SH7670 Datasheet, PDF (719/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 17 USB 2.0 Host/Function Module (USB)
Initial
Bit
Bit Name
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
Software can clear this bit to 0 by writing 0 to the bit.
Here, 1 should be written to the other bits in this
register.
(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.
Rev. 1.00 Nov. 14, 2007 Page 693 of 1262
REJ09B0437-0100