TUSB8042AI datasheet(26/64 Pages) TI2

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8.2 ROM Signature Register

Figure 8-1. Register Offset 0h

Bit No.

Reset State

Table 8-2. Bit Descriptions – ROM Signature Register

Bit

Field

Type

Description

7:0

romSignature

ROM Signature Register. This register is used by the TUSB8042A 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 TUSB8042A aborts the EEPROM load and executes with

the register defaults.

8.3 Vendor ID LSB Register

Figure 8-2. Register Offset 1h

Bit No.

Reset State

Table 8-3. 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 can be overwritten 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.

8.4 Vendor ID MSB Register

Figure 8-3. Register Offset 2h

Bit No.

Reset State

Table 8-4. 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 can be overwritten 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.

TUSB8042A

SLLSF93A – JUNE 2019 – REVISED JANUARY 2025

www.ti.com

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