Why USB3.0 bandwidth is increase?

[kbs1439]

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.

[Jan Axelson]

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.

[kbs1439]

Thank you because you answer my question.

And I want to know how support 5Gbps signaling rate in receiver and transmitter....

[Jan Axelson]

Here is information on one USB 3.0 transceiver:

http://www.ti.com/product/tusb1310a