CY7C68300B/CY7C68301B
CY7C68320/CY7C68321
Table 8-6. EEPROM Organization (continued)
EEPROM
Required Suggested
Contents Contents
Address
Field Name
bReserved
Field Description
0x2B
Reserved for future use. Must be set to zero.
0x00
Configuration Descriptor
0x2C
0x2D
0x2E
0x2F
bLength
Length of configuration descriptor in bytes.
Descriptor type.
0x09
0x02
0x20
0x00
bDescriptorType
bTotalLength (LSB)
bTotalLength (MSB)
Number of bytes returned in this configuration. This includes
the configuration descriptor plus all the interface and
endpoint descriptors.
0x30
0x31
bNumInterfaces
Number of interfaces supported.
0x01
0x00
bConfiguration Value
The value to use as an argument to Set Configuration to
select the configuration. This value must be set to 0x01.
0x01
0xC0
0x32
0x33
iConfiguration
bmAttributes
Index to the configuration string. This entry must equal half
of the address value where the string starts, or 0x00 if the
string does not exist.
Device attributes for this configuration.
Bit (7) Reserved. Must be set to 1.
Bit (6) Self-powered. Must be set to 1.
Bit (5) Remote wake-up. Must be set to 0.
Bits (4–0) Reserved. Must be set to 0.
0x34
bMaxPower
Maximum power consumption for this configuration. Units
used are mA*2 (i.e., 0x31 = 98 mA, 0xF9 = 498 mA). 0x00
reported for self-powered devices.
0x01
Note: A value of 0x00 or 0x01 results in the 56-pin package
configuring itself for self-powered mode, whereas a value
greater than 0x01 results in the 56-pin package reporting
itself as bus-powered. This is regardless of what address
0x33 is set to reflect in the 56-pin package.
Interface and Endpoint Descriptors
Interface Descriptor
0x35
0x36
0x37
0x38
0x39
0x3A
0x3B
0x3C
0x3D
bLength
Length of interface descriptor in bytes.
Descriptor type.
0x09
0x04
0x00
0x00
0x02
0x08
bDescriptorType
bInterfaceNumber
bAlternateSetting
bNumEndpoints
bInterfaceClass
bInterfaceSubClass
bInterfaceProtocol
iInterface
Interface number.
Alternate setting.
Number of endpoints.
Interface class.
Interface subclass.
Interface protocol.
0x06
0x00
0x50
Index to first interface string. This entry must equal half of
the address value where the string starts or 0x00 if the string
does not exist.
USB Bulk Out Endpoint
0x3E
0x3F
0x40
0x41
0x42
0x43
0x44
bLength
Length of this descriptor in bytes.
Endpoint descriptor type.
0x07
0x05
0x02
0x02
bDescriptorType
bEndpointAddress
bmAttributes
This is an Out endpoint, endpoint number 2.
This is a bulk endpoint.
wMaxPacketSize (LSB)
wMaxPacketSize (MSB)
bInterval
Max data transfer size. To be set by speed (Full speed
0x0040; High speed 0x0200)
0x00
0x02
High-speed interval for polling (maximum NAK rate). Set to
zero for full speed.
0x00
Document 38-08033 Rev. *D
Page 23 of 36
CYPRESS [ CYPRESS ]
