Altera cyclone V Technical Reference page 2893

cv_5v4
2016.10.28
Bit
17
naksts
16
dpid
USB 2.0 OTG Controller
Send Feedback
Name
When either the application or the core sets this bit:
-The core stops receiving any data on an OUT
endpoint, even if there is space in the RxFIFO to
accommodate the incoming packet. -for non-isochro‐
nous IN endpoints: The core stops transmitting any
data on an IN endpoint, even if there data is available
in the TxFIFO. -for isochronous IN endpoints: The
core sends out a zero-length data packet, even if there
data is available in the TxFIFO. Irrespective of this
bit's setting, the core always responds to SETUP data
packets with an ACK handshake.
Value
0x0
0x1
Applies to interrupt/bulk IN and OUT endpoints
only. Contains the PID of the packet to be received or
transmitted on this endpoint. The application must
program the PID of the first packet to be received or
transmitted on this endpoint, after the endpoint is
activated. The applications use the SetD1PID and
SetD0PID fields of this register to program either
DATA0 or DATA1 PID. 0: DATA0 1: DATA1This field
is applicable both for Scatter/Gather DMA mode and
non-Scatter/Gather DMA mode. Even/Odd (Micro)
Frame (EO_FrNum) In non-Scatter/Gather DMA
mode: Applies to isochronous IN and OUT endpoints
only. Indicates the (micro)frame number in which the
core transmits/receives isochronous data for this
endpoint. The application must program the even/
odd (micro) frame number in which it intends to
transmit/receive isochronous data for this endpoint
using the SetEvnFr and SetOddFr fields in this
register. 0: Even (micro)frame 1: Odd (micro)frame
When Scatter/Gather DMA mode is enabled, this
field is reserved. The frame number in which to send
data is provided in the transmit descriptor structure.
The frame in which data is received is updated in
receive descriptor structure.
Value
0x0
0x1
Description
Description
The core is transmitting non-NAK
handshakes based on the FIFO status
The core is transmitting NAK handshakes on
this endpoint
Description
Endpoint Data PID not active
Endpoint Data PID active
18-803
doepctl13
Access Reset
RO 0x0
RO 0x0
Altera Corporation