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3.16.8
USB Device answer
USB controller (UDC) sets various register and initialization in UDC in detecting of
hardware reset, detecting of USB bus reset, and enumeration answer.
Below is explaining about each condition.
(1) Condition in detect in bus reset.
When UDC detects bus reset on USB signal line, it initializes internal register, and it
prepares enumeration operation from USB host. After detect in USB reset, UDC sets
ENDPOINT0 to control transfer type 8-byte payload and default address for using
default pipe. And endpoint except for it is prohibited.
Register name
ENDPOINT STATUS
(2) Detail of STATUS register
Status register that was prepared every endpoint shows condition of every endpoint
in UDC.
Each condition affects transfer various USB. Condition changing in each transfer
type refers to chapter 5.
EPx_STATUS register value is 0 to 3, and it shows conditions of below. 0 to 4 are
result of various transfers. It can be confirmed previous result that is transferred to
endpoint by confirming from external of UDC.
0
1
2
3
4
These conditions mean that endpoint operate normally. Meaning that is showed is
different every transfer mode. Therefore, please refer to below each transfer mode
column.
EP0
Except for EP0
READY
DATAIN
FULL
TX_ERR
RX_ERR
92CZ26A-448
Initial value
40H
5CH
TMP92CZ26A
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