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TUSB8043AI データシート(PDF) 26 Page - Texas Instruments |
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TUSB8043AI データシート(HTML) 26 Page - Texas Instruments |
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26 / 56 page  26 TUSB8043A SLLSF94 – JUNE 2019 www.ti.com Product Folder Links: TUSB8043A Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 8.5.2 ROM Signature Register Figure 3. Register Offset 0h Bit No. 7 6 5 4 3 2 1 0 Reset State 0 0 0 0 0 0 0 0 Table 7. Bit Descriptions – ROM Signature Register Bit Field Type Description 7:0 romSignature RW ROM Signature Register. This register is used by the TUSB8043A in I2C mode to validate the attached EEPROM has been programmed. The first byte of the EEPROM is compared to the mask 55h and if not a match, the TUSB8043A aborts the EEPROM load and executes with the register defaults. 8.5.3 Vendor ID LSB Register Figure 4. Register Offset 1h Bit No. 7 6 5 4 3 2 1 0 Reset State 0 1 0 1 0 0 0 1 Table 8. Bit Descriptions – Vendor ID LSB Register Bit Field Type Description 7:0 vendorIdLsb RO/RW Vendor ID LSB. Least significant byte of the unique vendor ID assigned by the USB-IF; the default value of this register is 51h representing the LSB of the TI Vendor ID 0451h. The value may be over-written to indicate a customer Vendor ID. Value used for this field is the non-zero value written by EEPROM/SMBus to both PID and VID. If a zero value is written by EEPROM/SMbus to both PID and VID, then value used for this field is the non-zero value from OTP. If a zero value is written by OTP, then value used for this field is 51h. 8.5.4 Vendor ID MSB Register Figure 5. Register Offset 2h Bit No. 7 6 5 4 3 2 1 0 Reset State 0 0 0 0 0 1 0 0 Table 9. Bit Descriptions – Vendor ID MSB Register Bit Field Type Description 7:0 vendorIdMsb RO/RW Vendor ID MSB. Most significant byte of the unique vendor ID assigned by the USB-IF; the default value of this register is 04h representing the MSB of the TI Vendor ID 0451h. The value may be over-written to indicate a customer Vendor ID. Value used for this field is the non-zero value written by EEPROM/SMBus to both PID and VID. If a zero value is written by EEPROM/SMbus to both PID and VID, then value used for this field is the non-zero value from OTP. If a zero value is written by OTP, then value used for this field is 04h. |
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