Texas Instruments OMAP5912 Reference Manual page 1490

USB OTG Controller
Table 59. OTG System Configuration Register 1 (OTG_SYSCON_1) (Continued)
Bit Name
15 OTG_IDLE_EN
14 HST_IDLE_EN
13 DEV_IDLE_EN
12:3 Reserved
† See Table 60, Pin Group 2 Transceiver Type Selection.
‡ See Table 61, Pin Group 1 Transceiver Type Selection.
§ See Table 62, Pin Group 0 Transceiver Type Selection and Table 63, Alternate Pin Group 2 Transceiver Type Selection
198 Universal Serial Bus (USB)
Description
OTG controller clock-gating control. This bit disables the clock to the OTG
controller.
0: The OTG controller clock is not gated. Register settings in the ULPD
can prevent the USB OTG controller from getting a clock even if this bit
is 0.
1: The OTG controller is idled by disabling the OTG controller. Accesses to
OTG controller registers are allowed, but the OTG controller clock is not
gated.
This register is cleared 0 by soft reset or hardware reset. For more
information about the power saving circuitry, see Section 4.2.2.
0 − Host power management circuitry disabled
1 − Host power management circuitry enabled
Device controller clock-gating control. This bit defines the device
power-saving circuitry.
0: The USB device controller clock is not gated. Other registers in
OMAP5912 can prevent the USB device controller from getting a clock
even if this bit is 0.
1: The USB device controller clock is disabled if the USB device controller
does not need an active clock (such as when the USB device controller is
in susped). Accesses to USB device controller registers are allowed, but
the USB device controller state machines does not function.
If the USB device controller sees USB resume signaled when
DEV_IDLE_EN is 1, a USB device controller general interrupt is
generated. The interrupt service routine must clear DEV_IDLE_EN before
performing the operations necessary to service the interrupt.
This register is set to1 by soft reset or hardware reset. For more
information about the USB device controller, see Section 3, USB Device
Controller.
Reserved
SPRU761A