USB on-the-go full-speed (OTG_FS) RM0351
1542/1693 DocID024597 Rev 3
43.15.12 OTG general core configuration register (OTG_GCCFG)
Address offset: 0x038
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. VBDEN SDEN PDEN
DCD
EN
BCDEN
PWR
DWN
rw rw rw rw rw rw
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
PS2
DET
SDET PDET DCDET
rw rw rw rw
Bits 31:22 Reserved, must be kept at reset value.
Bit 21 VBDEN: USB V
BUS
detection enable
Enables V
BUS
sensing comparators to detect V
BUS
valid levels on the V
BUS
PAD for USB
host and device operation. If HNP and/or SRP support is enabled, V
BUS
comparators are
automatically enabled independently of VBDEN value.
0 = V
BUS
Detection Disabled
1 = V
BUS
Detection Enabled
Bit 20 SDEN: Secondary detection (SD) mode enable
This bit is set by the software to put the BCD into SD mode. Only one detection mode (DCD,
PD, SD or OFF) should be selected to work correctly
Bit 19 PDEN: Primary detection (PD) mode enable
This bit is set by the software to put the BCD into PD mode. Only one detection mode (DCD,
PD, SD or OFF) should be selected to work correctly.
Bit 18 DCDEN: Data contact detection (DCD) mode enable
This bit is set by the software to put the BCD into DCD mode. Only one detection mode
(DCD, PD, SD or OFF) should be selected to work correctly.
Bit 17 BCDEN: Battery charging detector (BCD) enable
This bit is set by the software to enable the BCD support within the USB device. When
enabled, the USB PHY is fully controlled by BCD and cannot be used for normal
communication. Once the BCD discovery is finished, the BCD should be placed in OFF
mode by clearing this bit to ‘0’ in order to allow the normal USB operation.
Bit 16 PWRDWN: Power down control
Used to activate the transceiver in transmission/reception. When reset, the transceiver is
kept in power-down. When set, the BCD function must be off (BCDEN=0).
0 = USB FS transceiver disabled
1 = USB FS transceiver enabled
Bits 15:4 Reserved, must be kept at reset value.
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