RAJEEVA Posted May 25, 2020 Share Posted May 25, 2020 @attila We are capturing LED data at rate of 20k(0.2 MBPS). some times when we connect ad2 to usb 2.0, we are observing data loss. but when we connect ad2 to usb3.0, we didn't see any data loss. any constraints are there from AD2 should connect to USB 3.0? otherwise why are we observing data loss? Link to comment Share on other sites More sharing options...
attila Posted May 28, 2020 Share Posted May 28, 2020 Hi @RAJEEVA Recording at this rate should't be an issue even with USB 1.1 (full-speed) or on a slow ARM SBC. The AD2 has USB 2.0 controller, so there should be no difference when using USB 2.0 or 3.x host. You may have other devices (system card reader, camera, ethernet...) connected to the same USB 2.0 root hub which highly reduce the rate or time to time block the respective USB channel. Link to comment Share on other sites More sharing options...
RAJEEVA Posted June 17, 2020 Author Share Posted June 17, 2020 @attila Thanks. Link to comment Share on other sites More sharing options...
Wayne Chen Posted June 18, 2020 Share Posted June 18, 2020 Hello Attila, Is there a new AD in pipeline to utilize high speed USB 3.0 to support faster data rates (for example, 25MHz SPI)? Thanks a lot. Wayne Chen 06/18/2020 Link to comment Share on other sites More sharing options...
attila Posted June 18, 2020 Share Posted June 18, 2020 Hi @Wayne Chen For higher sample rate I would no rely purely on the USB rate since the bulk transfer have no guaranteed bandwidth, so without suffice buffering it may lead to data loss. The AD can use data compression in Logic Analyzer recording and the Protocol tool also uses compression. With this you can capture high frequency bursts, which are typically used in communications. With long busts (>16kb device buffer limit) or high average bit rates (>1Mbps usb transfer) the device buffer can overflow. Link to comment Share on other sites More sharing options...
Wayne Chen Posted June 20, 2020 Share Posted June 20, 2020 Thank you Attila, Nice to have a solution to record I2S data streams with HD resolutions (for example, 96kHZ and 192kHz sample rates) to replace a bucky AP equipement for debugging. No I use an I2S DAC EVM as a workaround...Wayne Chen 06/20/2020 Link to comment Share on other sites More sharing options...
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RAJEEVA
@attila
We are capturing LED data at rate of 20k(0.2 MBPS). some times when we connect ad2 to usb 2.0, we are observing data loss.
but when we connect ad2 to usb3.0, we didn't see any data loss.
any constraints are there from AD2 should connect to USB 3.0?
otherwise why are we observing data loss?
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