SH7263 Datasheet, PDF (1385/1862 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 25 USB 2.0 Host/Function Module (USB)
25.4.8 Isochronous Transfers (PIPE1 and PIPE2)
This module has the following functions pertaining to isochronous transfers.
1. Notification of isochronous transfer error information
2. Interval counter (specified by the IITV bit)
3. Isochronous IN transfer data setup control (IDLY function)
4. Isochronous IN transfer buffer flush function (specified by the IFIS bit)
This module does not support the High Bandwidth transfers of isochronous transfers.
Note: When using isochronous OUT transfer, see section 25.5.1, Note on Using Isochronous
OUT Transfer.
(1) Error Detection with Isochronous Transfers
This module has a function for detecting the error information noted below, so that when errors
occur in isochronous transfers, software can control them. Tables 25.24 and 25.25 show the
priority in which errors are confirmed and the interrupts that are generated.
1. PID errors
• If the PID of the packet being received is illegal
2. CRC errors and bit stuffing errors
• If an error occurs in the CRC of the packet being received, or the bit stuffing is illegal
3. Maximum packet size exceeded
• The maximum packet size exceeded the set value.
4. 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.
5. Interval errors
• During an isochronous IN transfer, the token could not be received during the interval frame.
Rev. 2.00 Mar. 14, 2008 Page 1351 of 1824
REJ09B0290-0200