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(yè)數(shù)： 20/21頁(yè)
文件大?。?/td> 338K
代理商： A8251
44
Altera Corporation
a8251 Programmable Communications Interface Data Sheet
Figure 10
shows the read and write data cycles for the
a8251
.
Figure 10. Read & Write Data Cycles
The X indicates “don’t care.”
Variations &
Clarifications
The following characteristics distinguish the Altera
a8251
from the
Intel 8251A device:
I
The
a8251
has separate input and output data buses, while the
Intel 8251A device has a bidirectional data bus.
The
a8251
has separate
extsyncd
and
syn_brk
signals, while the
Intel 8251A device has a bidirectional
SYNDET
/
BRKDET
signal.
In a write cycle to the
a8251
, the
din[7..0]
inputs must be held for
one
ntxc
clock cycle after the rising edge of the
nwr
signal.
The
a8251
has an active low
reset
input. The Intel 8251A has an
active-high
reset
input.
I
I
I
txrdy
nwr
din
Valid Data
X
X
cnd
X
X
ncs
Write Data
rxrdy
ncs
X
X
cnd
Valid Data
din
nrd
Read Data
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