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Section 26 USB 2.0 Host/Function Module
Page 1432 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
9 DBLB 0 R/W Double Buffer Mode
Selects either single or double buffer mode for the
FIFO buffer used by the selected pipe.
0: Single buffer
1: Double buffer
This bit is valid when PIPE1 to PIPE5 are selected.
When this bit has been set to 1, this module assigns
two planes of the FIFO buffer size specified by the
BUFSIZE bits in PIPEBUF to the selected pipe.
Specifically, the following expression determines the
FIFO buffer size assigned to the selected pipe by this
module.
(BUFSIZE + 1) 64 (DBLB + 1) [bytes]
Modify these bits while CSSTS is 0 and PID is NAK
and before the pipe is selected by the CURPIPE bits.
To modify these bits after completing USB
communication using the selected pipe, write 1 and
then 0 to ACLRM continuously to clear the FIFO
buffer assigned to the selected pipe while the
CSSTS, PID, and CURPIPE bits are in the above-
described state.
Before modifying these bits after modifying the PID
bits for the selected pipe from BUF to NAK, check
that CSSTS and PBUSY are 0. However, if the PID
bits have been modified to NAK by this module,
checking PBUSY is not necessary.