SH7205 Datasheet, PDF (1223/1904 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7200 Series

Section 24 USB 2.0 Host/Function Module (USB)
(b) Conditions for Pipes in the Receiving Direction
• Packet reception in the pertinent pipe has completed and the FIFO buffer has become ready for
reading while the FIFO buffer assigned to the pipe is not writable by the CPU (i.e., when 0 is
read from the BSTS bit).
A request trigger is not generated for a transaction in which a data PID disagreement has
occurred.
In continuous transmission/reception mode, a request trigger is not generated if the size of data
is MaxPacketSize and there is a free space remaining in the buffer.
When a short packet is received, a request trigger is generated even if there is a free space in
the FIFO buffer.
When a transaction is used, a request trigger is generated when the set number of packets has
been received. In this case, a request trigger is generated even when there is some free space in
the FIFO buffer.
• When the FIFO buffer is configured as double buffers, reading from a FIFO buffer has
completed while the other buffer is also ready to be read. Even if reception into one FIFO
buffer has completed while the other buffer is being read, a request trigger is not generated
until the reading from the buffer is completed.
The BRDY interrupt is not generated during communication in the status stage of control transfer
when the function controller function is selected.
The BRDY interrupt status bit of the pertinent pipe can be cleared by writing 0 to the bit
corresponding to the pipe in this register. This interrupt status clearing must be done before
making access to the FIFO buffer.
(2) When BRDYM = 0 and BFRE = 1 are Set
With this setting, a BRDY interrupt is generated when all the data for one round of transfer have
been read through a receiving pipe and the bit corresponding to that pipe is set.
This module determines that the last data for one round of transfer has been read in any of the
following conditions.
Rev. 1.00 Mar. 25, 2008 Page 1191 of 1868
REJ09B0372-0100