ECP并行口是 Extended Capabilities Port 的缩写,外观同并行口,是 25 针母插座:
ECP:扩展性能端口,ECP扩充型工作模式,ECP采用双向全双工数据传输,传输速率比EPP还要高一些
ECP并行口信号定义 |
Pin |
Name |
Dir |
Description |
---|---|---|---|
1 |
nStrobe |
|
Strobe |
2 |
data0 |
|
Address, Data or RLE Data Bit 0 |
3 |
data1 |
|
Address, Data or RLE Data Bit 1 |
4 |
data2 |
|
Address, Data or RLE Data Bit 2 |
5 |
data3 |
|
Address, Data or RLE Data Bit 3 |
6 |
data4 |
|
Address, Data or RLE Data Bit 4 |
7 |
data5 |
|
Address, Data or RLE Data Bit 5 |
8 |
data6 |
|
Address, Data or RLE Data Bit 6 |
9 |
data7 |
|
Address, Data or RLE Data Bit 7 |
10 |
/nAck |
|
Acknowledge |
11 |
Busy |
|
Busy |
12 |
PError |
|
Paper End |
13 |
Select |
|
Select |
14 |
/nAutoFd |
|
Autofeed |
15 |
/nFault |
|
Error |
16 |
/nInit |
|
Initialize |
17 |
/nSelectIn |
|
Select In |
18 |
GND |
|
Signal Ground |
19 |
GND |
|
Signal Ground |
20 |
GND |
|
Signal Ground |
21 |
GND |
|
Signal Ground |
22 |
GND |
|
Signal Ground |
23 |
GND |
|
Signal Ground |
24 |
GND |
|
Signal Ground |
25 |
GND |
|
Signal Ground |
如果计算机配有ECP或EPP并行口,那么当用DCC(直接电缆连接)联网时,它大约可以达到以太网链路速率的三分之一(标准的每秒10兆比特的以太网络一般能提供350KB/s~400KB/s的实际通信吞吐能力)。三种接口中,其中ECP和EPP都是普通标准并行口(Normal)增强方式。它们分别改善了原来并行口的一些弱点,并和原来的模式相兼容。所有的新PC上都配置了支持EPP和ECP的并行口。标准的并行口一般用来在PC与打印机之间传送数据。而EPP在输入或输出数据时表现得很出色。如果您在使用外置式驱动器(例如活动硬盘),