USB on-the-go full-speed (OTG_FS) RM0351
1544/1693 DocID024597 Rev 3
43.15.14 OTG core LPM configuration register (OTG_GLPMCFG)
Address offset: 0x54
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res.
EN
BESL
LPMRCNTSTS
SND
LPM
LPMRCNT LPMCHIDX
L1RSM
OK
rw r r r rsrwrwrwrwrwrwrw r
1514131211109876543210
SLP
STS
LPMRSP
L1DS
EN
BESLTHRS
L1SS
EN
REM
WAKE
BESL
LPM
ACK
LPM
EN
r r r rw rw rw rw rw rw rw/r rw/r rw/r rw/r rw/r rw rw
Bits 31:29 Reserved, must be kept at reset value.
Bit 28 ENBESL: Enable best effort service latency
This bit enables the BESL feature as defined in the LPM errata:
0:The core works as described in the following document:
USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB 2.0
specification, July 16, 2007
1:The core works as described in the LPM Errata:
Errata for USB 2.0 ECN: Link Power Management (LPM) - 7/2007
Note: Only the updated behavior (described in LPM Errata) is considered in this document
and so the ENBESL bit should be set to '1' by application SW.
Bits 27:25 LPMRCNTSTS: LPM retry count status
Number of LPM host retries still remaining to be transmitted for the current LPM sequence.
Note: Accessible only in host mode.
Bit 24 SNDLPM: Send LPM transaction
When the application software sets this bit, an LPM transaction containing two tokens, EXT
and LPM is sent. The hardware clears this bit once a valid response (STALL, NYET, or
ACK) is received from the device or the core has finished transmitting the programmed
number of LPM retries.
Note: This bit must be set only when the host is connected to a local port.
Note: Accessible only in host mode.
Bits 23:21 LPMRCNT: LPM retry count
When the device gives an ERROR response, this is the number of additional LPM retries
that the host performs until a valid device response (STALL, NYET, or ACK) is received.
Note: Accessible only in host mode.
Bits 20:17 LPMCHIDX: LPM Channel Index
The channel number on which the LPM transaction has to be applied while sending an LPM
transaction to the local device. Based on the LPM channel index, the core automatically
inserts the device address and endpoint number programmed in the corresponding channel
into the LPM transaction.
Note: Accessible only in host mode.
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