STV0684 datasheet(17/49 Pages) STMICROELECTRONICS

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STV0684

Functional Description

3.4

USB interface

The USB interface fulfills the three following functions:

● The first function is to download from the camera to the PC all the various objects stored on the

mass storage media. The STV0684 uses mass storage class, Bulk Only Transfer to ensure

seamless connection with most of the Operating System on the market, including PC and Mac

platforms.

● The second function is to stream concurrent audio and video through isochronous endpoints.

Once again, the STV0684 follow established and newly developed standards to ensure the

lowest burden of driver development. The STV0684 is USB Audio class and USB video class

Compliant.

● The third function allows the download of the system program code, necessary to run the

application, to either serial Flash or NAND flash soldered on the main camera PCB. This

function is extremely convenient when programming the cameras on the manufacturing lines

and is not open to final users.

Features

● USB 2.0 Compliant (Full speed device)

● Full speed (12 Mbps) signalling bit rate

● USB Audio Class Compliant

● USB Video Class Compliant

● USB Mass Storage Compliant, Bulk only Transfer protocol

● Simultaneously accessible endpoints:

➢ Isochronous endpoint (IN) for video

➢ Isochronous endpoint (IN) for audio

➢ Bulk endpoint (IN) for download

➢ Bulk endpoint (OUT) for download

➢ Interrupt endpoint (IN)

➢ Control pipe

STV0684 データシート(PDF) 17 Page - STMicroelectronics