CY4606 datasheet(13/29 Pages) CYPRESS

13 / 29 page

CY7C65620/CY7C65630

Document Number: 38-08037 Rev. *T

Page 13 of 29

Hub Descriptor

Byte

All Speed

Field Name

Description

0x09

bLength

9 bytes

0x29

bDescriptorType

HUB descriptor

0x04[6]

0x02

bNbrPorts

Number of ports supported, CY7C65630

Number of ports supported, CY7C65620

3,4

0x0089[6]

wHubCharacteristics

b1, b0: Logical power switching mode

00: Ganged power switching (all ports’ power at once).

01: Individual port power switching (Default in CY7C65620/CY7C65630).

b2: Identifies a compound device

0: Hub is not part of a compound device (Default in CY7C65620/CY7C65630).

1: Hub is part of a compound device.

b4, b3: Overcurrent protection mode

00: Global overcurrent protection. The hub reports overcurrent as a

summation of all ports’ current draw, without a breakdown of individual port

overcurrent status.

01: Individual port overcurrent protection. The hub reports overcurrent on a

per-port

basis.

Each

port

has

overcurrent

status

(Default

CY7C65620/CY7C65630).

1X: No overcurrent protection. This option is allowed only for bus powered

hubs that do not implement overcurrent protection.

b6, b5: TT think time

00: TT requires at most eight FS bit times of inter transaction gap on a full/low-

speed downstream bus (Default in CY7C65620/CY7C65630).

b7: Port indicators supported,

0: Port indicators are not supported on its downstream facing ports and the

SetPortIndicator request has no effect.

1: Port indicators are supported on its downstream facing ports and the

SetPortIndicator request controls the indicators. See Functional Overview and

Supported USB Requests. (Default in CY7C65620/CY7C65630).

b15, b8: Reserved

0x32[6]

bPwrOn2PwrGood

Time from when the port is powered to when the power is good on that port.

0x28[6]

0xAE[6]

bHubContrCurrent

Maximum current requirement for the hub controller at full speed.

Maximum current requirement for the hub controller at high speed.

0x00[6]

bDeviceRemovable

Indicates if the logical port has a removable device attached (0 = removable,

1 = non removable).

0xFF[6]

bPortPwrCtrlMask

Required for compatibility with software written for 1.0 compliant devices.

Note

6. This value is configured through the external EEPROM.

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