PORTS Forum
Ports and Interfaces => USB => Topic started by: kbs1439 on July 22, 2013, 08:05:32 am
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Hello. I'm reader your book "USB COMPLETE FORTH EDITION".
I'm Student In Korea from Asia, so my English is poor....
I have question, so please answer my question ....
Um. I know USB 3.0 bandwidth is 5 Gbps.
I know USB 3.0 adds four wire.(TX,RX) This full Duplex architecture increased bandwidth.
Is only one reason for increaing bandwidth?
I know that USB3.0 protocol changed by increase USB3.0 bandwidth.
I don't understand why USB3.0 bandwidth is ten times as big as USB2.0 bandwidth.
Please answer my question.... Cable or host controller or chipset will affect the bandwidth is it?
Also, I would like to know how to obtain the theoretical bandwidth of USB3.0.
Sorry been exposed a lot of English. Thank you.
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From USB Complete:
The SuperSpeed signaling rate, or speed of the bits on the wires in each direction,
is 5 Gbps. The USB 3.0 specification refers to the rate as 5 GT/s
(GigaTransfers per second). The 8b/10b encoding increases the number of bits
to be transmitted by 25%, so 5 Gbps on the bus translates to 4 Gbps, or 500
MB/s, of unencoded data. Framing, error detecting, and other protocols reduce
the theoretical maximum data throughput to around 400 MB/s in each direction.
In other words, the transmitters and receivers support a 5-Gbps signaling rate in each direction. The amount of useful data being transferred is about 400 MB/s max.
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Thank you because you answer my question.
And I want to know how support 5Gbps signaling rate in receiver and transmitter....
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Here is information on one USB 3.0 transceiver:
http://www.ti.com/product/tusb1310a