Texas Instruments OMAP5912 Reference Manual page 1498

USB OTG Controller
Table 64. OTG System Configuration Register 2 (OTG_SYSCON_2) (Continued)
Bit Name
14 SRP_DPW
13 SRP_DATA
12 SRP_VBUS
11 Reserved
† See Table 65, OTG_PADEN Source Status.
‡ See Table 66, HMC_PADEN: USB Signal Multiplexing Control Source.
206 Universal Serial Bus (USB)
Description
Session request protocol detection—pulse width. This bit selects the width
for the SRP detection when acting as a default-A OTG dual-role device.
This value applies on both DATA and VBUS pulsing detections.
0: SRP pulse must be greater than 1 ms (nominal) to be sensed as a valid
D+, D−, or VBUS SRP pulse.
1: SRP pulse must be greater than 167 ns (nominal) to be sensed as a
valid D+, D−, or VBUS SRP pulse.
This register is cleared 0 by soft reset or hardware reset. This bit has no
effect when the OTG feature is disabled (OTG_SYSCON_2.OTG_EN = 0).
Session request protocol detection—data pulsing detection enable. This bit
determines whether the OMAP5912 OTG controller considers D+ or D−
pulses as SRP requests.
0: OTG controller does not consider D+ or D− pulses as SRP requests.
1: OTG controller treats a D+ or D− pulse of appropriate minimum duration
as an SRP request.
This register is cleared 0 by soft reset or hardware reset.
This register is used only when the OMAP5912 OTG controller acts as a
default-A dual-role device. SRP detection requires that either
OTG_SYSCON_2.SRP_DATA or OTG_SYSCON_2.SRP_VBUS (or both)
is set.
Session request protocol detection—VBUS pulsing detection enable.This
bit determines whether the OMAP5912 OTG controller considers VBUS
pulses as SRP requests.
0: OTG controller does not consider VBUS pulses as SRP requests.
1: OTG controller treats a VBUS pulse of appropriate minimum duration as
an SRP request.
This register is cleared 0 by soft reset or hardware reset.
This register is only used when the OMAP5912 OTG controller acts as a
default-A dual-role-device. SRP detection requires that either
OTG_SYSCON_2.SRP_DATA or OTG_SYSCON_2.SRP_VBUS (or both)
is set.
Reserved
SPRU761A