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UM10503
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User manual
Rev. 2.1 — 10 December 2015
752 of 1441
NXP Semiconductors
UM10503
Chapter 26: LPC43xx/LPC43Sxx USB1 Host/Device controller
Table 551. Port Status and Control register in device mode (PORTSC1_D - address 0x4000 7184) bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
CCS
Current connect status
0
RO
0
Device not attached
A zero indicates that the device did not attach successfully or was forcibly
disconnected by the software writing a zero to the Run bit in the USBCMD
register. It does not state the device being disconnected or suspended.
1
Device attached.
A one indicates that the device successfully attached and is operating in
either high-speed mode or full-speed mode as indicated by the High Speed
Port bit in this register.
1
CSC
-
Not used in device mode
0
-
2
PE
1
Port enable.
This bit is always 1. The device port is always enabled.
1
RO
3
PEC
0
Port enable/disable change
This bit is always 0. The device port is always enabled.
0
RO
5:4
-
-
Reserved
0
RO
6
FPR
Force port resume
After the device has been in Suspended state for 5 ms or more, software
must set this bit to one to drive resume signaling before clearing. The
Device Controller will set this bit to one if a J-to-K transition is detected
while the port is in the Suspended state. The bit will be cleared when the
device returns to normal operation. When this bit transitions to a one
because a J-to-K transition detected, the Port Change Detect bit in the
USBSTS register is set to one as well.
0
R/W
0
No resume (K-state) detected/driven on port.
1
Resume detected/driven on port.
7
SUSP
Suspend
In device mode, this is a read-only status bit .
0
RO
0
Port not in Suspended state
1
Port in Suspended state
8
PR
Port reset
In device mode, this is a read-only status bit. A device reset from the USB
bus is also indicated in the USBSTS register.
0
RO
0
Port is not in the reset state.
1
Port is in the reset state.
9
HSP
High-speed status
Remark:
This bit is redundant with bits 27:26 (PSPD) in this register. It is
implemented for compatibility reasons.
0
RO
0
Host/device connected to the port is not in High-speed mode.
1
Host/device connected to the port is in High-speed mode.
11:10 LS
-
Not used in device mode.
12
PP
-
Not used in device mode.
13
-
-
Reserved
-
-