Filter
Top Products
Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1407 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
15 OVRN 0 R/W* Overrun/Underrun Detection Status
Indicates whether an overrun/underrun error has
been detected in the pipe during isochronous
transfer.
0: No error
1: An error occurred
This bit can be cleared to 0 by writing 0 to the bit.
(1) When the host controller function is selected
This module sets this bit to 1 on any of the
following conditions.
For the isochronous transfer pipe in the
transmitting direction, the time to issue an OUT
token comes before all the transmit data has
been written to the FIFO buffer.
For the isochronous transfer pipe in the receiving
direction, the time to issue an IN token comes
when no FIFO buffer planes are empty.
(2) When the function controller function is selected
This module sets this bit to 1 on any of the
following conditions.
For the isochronous transfer pipe in the
transmitting direction, the IN token is received
before all the transmit data has been written to
the FIFO buffer.
For the isochronous transfer pipe in the receiving
direction, the OUT token is received when no
FIFO buffer planes are empty.
Note: This bit is provided for debugging. The system
should be designed so that no
overrun/underrun should occur.