LM3S9B81 Datasheet, PDF (947/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Stellaris® LM3S9B81 Microcontroller
OTG A / Host Mode
USB Transmit Control and Status Endpoint 1 Low (USBTXCSRL1)
Base 0x4005.0000
Offset 0x112
Type R/W, reset 0x00
7
6
5
4
3
2
1
0
NAKTO CLRDT STALLED SETUP FLUSH ERROR FIFONE TXRDY
Type R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
Bit/Field
7
Name
NAKTO
Type
R/W
Reset
0
Description
NAK Timeout
Value Description
0 No timeout.
1 Bulk endpoints only: Indicates that the transmit endpoint is halted
following the receipt of NAK responses for longer than the time
set by the NAKLMT field in the USBTXINTERVALn register.
Software must clear this bit to allow the endpoint to continue.
6
CLRDT
R/W
0
Clear Data Toggle
Writing a 1 to this bit clears the DT bit in the USBTXCSRHn register.
5
STALLED
R/W
0
Endpoint Stalled
Value Description
0 A STALL handshake has not been received.
1 Indicates that a STALL handshake has been received. When
this bit is set, any µDMA request that is in progress is stopped,
the FIFO is completely flushed, and the TXRDY bit is cleared.
Software must clear this bit.
4
SETUP
R/W
0
Setup Packet
Value Description
0 No SETUP token is sent.
1 Sends a SETUP token instead of an OUT token for the
transaction. This bit should be set at the same time as the
TXRDY bit is set.
Note: Setting this bit also clears the DT bit in the USBTXCSRHn
register.
June 29, 2010
947
Texas Instruments-Advance Information