The difference between USB interrupt transmission and isochronous transmission

Never understood the difference between USB ISO transmission and interrupt transmission.

Later carefully read the next USB2.0 spec only then understand.

Interrupt transmission and ISO transmission are all equal-time transmissions, which are sent once at an interval.

The difference is that interrupt transmission is to ensure the accuracy of data transmission, ISO is not guaranteed. So look at the protocol diagram in spec.

Interrupt token, Data, handshake three segments, wherein the handshake to determine the transmission results, so as to ensure the correctness of transmission.

ISO transmits only token and data two segments, so it is not guaranteed to be accurate.

Interrupt is like Tcp,iso, like UDP.

The difference between USB interrupt transmission and isochronous transmission