Cypress CY7C65113C manual USB Mode Tables, Setup OUT

CY7C65113C

18.0USB Mode Tables

Table 18-1. USB Register Mode Encoding

Moder	Mode	SETUP	IN	OUT	Comments
	Bits
Disable	0000	ignore	ignore	ignore	Ignore all USB traffic to this endpoint
Nak In/Out	0001	accept	NAK	NAK	Forced from Setup on Control endpoint, from modes other than 0000
Status Out Only	0010	accept	stall	check	For Control endpoints
Stall In/Out	0011	accept	stall	stall	For Control endpoints
Ignore In/Out	0100	accept	ignore	ignore	For Control endpoints
Isochronous Out	0101	ignore	ignore	always	For Isochronous endpoints
Status In Only	0110	accept	TX 0 Byte	stall	For Control Endpoints
Isochronous In	0111	ignore	TX Count	ignore	For Isochronous endpoints
Nak Out	1000	ignore	ignore	NAK	Is set by SIE on an ACK from mode 1001 (Ack Out)
Ack Out(STALL[6]=0)	1001	ignore	ignore	ACK	On issuance of an ACK this mode is changed by SIE to 1000 (NAK
Ack Out(STALL[6]=1)	1001	ignore	ignore	stall	Out)
Nak Out - Status In	1010	accept	TX 0 Byte	NAK	Is set by SIE on an ACK from mode 1011 (Ack Out – Status In)
Ack Out - Status In	1011	accept	TX 0 Byte	ACK	On issuance of an ACK this mode is changed by SIE to 1010 (NAK
					Out – Status In)
Nak In	1100	ignore	NAK	ignore	Is set by SIE on an ACK from mode 1101 (Ack In)
Ack IN(STALL[6]=0)	1101	ignore	TX Count	ignore	On issuance of an ACK this mode is changed by SIE to 1100 (NAK In)
Ack IN(STALL[6]=1)	1101	ignore	stall	ignore
Nak In - Status Out	1110	accept	NAK	check	Is set by SIE on an ACK from mode 1111 (Ack In – Status Out)
Ack In - Status Out	1111	accept	TX Count	check	On issuance of an ACK this mode is changed by SIE to 1110 (NAK In
					– Status Out)
Mode

This lists the mnemonic given to the different modes that can be set in the Endpoint Mode Register by writing to the lower nibble (bits 0..3). The bit settings for different modes are covered in the column marked “Mode Bits”. The Status IN and Status OUT represent the Status stage in the IN or OUT transfer involving the control endpoint.

Mode Bits

These column lists the encoding for different modes by setting Bits[3..0] of the Endpoint Mode register. This modes represents how the SIE responds to different tokens sent by the host to an endpoint. For instance, if the mode bits are set to “0001” (NAK IN/OUT), the SIE will respond with an

•ACK on receiving a SETUP token from the host.

•NAK on receiving an OUT token from the host.

•NAK on receiving an IN token from the host.

Refer to Section 13.0 for more information on the SIE functioning.

SETUP, IN, and OUT

These columns shows the SIE’s response to the host on receiving a SETUP, IN and OUT token depending on the mode set in the Endpoint Mode Register.

A “Check” on the OUT token column, implies that on receiving an OUT token the SIE checks to see whether the OUT packet is of zero length and has a Data Toggle (DTOG) set to ‘1.’ If the DTOG bit is set and the received OUT Packet has zero length, the OUT is ACKed to complete the transaction. If either of this condition is not met the SIE will respond with a STALLL or just ignore the transaction.

A “TX Count” entry in the IN column implies that the SIE transmit the number of bytes specified in the Byte Count (bits 3..0 of the Endpoint Count Register) to the host in response to the IN token received.

A “TX0 Byte” entry in the IN column implies that the SIE transmit a zero length byte packet in response to the IN token received from the host.

An “Ignore” in any of the columns means that the device will not send any handshake tokens (no ACK) to the host.

An “Accept” in any of the columns means that the device will respond with an ACK to a valid SETUP transaction to the host.

Note:

6.STALL bit is bit 7 of the USB Non-control Device Endpoint Mode registers. For more information, refer to Section 17.4.

Document #: 38-08002 Rev. *D Page 39 of 49

[+] Feedback