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CY7C65640A-LFXC Datasheet(PDF) 11 Page - Cypress Semiconductor |
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CY7C65640A-LFXC Datasheet(HTML) 11 Page - Cypress Semiconductor |
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11 / 23 page  CY7C65640A Document #: 38-08019 Rev. *J Page 11 of 23 Configuration Options Systems using TetraHub must have an external EEPROM in order for the device to have a unique VID, PID, and DID. The TetraHub can talk to SPI EEPROM that are double byte addres- sable only. TetraHub uses the command format from the '040 parts. The TetraHub cannot talk to ‘080 EEPROM parts, as the read command format used for talking to ‘080 is not the same as ‘040. The '010s and '020s uses the same command format as used to interface with the ‘040 and hence these can also be used to interface with the TetraHub. Default – 0xD0 Load When used in default mode, only a unique VID, PID, and DID must be present in the external SPI EEPROM. The contents of the EEPROM must contain this information in the following format: Configured – 0xD2 Load Byte 0: 0xD2 Needs to be programmed with 0xD2 Byte 1: VID (LSB) Least Significant Byte of Vendor ID Byte 2: VID (MSB) Most Significant Byte of Vendor ID Byte 3: PID (LSB) Least Significant Byte of Product ID Byte 4: PID (MSB)] Most Significant Byte of Product ID Byte 5: DID (LSB) Least Significant Byte of Device ID Byte 6: DID (MSB)] Most Significant Byte of Device ID Byte 7: EnableOvercurrentTimer[3:0], DisabledOvercurrent- Timer[3:0] 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 . Default: 8 ms = 0x88. Byte 8: ActivePorts[3:0], RemovablePorts[3:0] Bits 7–4 are the ActivePorts[3:0] bits that indicates if the cor- responding port is usable. For example, a two-port hub that uses ports 1 and 4 would set this field to 0x09. The total num- ber 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 remov- able (set to HIGH). This bit’s values are recorded appropriate- ly in the HubDescriptor:DeviceRemovable field. Default: 0xFF. Byte 9: MaximumPower This value is reported in the ConfigurationDescriptor:bMax- Power field and is the current in 2-mA intervals that is required from the upstream hub. Default: 0x32 = 100 mA Byte 10: HubControllerPower This value is reported in the HubDescriptor:bHubContrCur- rent field and is the current in milliamperes required by the hub controller. Default: 0x64 = 100 mA. Byte 11: PowerOnTimer This value is reported in the HubDescrip- tor:bPwrOn2PwrGood field and is the time in 2-ms intervals from the SetPortPower command until the power on the cor- responding downstream port is good. Default: 0x32 = 100 ms. Byte 12: IllegalHubDescriptor, Unused, FullspeedOnly, NoPortIndicators, Reserved, GangPowered, SingleTTOnly, NoEOPatEOF1 Bit 7: IllegalHubDescriptor: For GetHubDescriptor request, some USB hosts use a DescriptorTypeof 0x00 instead of HUB_DESCRIPTOR, 0x29. According to the USB 2.0 stan- dard, 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 Byte Value 0 0xD0 1 VID (LSB) 2 VID (MSB) 3 PID (LSB) 4 PID (MSB) 5 DID (LSB) 6 DID (MSB) Byte Value (MSB->LSB) 0 0xD2 1 VID (LSB) 2 VID (MSB) 3 PID (LSB) 4 PID (MSB) 5DID (LSB) 6 DID (MSB) 7 EnableOverCurrentTimer[3:0], DisableOvercurrent- Timer[3:0] 8 ActivePorts[3:0], RemovablePorts[3:0] 9MaxPower 10 HubControllerPower 11 PowerOnTimer 12 IllegalHubDescriptor, Unused, FullspeedOnly, NoPortIndicators, Reserved, GangPowered, SingleT- TOnly, NoEOPatEOF1 [+] Feedback |
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