DOEPCTL0

         Device Control OUT Endpoint 0 Control Register

Module Instance	Base Address	Register Address
`i_usbotg_0_DWC_otg_intreg`	`0xFFB00000`	`0xFFB00B00`
`i_usbotg_1_DWC_otg_intreg`	`0xFFB40000`	`0xFFB40B00`

Size: 32

Offset: 0xB00

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
`EPEna` `RW 0x0`	`EPDis` `RO 0x0`	`RESERVED` `RO 0x0`		`SNAK` `WO 0x0`	`CNAK` `WO 0x0`	`RESERVED1` `RO 0x0`				`Stall` `RW 0x0`	`Snp` `RW 0x0`	`EPType` `RO 0x0`		`NAKSts` `RO 0x0`	`RESERVED2` `RO 0x0`
15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
`USBActEP` `RO 0x1`	`RESERVED3` `RO 0x0`													`MPS` `RO 0x0`

DOEPCTL0 Fields

Bit

Name

Description

Access

Reset

EPEna

Endpoint Enable (EPEna)
 When Scatter/Gather DMA mode is enabled, For OUT
endpoints this bit indicates that the descriptor structure and
data buffer to receive data is setup.
 When Scatter/Gather DMA mode is disabled(such as For
buffer-pointer based DMA mode)this bit indicates that the
application has allocated the memory to start receiving data
from the USB.
The core clears this bit before setting any of the following
interrupts on this endpoint:
 SETUP Phase Done
 Endpoint Disabled
 Transfer Completed
Note: In DMA mode, this bit must be Set For the core to transfer
SETUP data packets into memory.

Value	Description
0x0	No action
0x1	Enable Endpoint

RW

0x0

EPDis

Endpoint Disable (EPDis)
The application cannot disable control OUT endpoint 0.

Value	Description
0x0	No Endpoint disable

RO

0x0

29:28

RESERVED

RESERVED

RO

0x0

SNAK

Set NAK (SNAK)
A write to this bit sets the NAK bit For the endpoint.
Using this bit, the application can control the transmission of
NAK handshakes on an endpoint. The core can also Set bit on a
Transfer Completed interrupt, or after a SETUP is received on
the endpoint.

Value	Description
0x0	No action
0x1	Set NAK

WO

0x0

CNAK

Clear NAK (CNAK)
A write to this bit clears the NAK bit For the endpoint.

Value	Description
0x0	No action
0x1	Clear NAK

WO

0x0

25:22

RESERVED1

RESERVED

RO

0x0

Stall

STALL Handshake (Stall)
The application can only Set this bit, and the core clears it, when
a SETUP token is received For this endpoint. If a NAK bit or
Global OUT NAK is Set along with this bit, the STALL bit takes
priority. Irrespective of this bit's setting, the core always
responds to SETUP data packets with an ACK handshake.

Value	Description
0x0	No Stall
0x1	Stall Handshake

RW

0x0

Snp

Snoop Mode (Snp)
This bit configures the endpoint to Snoop mode. In Snoop mode,
the core does not check the correctness of OUT packets before
transferring them to application memory.

Value	Description
0x0	Snoop Mode disabled
0x1	Snoop Mode enabled

RW

0x0

19:18

EPType

Endpoint Type (EPType)
Hardcoded to 2'b00 For control.

Value	Description
0x0	Endpoint Control 0

RO

0x0

NAKSts

NAK Status (NAKSts)
Indicates the following:
 1'b0: The core is transmitting non-NAK handshakes based
on the FIFO status.
 1'b1: The core is transmitting NAK handshakes on this
endpoint.
When either the application or the core sets this bit, the core
stops receiving data, even If there is space in the RxFIFO to
accommodate the incoming packet. Irrespective of this bit's
setting, the core always responds to SETUP data packets with
an ACK handshake.

Value	Description
0x0	The core is transmitting non-NAK handshakes based on the FIFO status
0x1	The core is transmitting NAK handshakes on this endpoint

RO

0x0

RESERVED2

RESERVED

RO

0x0

USBActEP

USB Active Endpoint (USBActEP)
This bit is always Set to 1, indicating that a control endpoint 0 is
always active in all configurations and interfaces.

Value	Description
0x1	USB Active Endpoint 0

RO

0x1

14:2

RESERVED3

RESERVED

RO

0x0

1:0

MPS

Maximum Packet Size (MPS)
The maximum packet size For control OUT endpoint 0 is the
same as what is programmed in control IN Endpoint 0.
 2'b00: 64 bytes
 2'b01: 32 bytes
 2'b10: 16 bytes
 2'b11: 8 bytes

Value	Description
0x0	64 bytes
0x1	32 bytes
0x2	16 bytes
0x3	8 bytes

RO

0x0