TM4C1237H6PM Datasheet, PDF (1139/1278 Pages) Texas Instruments – Tiva Microcontroller

Tiva^™ TM4C1237H6PM Microcontroller
OTG A /
Host
Register 85: USB NAK Limit (USBNAKLMT), offset 0x10B
USBNAKLMT is an 8-bit register that sets the number of frames after which endpoint 0 should time
out on receiving a stream of NAK responses. (Equivalent settings for other endpoints can be made
through their USBTXINTERVALn and USBRXINTERVALn registers.)
The number of frames selected is 2^(m-1) (where m is the value set in the register, with valid values of
2–16). If the Host receives NAK responses from the target for more frames than the number
represented by the limit set in this register, the endpoint is halted.
Note: A value of 0 or 1 disables the NAK timeout function.
USB NAK Limit (USBNAKLMT)
Base 0x4005.0000
Offset 0x10B
Type RW, reset 0x00
7
6
5
4
3
2
1
0
reserved
NAKLMT
Type RO
RO
RO
RW
RW
RW
RW
RW
Reset
0
0
0
0
0
0
0
0
Bit/Field
7:5
4:0
Name
reserved
NAKLMT
Type
RO
RW
Reset
0x0
0x0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
EP0 NAK Limit
This field specifies the number of frames after receiving a stream of
NAK responses.
June 12, 2014
Texas Instruments-Production Data
1139