Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
If you are thinking of a particular chip, you should mention it.
Generally, full speed USB requires a timing accuracy of +/- 0.25%. Most internal oscillators are never able to keep it.
FTDI FT232R is one of the few chips that do full speed USB with an internal oscillator.
The said Cypress controllers are low speed USB. Also other vendors USB processors (e.g. from Microchip) are
able to achieve 1.5% low speed accuracy with an internal oscillator The enCoReIII full speed controller is said
to achieve 0.25% accuracy by self-tuning a low accuracy internal oscillator to the USB.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
