LM3S3768 Luminary Micro, Inc, LM3S3768 Datasheet - Page 577

• Manufacturer Part Number: LM3S3768
• Description: Lm3s3768 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Type
USB Host Transmit Interval Endpoint 1 (USBTXINTERVAL1)
Base 0x4005.0000
Offset 0x11B
Type R/W, reset 0x00
June 02, 2008
Host
Bit/Field
7:0
R/W
7
0
R/W
Register 75: USB Host Transmit Interval Endpoint 1 (USBTXINTERVAL1),
offset 0x11B
Register 76: USB Host Transmit Interval Endpoint 2 (USBTXINTERVAL2),
offset 0x12B
Register 77: USB Host Transmit Interval Endpoint 3 (USBTXINTERVAL3),
offset 0x13B
USBTXINTERVALn is an 8-bit register that, for interrupt and isochronous transfers, defines the
polling interval for the currently selected transmit endpoint. For bulk endpoints, this register sets the
number of frames after which the endpoint should time out on receiving a stream of NAK responses.
The USBTXINTERVALn register value defines a number of frames, as follows:
Transfer Type
Interrupt
Isochronous
Bulk
6
0
TXPOLL/NAKLMT
R/W
5
0
Name
TXPOLL/NAKLMT
R/W
Low-Speed or Full-Speed
4
0
R/W
Full-Speed
Full-Speed
3
0
Speed
Type
R/W
R/W
2
0
R/W
Reset
0x00
1
0
Valid values (m)
Preliminary
R/W
1 – 255
1 – 16
2 – 16
0
0
Description
TX Polling / NAK Limit
Polling interval for interrupt/isochronous transfers; NAK limit for bulk
transfers.
Interpretation
Polling interval is m frames.
Polling interval is 2
NAK Limit is 2
timeout function.
(m-1)
frames. A value of 0 or 1 disables the NAK
(m-1)
frames.
LM3S3768 Microcontroller
577