Usb Host Transmit Interval Endpoint N Register (Usbtxinterval[N]); Usbtxinterval[N] Frame Numbers; Usb Host Transmit Interval Endpoint N Register(Usbtxinterval[N]) Field Descriptions - Texas Instruments Concerto F28M36 Series Technical Reference Manual

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18.5.41 USB Host Transmit Interval Endpoint n Register
(USBTXINTERVAL[1]USBTXINTERVAL[15])
The USB host transmit interval endpoint n 8-bit registers (USBTXINTERVAL[n]), for interrupt and
isochronous transfers, define the polling interval for the currently selected transmit endpoint. For bulk
endpoints, this register defines the number of frames after which the endpoint should time out on receiving
a stream of NAK responses.
The USBTXINTERVAL[n] registers values define a number of frames, as follows:
Transfer Type
Interrupt
Isochronous
Bulk
For the specific offset for each register see
Mode(s): OTG A or Host
The USBTXINTERVAL[n] registers are shown in
Figure 18-52. USB Host Transmit Interval Endpoint n Register (USBTXINTERVAL[n])
7
LEGEND: R/W = Read/Write; -n = value after reset
Table 18-56. USB Host Transmit Interval Endpoint n Register(USBTXINTERVAL[n])
Bit Field Value
7-0 TXPOLL / 0
NAKLMT
SPRUHE8E – October 2012 – Revised November 2019
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Table 18-55. USBTXINTERVAL[n] Frame Numbers
Speed
Low-speed or Full-speed
Full-speed
Full-speed
TXPOLL / NAKLMT
Description
TX Polling / NAK Limit The polling interval for interrupt/isochronous transfers; the NAK limit for bulk
transfers. See Table 18-55
Copyright © 2012–2019, Texas Instruments Incorporated
Valid Values (m) Interpretation
0x01-0xFF The polling interval is m frames.
0x01-0x10 The polling interval is 2
The NAK Limit is 2
0x02-0x10
disables the NAK timeout function.
Table 18-4.
Figure 18-51 and described in
R/W-0
Field Descriptions
for valid entries; other values are reserved.
M3 Universal Serial Bus (USB) Controller
Register Descriptions
(m-1)
frames.
(m-1)
frames. A value of 0 or 1
Table 18-54.
0
1389