Preliminary
Registers
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20.9.6.2.13 NAKLimit0 Register (Host mode only) (USBn_HOST_NAKLIMIT0)
The NAKLimit0 register (Host mode only) (USBn_HOST_NAKLIMIT0) is a 5-bit register that sets the
number of frames/microframes (high-speed transfers) after which endpoint 0 should timeout on
receiving a stream of NAK responses. (Equivalent settings for other endpoints can be made through
their TxInterval and RxInterval registers.) The number of frames/microframes selected is 2(m-1) (where
m is the value set in the register, valid values 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 will be
halted. Note: A value of 0 or 1 disables the NAK timeout function.
The NAKLimit0 register is shown in
and described in
Figure 20-168. NAKLimit0 Register (Host mode only) (USBn_HOST_NAKLIMIT0)
7
5
4
0
Reserved
EP0NAKLIMIT
R-0h
R/W-0-1Fh
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-185. NAKLimit0 Register (Host mode only) (USBn_HOST_NAKLIMIT0) Field
Descriptions
Bit
Field
Description
7-5
Reserved
Reserved
4-0
EP0NAKLIMIT
Sets the number of frames/microframes (high-speed transfers) after which endpoint 0 should time
out on receiving a stream of NAK responses. The number of frames/microframes selected is 2(-1)
(where m is the value set in the register, valid values 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 will be halted. Note: A value of 0 or 1 disables the NAK timeout function.
1964
Universal Serial Bus (USB)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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