SH7764 Datasheet, PDF (1006/1752 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC Engine Family SH-4A Series

Section 21 USB 2.0 Host/Function Module (USB)
For the pipe for the transfers other than isochronous transfers in which an interrupt is
generated, this module generates a NRDY interrupt request when a NAK handshake is
transferred after the data following the OUT token was received, setting the PIPENRDY bit
to 1.
However, during re-transmission (due to DATA-PID disagreement), the NRDY interrupt
request is not generated. In addition, if an error occurs in the DATA packet, the NRDY
interrupt request is not generated.
 On receiving a PING token when there is no space available in the FIFO buffer.
In this case, this module generates a NRDY interrupt request at the reception of the PING
token, setting the PIPENRDY bit to 1.
 For the pipe for isochronous transfers, when a token is not received normally within an
interval frame.
In this case, this module generates a NRDY interrupt request, setting the PIPENRDY bit to
1.
Rev. 1.00 Nov. 22, 2007 Page 950 of 1692
REJ09B0360-0100