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Questions about handhasking in isochronous transfers of USB

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paash

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USB Query

Hello All,

I have a small doubt about handhasking in Isochronous transfers of USB.

Is it mandatory to send a stall handshake if the endpoint is stalled.....?
Is it mandatory to send a nak handshake if the endpoint is empty.....?
Both the above cases are concidering the in transaction of an USB and both the endpoints are isochronous endpoints.

Or is it ok if I don't send any handshake in the above cases for isochronous transfers.

Thanks in advance.
 

Re: USB Query

paash said:
Hello All,

I have a small doubt about handhasking in Isochronous transfers of USB.

Is it mandatory to send a stall handshake if the endpoint is stalled.....?
Is it mandatory to send a nak handshake if the endpoint is empty.....?
Both the above cases are concidering the in transaction of an USB and both the endpoints are isochronous endpoints.

Thanks in advance.
Click to expand...
There is no handshake on ISO transfers.
NAK is only defined for Bulk and Interrupt. See also USB Sspec...

usbman
 

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