SH7265 Datasheet, PDF (1301/2024 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 25 USB 2.0 Host/Function Module (USB)
(b) Conditions for Pipes in the Receiving Direction
• In a pipe specified for isochronous transfer, when the time to issue an IN token comes while
the FIFO buffer has no empty space:
In this case, this module discards the data received in response to the IN token and sets the bit
corresponding to the pipe and the OVRN bit to 1. Further, it also sets the CFRCDE bit to 1 if a
packet error has been detected in the data received in response to the IN token.
• In a pipe not specified for isochronous transfer, when the function device returns no response
(timeout is detected without detecting a data packet from the function device) to the IN token
sent by this module, or when any error has detected in the packet from the function device for
consecutive three times:
In this case, this module sets the bit corresponding to the pipe and modifies the PID bit setting
for the pipe to NAK.
• In a pipe specified for isochronous transfer, when the function device returns no response
(timeout is detected without detecting a data packet from the function device) to the IN token,
or when any error has detected in the packet from the function device:
In this case, this module sets the bit corresponding to the pipe to 1 (it does not modify the PID
bit setting for the pipe).
• In a pipe specified for isochronous transfer, when a CRC error or bit stuffing error has detected
in the received data packet:
In this case, this module sets the bit corresponding to the pipe and the CRCE bit to 1.
• When a STALL handshake is received:
In this case, this module sets the bit corresponding to the pipe and modifies the PID bit setting
for the pipe to STALL.
(2) Connection with which Split Transactions can Occur when the Host Controller
Function is Selected
(a) Conditions for Pipes in the Transmitting Direction
• In a pipe specified for isochronous transfer, when the time to issue an OUT token comes while
the FIFO buffer contains no data for transmission:
In this case, this module sets the bit corresponding to the pipe to 1 when it issues a Start-Split
transaction (S-Split) and sets the OVRN bit to 1. It also transmits a zero-length packet
subsequent to the OUT token.
• In a pipe not specified for isochronous transfer, when the hub returns no response (timeout is
detected without detecting a handshake packet from the hub) to the S-Split or Complete-Split
transaction (C-Split), or when any error has detected in the packet from the hub for consecutive
three times:
In this case, this module sets the bit corresponding to the pipe and modifies the PID bit setting
Rev. 1.00 Mar. 14, 2008 Page 1265 of 1984
REJ09B0351-0100