USB2.0接口與1394接口優(yōu)劣勢(shì)對(duì)比
USB2.0與1394接口到底有什么不同,它們之間有什么優(yōu)劣勢(shì)呢?下面請(qǐng)看介紹:
USB 2.0優(yōu)勢(shì):
•對(duì)于很多應(yīng)用來(lái)說(shuō)足夠的數(shù)據(jù)帶寬(480Mb/s)
•幾乎所有的計(jì)算機(jī)都可以支持他的使用
•非常低的成本
USB 2.0劣勢(shì):
•帶寬限制
•供電限制,供電功率不夠使某些芯片不能正常工作
•無(wú)工業(yè)標(biāo)準(zhǔn)
1394優(yōu)勢(shì):
•高達(dá)800Mb/s的數(shù)據(jù)帶寬
•簡(jiǎn)單的自動(dòng)數(shù)據(jù)同步機(jī)制
•高功率供電
•有工業(yè)標(biāo)準(zhǔn)
•低成本
1394劣勢(shì):
•數(shù)據(jù)帶寬仍然不足以在一些級(jí)聯(lián),高分辨率,高速的ccd上應(yīng)用
•線纜長(zhǎng)度受限
•一般情況下需要外插一塊擴(kuò)展卡
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IEEE-1394b
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USB 2.0
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Communiacation type
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Serial
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Serial
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Hot pluggable
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Yes
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Yes
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Supported data rates(Mb/s)
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100,200,400,800
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1.5,12,480
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Future:1600,3200
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Future:4800
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Maximum total bandwidtn
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100MB/s
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57MB/s
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Effective image data bandwidth
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80MB/s
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50MB/s(bulk mode)
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Network topology
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Peer-to-Peer
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Master-Slave
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Cable type
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4-,6-,or 9-pin STP
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4-pin STP
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Unshieldede TP,GOF
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Cable length(STP)
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4.5M
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6M
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Cable length(STP) with hubs
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72M(15hubs)
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30M(5hubs)
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Max devices
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63
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127
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Available PC interfaces
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Bulit-in,PCI,PCI Express,CarBus,ExpressCar
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Bulit-in,PCI,PCI Express,CarBus,ExpressCar
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Power
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1.5A ,8 TO 30V,45W max
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500mA,4.75 to5.25 V, 2.5W max
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Transcation types
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Isochronous and asynchronous transfers
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Bulk,Isochronous, interrupt, control transfers
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Broadcast write mechanism
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Yes
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No
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添加日期:2009-12-19
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