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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
642 of 1441
NXP Semiconductors
UM10503
Chapter 25: LPC43xx/LPC43Sxx USB0 Host/Device/OTG controller
25.4.3 USB acronyms and abbreviations
25.4.4 Transmit and receive buffers
The USB OTG controller contains a Transmit buffer to store data to be transmitted on the
USB and a Receive buffer to store data received from the USB. The Receive buffer
contains 256 words. The Transmit buffer contains 128 words for each endpoint in device
mode and 512 words in host mode.
25.4.5 Fixed endpoint configuration
shows the supported endpoint configurations. The Maximum Packet Size (see
) is dependent on the type of endpoint and the device configuration (low-speed,
full-speed, or high-speed).
Table 457. USB related acronyms
Acronym
Description
ATX
Analog Transceiver
DCD
Device Controller Driver
dQH
device Endpoint Queue Head
dTD
device Transfer Descriptor
EOP
End Of Packet
EP
End Point
FS
Full Speed
HCD
Host Controller Driver
HS
High Speed
LS Low
Speed
MPS
Maximum Packet Size
NAK
Negative Acknowledge
OTG
On-The-Go
PID
Packet Identifier
QH
Queue Head
SE0
Single Ended 0
SOF
Start Of Frame
TT
Transaction Translator
USB
Universal Serial Bus
Table 458. Fixed endpoint configuration
Logical
endpoint
Physical
endpoint
Endpoint type
Direction
0
0
Control
Out
0
1
Control
In
1
2
Interrupt/Bulk/Isochronous
Out
1
3
Interrupt/Bulk/Isochronous
In
2
4
Interrupt/Bulk/Isochronous
Out
2
5
Interrupt/Bulk/Isochronous
In
3
6
Interrupt/Bulk/Isochronous
Out