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Section 26 USB 2.0 Host/Function Module
Page 1532 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
(d) Overrun and underrun errors
When host controller function is selected:
When using isochronous IN transfers (reception), the IN token was received but the buffer
memory is not empty.
When using isochronous OUT transfers (transmission), the OUT token was transmitted, but
the data was not in the buffer memory.
When function controller function is selected:
When using isochronous IN transfers (transmission), the IN token was received but the data
was not in the buffer memory.
When using isochronous OUT transfers (reception), the OUT token was received, but the
buffer memory was not empty.
(e) Interval errors
When function controller function is selected, the following cases are considered as interval
errors:
During an isochronous IN transfer, the token could not be received during the interval frame.
During an isochronous OUT transfer, the OUT token was received during frames other than
the interval frame.