ST STM32F423 Reference Manual page 1186

USB on-the-go full-speed (OTG_FS)
Bits 14:13 LPMRST[1:0]: LPM response
Bit 12 L1DSEN: L1 deep sleep enable
Bits11:8 BESLTHRS[3:0]: BESL threshold
Bit 7 L1SSEN: L1 Shallow Sleep enable
Bit 6 REMWAKE: bRemoteWake value
1186/1324
Device mode:
The response of the core to LPM transaction received is reflected in these two bits.
Host mode:
Handshake response received from local device for LPM transaction
11: ACK
10: NYET
01: STALL
00: ERROR (No handshake response)
Enables suspending the PHY in L1 Sleep mode. For maximum power saving during L1
Sleep mode, this bit should be set to '1' by application SW in all the cases.
Device mode:
The core puts the PHY into deep low power mode in L1 when BESL value is greater than or
equal to the value defined in this field BESL_Thres[3:0].
Host mode:
The core puts the PHY into deep low power mode in L1. BESLTHRS[3:0] specifies the time
for which resume signaling is to be reflected by host (T
when it detects device initiated resume.
BESLTHRS must not be programmed with a value greater than 1100b in host mode,
because this exceeds maximum T
Thres[3:0] host mode resume signaling time (μs):
0000: 75
0001: 100
0010: 150
0011: 250
0100: 350
0101: 450
0110: 950
All other values: reserved
Enables suspending the PHY in L1 Sleep mode. For maximum power saving during L1
Sleep mode, this bit should be set to '1' by application SW in all the cases.
Host mode:
The value of remote wake up to be sent in the wIndex field of LPM transaction.
Device mode (read-only):
This field is updated with the received LPM token bRemoteWake bmAttribute when an ACK,
NYET, or STALL response is sent to an LPM transaction.
L1HubDrvResume2
RM0430 Rev 8
) on the USB bus
L1HubDrvResume2
.
RM0430