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UM10503
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User manual
Rev. 1.3 — 6 July 2012
609 of 1269
NXP Semiconductors
UM10503
Chapter 24: LPC43xx USB1 Host/Device controller
24.6.12 BINTERVAL register
This register defines the bInterval value which determines the length of the virtual frame
(see
Remark:
The BINTERVAL register is not related to the bInterval endpoint descriptor field
in the USB specification.
24.6.13 USB Endpoint NAK register (ENDPTNAK)
24.6.13.1 Device mode
This register indicates when the device sends a NAK handshake on an endpoint. Each Tx
and Rx endpoint has a bit in the EPTN and EPRN field respectively.
A bit in this register is cleared by writing a 1 to it.
29
ULPIRW
ULPI Read/Write control. This bit selects between running a read or
write operation.
R/W
0
0
Read
1
Write
30
ULPIRUN
ULPI Read/Write Run.
Writing the 1 to this bit will begin the read/write operation. The bit will
automatically transition to 0 after the read/write is complete. Once
this bit is set, the driver can not set it back to 0.
Remark:
The driver must never execute a wake-up and a read/write
operation at the same time.
R/W
-
31
ULPIWU
ULPI Wake-up.
Writing the 1 to this bit will begin the wake-up operation. The bit will
automatically transition to 0 after the wake-up is complete. Once this
bit is set, the driver can not set it back to 0.
Remark:
The driver must never execute a wake-up and a read/write
operation at the same time.
R/W
0
Table 477. USB ULPI viewport register (ULPIVIEWPORT - address 0x4000 7170) bit description
…continued
Bit
Symbol
Value
Description
Access
Reset
value
Table 478. USB BINTERVAL register (BINTERVAL - address 0x4000 7174) bit description in device/host mode
Bit
Symbol
Description
Reset
value
Access
3:0
BINT
bInterval value
0x00
R/W
31:4
-
Reserved
-
-