USB on-the-go full-speed (OTG_FS) RM0351
1656/1830 DocID024597 Rev 5
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res.
FD
MOD
FH
MOD
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
rw rw
1514131211109876543210
Res. Res. TRDT
HNP
CAP
SRP
CAP
Res.
PHY
SEL
Res. Res. Res. TOCAL
rw rw rw r rw
Bit 31 Reserved, must be kept at reset value.
Bit 30 FDMOD: Force device mode
Writing a 1 to this bit, forces the core to device mode irrespective of the OTG_ID input pin.
0: Normal mode
1: Force device mode
After setting the force bit, the application must wait at least 25 ms before the change takes
effect.
Note: Accessible in both device and host modes.
Bit 29 FHMOD: Force host mode
Writing a 1 to this bit, forces the core to host mode irrespective of the OTG_ID input pin.
0: Normal mode
1: Force host mode
After setting the force bit, the application must wait at least 25 ms before the change takes
effect.
Note: Accessible in both device and host modes.
Bits 28:26 Reserved, must be kept at reset value for USB OTG HS and FS
Bits 25:15 Reserved, must be kept at reset value for USB OTG FS
Bit 14 Reserved, must be kept at reset value.
Bits 13:10 TRDT: USB turnaround time
These bits allows to set the turnaround time in PHY clocks. They must be configured
according to Table 307: TRDT values(FS), depending on the application AHB frequency.
Higher TRDT values allow stretching the USB response time to IN tokens in order to
compensate for longer AHB read access latency to the Data FIFO.
Note: Only accessible in device mode.
Bit 9 HNPCAP: HNP-capable
The application uses this bit to control the
OTG_FS controller’s HNP capabilities.
0: HNP capability is not enabled.
1: HNP capability is enabled.
Note: Accessible in both device and host modes.
Bit 8 SRPCAP: SRP-capable
The application uses this bit to control the
OTG_FS controller’s SRP capabilities. If the core
operates as a non-SRP-capable
B-device, it cannot request the connected A-device (host) to activate V
BUS
and start a
session.
0: SRP capability is not enabled.
1: SRP capability is enabled.
Note: Accessible in both device and host modes.
Bit 7 Reserved, must be kept at reset value.
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