LM3S3768 Luminary Micro, Inc, LM3S3768 Datasheet - Page 580

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

Reset
Type
Univeral Serial Bus (USB) Controller
USB Host Receive Polling Interval Endpoint 1 (USBRXINTERVAL1)
Base 0x4005.0000
Offset 0x11D
Type R/W, reset 0x00
580
Host
Bit/Field
7:0
R/W
7
0
R/W
Register 81: USB Host Receive Polling Interval Endpoint 1
(USBRXINTERVAL1), offset 0x11D
Register 82: USB Host Receive Polling Interval Endpoint 2
(USBRXINTERVAL2), offset 0x12D
Register 83: USB Host Receive Polling Interval Endpoint 3
(USBRXINTERVAL3), offset 0x13D
USBRXINTERVAL1 is an 8-bit register that, for interrupt and isochronous transfers, defines the
polling interval for the currently selected receive 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 value that is set defines the number of frames, as follows:
Transfer Type
Interrupt
Isochronous
Bulk
6
0
TXPOLL/NAKLMT
R/W
5
0
Name
TXPOLL/NAKLMT
R/W
Speed
Low-Speed or Full-Speed
Full-Speed
Full-Speed
4
0
R/W
3
0
Type
R/W
R/W
2
0
R/W
Reset
0x00
1
0
Valid values (m)
1 – 255
1 – 16
2 – 16
Preliminary
R/W
0
0
Description
RX 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
Note:
A value of 0 or 1 disables the NAK timeout
function.
(m-1)
(m-1)
frames.
frames.
June 02, 2008