Home > Design Support > Cypress Developer Community^TM > Cypress Forums > USB Controllers > FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2

FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2

Moderator:

RSKV

Follow this topic

FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2

	emesjx posted on 08 Mar 2011 8:25 PM PST 1 Forum Post

In our image processing system, the line frequency of linear CCD camera(512 pixel) is 1KHz(1ms),the image data is inputed in real-time to a laptop or desktop host on Windows XP SP2 by USB, The USB device use FX2LP(CY7C68013A) which work in slave FIFO mode.the data channel is endpoint 6 which is 4X512 buffer and Bulk transfer in high speed mode.The symptom is: if Host is a desktop computer,Bulk transfer lose data occasionally(very few!),if Host is a laptop(notebook computer),may lose data very frequently.Why???two host use the same OS-Windows XP SP2.

If a computer (Laptop or Desktop) use a Intel ICH4 South Bridge as I/O Control Hub,BULK transfer of the FX2LP work well without any data lose!.If the Hub is above ICH6, the Desktop lose very few data,but the Laptop (i.e. Lenovo G450) lose data much more!

we test it using EZUSB.sys and CYUSB.sys drivers in about ten Laptops and Desktops.

Re: FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2

	posted on 10 Mar 2011 04:29 AM PST Senior Member 11 Forum Posts

Hi,

Can you please create a tech-support case for this query? This is a fairly more complicated issue, and we'd like to get you involved with our tech-support team.

You can create a case by clicking on "MyAccount"->"MyCases" in the menu bar on top..

ALL CONTENT AND MATERIALS ON THIS SITE ARE PROVIDED "AS IS". CYPRESS SEMICONDUCTOR AND ITS RESPECTIVE SUPPLIERS MAKE NO REPRESENTATIONS ABOUT THE SUITABILITY OF THESE MATERIALS FOR ANY PURPOSE AND DISCLAIM ALL WARRANTIES AND CONDITIONS WITH REGARD TO THESE MATERIALS, INCLUDING BUT NOT LIMITED TO, ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHT. NO LICENSE, EITHER EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, IS GRANTED BY CYPRESS SEMICONDUCTOR. USE OF THE INFORMATION ON THIS SITE MAY REQUIRE A LICENSE FROM A THIRD PARTY, OR A LICENSE FROM CYPRESS SEMICONDUCTOR.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms and Conditions of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms and Conditions of this site. Cypress Semiconductor and its suppliers reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

Cypress Perform

FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2

Re: FX2LP using BULK transfer type in high speed mode lose data on laptop more than desktop in Windows XP SP2