CY7C65640-LFC Cypress Semiconductor Corp, CY7C65640-LFC Datasheet - Page 17

• Manufacturer Part Number: CY7C65640-LFC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C65640-LFC

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / Rohs Status: Not Compliant

Byte 5: DID (LSB)
Byte 6: DID (MSB)]
Byte 7: EnableOvercurrentTimer[3:0], DisabledOvercurrentTimer[3:0]
Byte 8: ActivePorts[3:0], RemovablePorts[3:0]
Byte 9: MaximumPower
Byte 10: HubControllerPower
Byte 11: PowerOnTimer
Byte 12: IllegalHubDescriptor, Unused, FullspeedOnly, NoPortIndicators, Reserved, GangPowered, SingleTTOnly,
NoEOPatEOF1
Document #: 38-08019 Rev. *E
Count time in ms for filtering overcurrent detection. Bits 7–4 are for an enabled port, and bits 3–0 are for a disabled port. Both
range from 0 ms to 15 ms. See section 4.8. Default: 8 ms = 0x88.
Bits 7–4 are the ActivePorts[3:0] bits that indicates if the corresponding port is usable. For example, a two-port hub that uses
ports 1 and 4 would set this field to 0x09. The total number of ports reported in the Hub Descriptor: bNbrPorts field is calculated
from this. Bits 3–0 are the RemovablePorts[3:0] bits that indicates whether the corresponding port is removable (set to HIGH).
This bit’s values are recorded appropriately in the HubDescriptor:DeviceRemovable field. Default: 0xFF.
This value is reported in the ConfigurationDescriptor:bMaxPower field and is the current in 2-mA intervals that is required from
the upstream hub. Default: 0x32 = 100 mA
This value is reported in the HubDescriptor:bHubContrCurrent field and is the current in milliamperes required by the hub
controller. Default: 0x64 = 100 mA.
This value is reported in the HubDescriptor:bPwrOn2PwrGood field and is the time in 2-ms intervals from the SetPortPower
command until the power on the corresponding downstream port is good. Default: 0x32 = 100 ms.
Bit 7: IllegalHubDescriptor: For GetHubDescriptor request, some USB hosts use a DescriptorTypeof 0x00 instead of
HUB_DESCRIPTOR, 0x29. According to the USB 2.0 standard, a hub must treat this as a Request Error, and STALL the
transaction accordingly (USB 2.0, 11.24.2.5). For systems that do not accept this, the IllegalHubDescriptor configuration bit
may be set to allow TetraHub to accept a DescriptorType of 0x00 for this command. Default is 0, recommended setting is 1.
Bit 6: Unused: This bit is an unused, don’t care bit and can be set to anything.
Bit 5: Fullspeed: Only configures the hub to be a full-speed only device. Default set to 0.
Bit 4: NoPortIndicators: Turns off the port indicators and does not report them as present in the HubDescriptor, wHubCharac-
teristics b7 field. Default set to 0.
Bit 3: Reserved: This bit is reserved and should not be set to 1. Must be set to 0.
Bit 2: GangPowered: Indicates whether the port power switching is ganged (set to 1) or per-port (set to 0). This is reported in
the HubDescriptor, wHubCharacteristics field, b4, b3, b1, and b0. Default set to 0.
Bit 1: SingleTTOnly: Indicates that the hub should only support single Transaction Translator mode. This changes various
descriptor values. Default set to 0.
Bit 0: NoEOPatEOF1 turns off the EOP generation at EOF1 in full-speed mode. Note that several USB 1.1 hosts can not
handle EOPatEOF1 properly. Cypress recommends that this option be turned off for general-purpose hubs. Default is 0,
recommended setting is 1.
Least Significant Byte of Device ID
Most Significant Byte of Device ID
CY7C65640
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