LM3S9B81 Datasheet, PDF (972/1155 Pages) Texas Instruments – Stellaris® LM3S9B81 Microcontroller

Universal Serial Bus (USB) Controller
Transfer Type
Interrupt
Isochronous
Bulk
Speed
Low-Speed or Full-Speed
Full-Speed
Full-Speed
Valid values (m)
0x01 – 0xFF
0x01 – 0x10
0x02 – 0x10
USB Host Transmit Interval Endpoint 1 (USBTXINTERVAL1)
Base 0x4005.0000
Offset 0x11B
Type R/W, reset 0x00
7
6
5
4
3
2
1
0
TXPOLL / NAKLMT
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
Interpretation
The polling interval is m frames.
The polling interval is 2^(m-1) frames.
The NAK Limit is 2^(m-1) frames. A value of 0
or 1 disables the NAK timeout function.
Bit/Field
7:0
Name
TXPOLL / NAKLMT
Type
R/W
Reset
0x00
Description
TX Polling / NAK Limit
The polling interval for interrupt/isochronous transfers; the NAK limit for
bulk transfers. See table above for valid entries; other values are
reserved.
972
June 29, 2010
Texas Instruments-Advance Information