doeptsiz12

         Device OUT Endpoint 12 Transfer Size Register
      
Module Instance Base Address Register Address
i_usbotg_0_devgrp 0xFFB00800 0xFFB00C90
i_usbotg_1_devgrp 0xFFB40800 0xFFB40C90

Offset: 0x490

Access: RW

Important: The value of a reserved bit must be maintained in software. When you modify registers containing reserved bit fields, you must use a read-modify-write operation to preserve state and prevent indeterminate system behavior.
Bit Fields
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

Reserved

rxdpid

RO 0x0

pktcnt

RW 0x0

xfersize

RW 0x0

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

xfersize

RW 0x0

doeptsiz12 Fields

Bit Name Description Access Reset
30:29 rxdpid
 Applies to isochronous OUT endpoints only.
This is the data PID received in the last packet for this endpoint.
 2'b00: DATA0
 2'b01: DATA2
 2'b10: DATA1
 2'b11: MDATA
 
SETUP Packet Count (SUPCnt)
Applies to control OUT Endpoints only.
This field specifies the number of back-to-back SETUP data
packets the endpoint can receive.
 2'b01: 1 packet
 2'b10: 2 packets
 2'b11: 3 packets
Value Description
0x0 DATA0
0x1 DATA2PACKET1
0x2 DATA1PACKET2
0x3 MDATAPACKET3
RO 0x0
28:19 pktcnt
Packet Count (PktCnt)
This field is decremented to zero after a packet is written into the
RxFIFO.
RW 0x0
18:0 xfersize
Transfer Size (XferSize)
Indicates the transfer size in bytes For endpoint 0. The core
interrupts the application only after it has exhausted the transfer
size amount of data. The transfer size can be Set to the
maximum packet size of the endpoint, to be interrupted at the
end of each packet.
The core decrements this field every time a packet is read from
the RxFIFO and written to the external memory.
RW 0x0