LM3S3748 Datasheet, PDF (577/753 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S3748 Microcontroller
Register 80: USB Host Receive Polling Interval Endpoint 1
(USBRXINTERVAL1), offset 0x11D
Register 81: USB Host Receive Polling Interval Endpoint 2
(USBRXINTERVAL2), offset 0x12D
Register 82: USB Host Receive Polling Interval Endpoint 3
(USBRXINTERVAL3), offset 0x13D
Host
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 Speed
Valid values (m) Interpretation
Interrupt
Low-Speed or Full-Speed 1 – 255
Polling interval is m frames.
Isochronous Full-Speed
1 – 16
Polling interval is 2^(m-1) frames.
Bulk
Full-Speed
2 – 16
NAK Limit is 2^(m-1) frames.
Note: A value of 0 or 1 disables the NAK timeout
function.
USB Host Receive Polling Interval Endpoint 1 (USBRXINTERVAL1)
Base 0x4005.0000
Offset 0x11D
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
Bit/Field
7:0
Name
TXPOLL/NAKLMT
Type
R/W
Reset
0x00
Description
RX Polling/NAK Limit
Polling interval for interrupt/isochronous transfers; NAK limit for bulk
transfers.
April 08, 2008
577
Preliminary