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CY7C65640A-LTXCT Datasheet(PDF) 11 Page - Cypress Semiconductor |
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CY7C65640A-LTXCT Datasheet(HTML) 11 Page - Cypress Semiconductor |
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11 / 25 page  CY7C65640A Document Number: 38-08019 Rev. *N Page 11 of 25 Table 11. Hub Descriptor Note 4. This value is configured through the External EEPROM. Byte All Speeds Field Name Description 0 0x09 bLength 9 Bytes 1 0x29 bDescriptorType HUB descriptor 2 0x04[4] bNbrPorts Number of ports supported 3,4 0x0089[4] wHubCharacteristics b1, b0: Logical Power Switching Mode 00: Ganged power switching (all ports’ power at once) 01: Individual port power switching (Default in TetraHub) b2: Identifies a Compound Device, 0: Hub is not part of a compound device (Default in TetraHub), 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 an overcurrent status (Default in TetraHub). 1X: No overcurrent protection. This option is enabled only for bus- powered hubs that do not implement overcurrent protection. b6, b5: TT Think Time 00: TT requires at most 8 FS bit times of inter transaction gap on a full/low speed downstream bus (Default in TetraHub). 01: TT requires at most 16 FS bit times. 10: TT requires at most 24 FS bit times. 11: TT requires at most 32 FS bit times. b7: Port indicators supported, 0: Port indicators are not supported on its downstream facing ports and the PORT_INDICATOR request has no effect. 1: Port indicators are supported on its downstream facing ports and the PORT_INDICATOR request controls the indicators. b15...b8: Reserved 5 0x32[4] bPwrOn2PwrGood Time from when the port is powered to when the power is good on that port 6 0x64[4] bHubContrCurrent Maximum current requirement for the hub controller 7 0x00[4] bDeviceRemovable Indicates if the port has a removable device attached 8 0xFF[4] bPortPwrCtrlMask Required for compatibility with software written for 1.0 compliant devices [+] Feedback |
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