[usb] Help

["niko zhang" <niko_zhang@hotmail.com>]

Hi:
  I am interested in USB Test product.I has some question to ask you.

  1.I want to test usb core(verilog).Could you give me some advice?

  2.I search some infomation about usb test produce.For example,CATC USB 
Test produce,Root 1,SBAE-10,etc.Could you tell me which company produce is 
used  more comprehensively?

  3.I has some question about CATC USB Test produce.I read some document 
about CATC USB Test Tool.But I can't really know the difference among CATC 
USB Test Tools.The difference,I think,it is only some fuction.One has it,and 
others has not it.Could you give me more infomation about CATC USB Test 
produce or some advice?

  4.The host transmits data,device receive it,then return some 
handshake.But,when the device transmits data,how do the device know what 
will be transmitted?How do I edit the data that the device will transmit?The 
test produce,can it be edited just like writing some 8051 program ?

  Thanks.I expect your answer!

                             Niko_zhang


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