Cypress specifications CY7C68300C/CY7C68301C CY7C68320C/CY7C68321C, Interface Descriptor

CY7C68300C/CY7C68301C

CY7C68320C/CY7C68321C

Table 11.Configuration Data Organization (continued)

	Byte	Configuration	Configuration	Required	Variable
	Address	Item Name	Item Description	Contents	Contents
	0x32	iConfiguration	Index to the configuration string. This entry must equal half		0x00
			of the address value where the string starts, or 0x00 if the
			string does not exist.
	0x33	bmAttributes	Device attributes for this configuration		0xC0
			Bit 7 Reserved. Must be set to 1
			Bit 6 Self-powered. See Table 4 for reported value
			Bit 5 Remote wakeup. Must be set to 0
			Bits 4–0 Reserved. Must be set to 0
	0x34	bMaxPower	Maximum power consumption for this configuration. Units		0x01
			used are mA*2 (i.e., 0x31 = 98 mA, 0xF9 = 498 mA). The
			value entered here is only used by the 56-pin packages and
			affect the reported value of bit 6 of address 0x33 in that case.
			See Table 4 on page 14 for a description of what value is
			reported to the host by the AT2LP.
	Interface and Endpoint Descriptors
	Interface Descriptor
	0x35	bLength	Length of interface descriptor in bytes	0x09
	0x36	bDescriptorType	Descriptor type	0x04
	0x37	bInterfaceNumber	Interface number	0x00
	0x38	bAlternateSetting	Alternate setting	0x00
	0x39	bNumEndpoints	Number of endpoints		0x02
	0x3A	bInterfaceClass	Interface class	0x08
	0x3B	bInterfaceSubClass	Interface subclass		0x06
	0x3C	bInterfaceProtocol	Interface protocol	0x50
	0x3D	iInterface	Index to first interface string. This entry must equal half of		0x00
			the address value where the string starts or 0x00 if the string
			does not exist.
	USB Bulk Out Endpoint
	0x3E	bLength	Length of this descriptor in bytes	0x07
	0x3F	bDescriptorType	Endpoint descriptor type	0x05
	0x40	bEndpointAddress	This is an Out endpoint, endpoint number 2.	0x02
	0x41	bmAttributes	This is a bulk endpoint.	0x02
	0x42	wMaxPacketSize (LSB)	Max data transfer size. To be set by speed (Full-speed		0x00
			0x0040; High-speed 0x0200)
	0x43	wMaxPacketSize (MSB)			0x02
	0x44	bInterval	High-speed interval for polling (maximum NAK rate)	0x00
	USB Bulk In Endpoint
	0x45	bLength	Length of this descriptor in bytes	0x07
	0x46	bDescriptorType	Endpoint descriptor type	0x05
	0x47	bEndpointAddress	This is an In endpoint, endpoint number 6	0x86
	0x48	bmAttributes	This is a bulk endpoint	0x02
	0x49	wMaxPacketSize (LSB)	Max data transfer size. Automatically set by AT2 (Full-speed		0x00
			0x0040; High-speed 0x0200)
	0x4A	wMaxPacketSize (MSB)			0x02
	0x4B	bInterval	High-speed interval for polling (maximum NAK rate)	0x00
	(Optional)	HID Interface Descriptor
	0x4C	bLength	Length of HID interface descriptor		0x09
	0x4D	bDescriptorTypes	Interface descriptor type		0x04
	0x4E	bInterfaceNumber	Number of interfaces (2)		0x02
Document 001-05809 Rev. *A				Page 27 of 42

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