TUSB8044AI datasheet(29/63 Pages) TI1

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TUSB8044A

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SLLSF92 – FEBRUARY 2019

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8.5.2 ROM Signature Register

Figure 3. Register Offset 0h

Bit No.

Reset State

Table 10. Bit Descriptions – ROM Signature Register

Bit

Field

Type

Description

7:0

romSignature

ROM Signature Register. This register is used by the TUSB8044A 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 TUSB8044A aborts the EEPROM load and executes with

the register defaults.

8.5.3 Vendor ID LSB Register

Figure 4. Register Offset 1h

Bit No.

Reset State

Table 11. 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 will be 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

will be the non-zero value from OTP. If a zero value is written by OTP,

then value used for this field will be 51h.

8.5.4 Vendor ID MSB Register

Figure 5. Register Offset 2h

Bit No.

Reset State

Table 12. 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 will be 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

will be the non-zero value from OTP. If a zero value is written by OTP,

then value used for this field will be 04h.

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