SH7641 Datasheet, PDF (818/1036 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH™ RISC engine Family / SH7641 Series

Section 20 USB Function Module
20.4.3 Control Transfer
Control transfer consists of three stages: setup, data (not always included), and status (figure 20.4).
The data stage comprises a number of bus transactions. Operation flowcharts for each stage are
shown below.
Control IN
Setup stage
SETUP(0)
DATA0
Control OUT
SETUP(0)
DATA0
No data
SETUP(0)
DATA0
IN(1)
DATA1
OUT(1)
DATA1
Data stage
IN(0)
DATA0
...
IN(0/1)
DATA0/1
OUT(0)
DATA0
. . . OUT(0/1)
DATA0/1
Status stage
OUT(1)
DATA1
IN(1)
DATA1
IN(1)
DATA1
Figure 20.4 Transfer Stages in Control Transfer
Rev. 4.00 Sep. 14, 2005 Page 768 of 982
REJ09B0023-0400