DIEPCTL0

Address offset: 0x900

Device Control IN Endpoint 0 Control Register

This register is used to control the characteristics of the IN Endpoint 0 of the Device controller.


Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				J	I			H	G	F	F	F	F	E		D	D	C		B														A	A
Reset 0x00008000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	MPS										Maximum Packet Size (MPS) Applies to IN and OUT endpoints. The application must program this field with the maximum packet size for the current logical endpoint.
			BYTES64	0								64 bytes
			BYTES32	1								32 bytes
			BYTES16	2								16 bytes
			BYTES8	3								8 bytes
B	R	USBACTEP										USB Active Endpoint (USBActEP) This bit is always SET to 1, indicating that control endpoint 0 is always active in all configurations and interfaces.
			ACTIVE0	1								Control endpoint is always active
C	R	NAKSTS										NAK Status (NAKSts) Indicates the following: When this bit is set, either by the application or core, the core stops transmitting data, even If there is data available in the TxFIFO. Irrespective of this bit's setting, the core always responds to SETUP data packets with an ACK handshake.
			INACTIVE	0								The core is transmitting non-NAK handshakes based on the FIFO status
			ACTIVE	1								The core is transmitting NAK handshakes on this endpoint
D	R	EPTYPE										Endpoint Type (EPType) Hardcoded to 00 for control.
			ACTIVE	0								Endpoint Control 0
E	RW	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, Global Nonperiodic IN NAK, or Global OUT NAK is set along with this bit, the STALL bit takes priority.
			INACTIVE	0								No Stall
			ACTIVE	1								Stall Handshake
F	RW	TXFNUM										TxFIFO Number (TxFNum) - For Shared FIFO operation, this value is always set to 0, indicating that control IN endpoint 0 data is always written in the Non-Periodic Transmit FIFO. - For Dedicated FIFO operation, this value is set to the FIFO number that is assigned to IN Endpoint.
			TXFIFO0	0								Tx FIFO 0
			TXFIFO1	1								Tx FIFO 1
			TXFIFO2	2								Tx FIFO 2
			TXFIFO3	3								Tx FIFO 3
			TXFIFO4	4								Tx FIFO 4
			TXFIFO5	5								Tx FIFO 5
			TXFIFO6	6								Tx FIFO 6
			TXFIFO7	7								Tx FIFO 7
			TXFIFO8	8								Tx FIFO 8
			TXFIFO9	9								Tx FIFO 9
			TXFIFO10	10								Tx FIFO 10
			TXFIFO11	11								Tx FIFO 11
			TXFIFO12	12								Tx FIFO 12
			TXFIFO13	13								Tx FIFO 13
			TXFIFO14	14								Tx FIFO 14
			TXFIFO15	15								Tx FIFO 15
G	W	CNAK										Clear NAK (CNAK) A write to this bit clears the NAK bit for the endpoint.
			NOCLEAR	0								No action
			CLEAR	1								Clear NAK
H	W	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 this bit for an endpoint after a SETUP packet is received on that endpoint.
			NOSET	0								No action
			SET	1								Set NAK
I	RW	EPDIS										Endpoint Disable (EPDis) The application sets this bit to stop transmitting data on an endpoint, even before the transfer for that endpoint is complete. The application must wait for the Endpoint Disabled interrupt before treating the endpoint as disabled. The core clears this bit before setting the Endpoint Disabled Interrupt. The application must Set this bit only if Endpoint Enable is already set for this endpoint.
			INACTIVE	0								No action
			ACTIVE	1								Disabled Endpoint
J	RW	EPENA										Endpoint Enable (EPEna) When Scatter/Gather DMA mode is enabled for IN endpoints, this bit indicates that the descriptor structure and data buffer with data ready to transmit is setup. When Scatter/Gather DMA mode is disabled (such as in buffer pointer based DMA mode) this bit indicates that data is ready to be transmitted on the endpoint. The core clears this bit before setting the following interrupts on this endpoint: - Endpoint Disabled - Transfer Completed
			INACTIVE	0								No action
			ACTIVE	1								Enable Endpoint