SH7764 Datasheet, PDF (1031/1752 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)
Table 21.23 Relationship between Transfer Mode Settings by CNTMD Bit and Timings at
which Reading Data or Transmitting Data from FIFO Buffer is Enabled
Continuous or Non-
Continuous Transfer
Mode
When Reading Data or Transmitting Data is Enabled
Non-continuous
transfer
In the receiving direction (DIR = 0), reading data from the FIFO buffer is
enabled when:
(CNTMD = 0)
• This module receives one packet.
In the transmitting direction (DIR = 1), transmitting data from the FIFO
buffer is enabled when:
• Software (or DMAC) writes data of the maximum packet size to the
FIFO buffer.
or
• Software (or DMAC) writes data of the short packet size (including 0-
byte data) to the FIFO buffer and then writes 1 to BVAL.
Continuous transfer
(CNTMD = 1)
In the receiving direction (DIR = 0), reading data from the FIFO buffer is
enabled when:
• The number of the data bytes received in the FIFO buffer assigned to
the selected pipe becomes the same as the number of assigned data
bytes ((BUFSIZE + 1) * 64).
• This module receives a short packet other than a zero-length packet.
• This module receives a zero-length packet when data is already
stored in the FIFO buffer assigned to the selected pipe.
or
• This module receives the number of packets equal to the transaction
counter value specified for the selected pipe by software.
In the transmitting direction (DIR = 1), transmitting data from the FIFO
buffer is enabled when:
• The number of the data bytes written to the FIFO buffer by software
(or DMAC) becomes the same as the number of data bytes in a single
FIFO buffer plane assigned to the selected pipe.
or
• Software (or DMAC) writes to the FIFO buffer the number of data
bytes less than the size of a single FIFO buffer plane (including 0-byte
data) assigned to the selected pipe and then writes 1 to BVAL.
Rev. 1.00 Nov. 22, 2007 Page 975 of 1692
REJ09B0360-0100