Specifications

CY7C65620
CY7C65630
Document Number: 38-08037 Rev. AB Page 11 of 32
Default Descriptors
This section presents the different descriptors that are available. The following tables list the functionality of each descriptor.
Device Descriptor
The standard device descriptor for CY7C65620/CY7C65630 is based on the information found in the SPI EEPROM. The information
in the EEPROM overrides the default descriptor values. If no EEPROM is used, the CY7C65620/CY7C65630 enumerates with the
default descriptor values as shown in the following table. If a blank EEPROM is connected, the hub enumerates as vendor defined
class instead of a hub class. This is for the purpose of programming the EEPROM with the Cypress driver.
Configuration Descriptor
Byte Full Speed High Speed Field Name Description
0 0x12 0x12 bLength 18 bytes
1 0x01 0x01 bDescriptorType DEVICE_DESCRIPTOR
2,3 0x0110 0x0200 bcdUSB USB specification 2.0 (1.1 if forced FS)
4 0x09 0x09 bDeviceClass HUB
5 0x00 0x00 bDeviceSubClass None
6 0x00 0x01 bDeviceProtocol None
7 0x40 0x40 bMaxPacketSize0 64 bytes
8,9 0x04B4 0x04B4 wIdVendor VID (overridden by what is defined in EEPROM)
10,11 0x6560 0x6560 wIdProduct PID (overridden by what is defined in EEPROM)
12, 13 0x0915 0x0915 wbcdDevice DID (overridden by what is defined in EEPROM)
14 0x00 0x00 iManufacturer Overridden by EEPROM
15 0x00 0x00 iProduct Overridden by EEPROM
16 0x00 0x00 iSerialNumber Overridden by EEPROM
17 0x01 0x01 bNumConfigurations One configuration supported
Byte Full Speed High Speed Field Name Description
0 0x09 0x09 bLength 9 bytes
1 0x02
[4]
/0x07
[5]
0x02
[4]
/0x07
[5]
bDescriptorType CONFIG_DESCRIPTOR
2 0x0019 0x0019 wTotalLength Length of all other descriptors
4 0x01 0x01 bNumInterfaces 1
5 0x01 0x01 bConfigurationValue The configuration to use
6 0x00 0x00 iConfiguration Index of string descriptor describing this configuration
7
0xA0
0xE0
0xA0
0xE0
bmAttributes
Value depends on pin 45 - SELFPWR signal
SELFPWR = 0 yields 0xA0 and =1 yields 0xE0
8 0x28 0x57
[4]
bMaxPower Maximum power consumption of hub from the USB bus
Notes
4. Configured speed descriptor.
5. Other speed descriptor.