UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
535 of 1269
NXP Semiconductors
UM10503
Chapter 23: LPC43xx USB0 Host/Device/OTG controller
23.6.16 OTG Status and Control register (OTGSC)
The OTG register has four sections:
•
OTG interrupt enables (R/W)
•
OTG Interrupt status (R/WC)
•
OTG status inputs (RO)
•
OTG controls (R/W)
22
WKOC
Wake on over-current enable (WKOC_E)
0
R/W
0
Disables the port to wake up on over-current events.
1
Writing a one to this bit enabled the port to be sensitive to over-current
conditions as wake-up events.
23
PHCD
PHY low power suspend - clock disable (PLPSCD)
In host mode, the PHY can be put into Low Power Suspend – Clock
Disable when the downstream device has been put into suspend mode or
when no downstream device is connected. Low power suspend is
completely under the control of software.
0
R/W
0
Writing a 0 enables the PHY clock. Reading a 0 indicates the status of the
PHY clock (enabled).
1
Writing a 1 disables the PHY clock. Reading a 1 indicates the status of the
PHY clock (disabled).
24
PFSC
Port force full speed connect
0
R/W
0
Port connects at any speed.
1
Writing this bit to a 1 will force the port to only connect at Full Speed. It
disables the chirp sequence that allows the port to identify itself as High
Speed. This is useful for testing FS configurations with a HS host, hub or
device.
25
-
-
Reserved
27:26 PSPD
Port speed
This register field indicates the speed at which the port is operating. For HS
mode operation in the host controller and HS/FS operation in the device
controller the port routing steers data to the Protocol engine. For FS and
LS mode operation in the host controller, the port routing steers data to the
Protocol Engine w/ Embedded Transaction Translator.
0
RO
0x0
Full-speed
0x1
Low-speed
0x2
High-speed
31:28 -
Reserved
-
-
Table 420. Port Status and Control register in host mode (PORTSC1_H - address 0x4000 6184) bit description
Bit
Symbol
Value
Description
Reset
value
Access
Table 421. Port states as described by the PE and SUSP bits in the PORTSC1 register
PE bit
SUSP bit
Port state
0
0 or 1
disabled
1
0
enabled
1
1
suspend