LM3S5739 Datasheet, PDF (730/856 Pages) Texas Instruments – Stellaris® LM3S5739 Microcontroller

Universal Serial Bus (USB) Controller
Bit/Field
4
3
2
1
0
Name
DMAEN
FDT
DMAMOD
DTWE
DT
Type
R/W
R/W
R/W
R/W
R/W
Reset
0
0
Description
DMA Request Enable
Value Description
0 Disables the µDMA request for the transmit endpoint.
1 Enables the µDMA request for the transmit endpoint.
Note:
3 TX and 3 /RX endpoints can be connected to the µDMA
module. If this bit is set for a particular endpoint, the DMAATX,
DMABTX, or DMACTX field in the USB DMA Select
(USBDMASEL) register must be programmed
correspondingly.
Force Data Toggle
Value Description
0 No effect.
1 Forces the endpoint DT bit to switch and the data packet to be
cleared from the FIFO, regardless of whether an ACK was
received. This bit can be used by interrupt transmit endpoints
that are used to communicate rate feedback for isochronous
endpoints.
0
DMA Request Mode
Value Description
0 An interrupt is generated after every µDMA packet transfer.
1 An interrupt is generated only after the entire μDMA transfer is
complete.
Note: This bit must not be cleared either before or in the same cycle
as the above DMAEN bit is cleared.
0
Data Toggle Write Enable
Value Description
0 The DT bit cannot be written.
1 Enables the current state of the transmit endpoint data to be
written (see DT bit).
This bit is automatically cleared once the new value is written.
0
Data Toggle
When read, this bit indicates the current state of the transmit endpoint
data toggle.
If DTWE is High, this bit may be written with the required setting of the
data toggle. If DTWE is Low, any value written to this bit is ignored. Care
should be taken when writing to this bit as it should only be changed to
RESET the transmit endpoint.
730
November 17, 2011
Texas Instruments-Production Data