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參數(shù)資料
| 型號(hào)： | a8251 |
| 廠商： | Altera Corporation |
| 英文描述： | Programmable Communications Interface(可編程通信接口) |
| 中文描述： | 可編程通信接口（可編程通信接口） |
| 文件頁數(shù)： | 3/21頁 |
| 文件大?。?/td> | 338K |
| 代理商： | A8251 |
Altera Corporation
27
a8251 Programmable Communications Interface Data Sheet
Functional
Description
Figure 2
shows the
a8251
block diagram.
Figure 2. a8251 Block Diagram
Name
Type
Polarity
Description
txd
Output
Output
–
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.
txempty
High
txrdy
Output
High
Table 1. a8251 Ports (Part 2 of 2)
nrd
nwr
cnd
din[7..0]
dout[7..0]
Read/Write
Control Logic &
Registers
Transmitter
Logic
ntxc
txempty
txrdy
txd
ncs
Modem
Control
nrts
ncts
ndtr
ndsr
Receiver
Logic
rxd
extsyncd
syn_brk
nrxc
rxrdy
reset
clk
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