyncd

reset

clk

ndsr

Modem

ndtr

Control

ncts

nrts

Altera Corporation

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