Datasheet

Not Recommended for New Designs

TUSB8040

SLLSE42I –SEPTEMBER 2010–REVISED SEPTEMBER 2013

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3.3.10 Language ID LSB Register

Table 3-20. Register Offset 20h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 0 1 0 0 1

Table 3-21. Bit Descriptions – Language ID LSB Register

BIT FIELD NAME ACCESS DESCRIPTION

Language ID least significant byte. This register contains the value returned in the LSB of

the LANGID code in string index 0. The TUSB8040 only supports one language ID. The

7:0 langIdLsb RW default value of this register is 09h representing the LSB of the LangID 0409h indicating

English United States. When customStrings is 1, this field may be over-written by the

contents of an attached EEPROM or by an SMBus host.

3.3.11 Language ID MSB Register

Table 3-22. Register Offset 21h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 0 0 1 0 0

Table 3-23. Bit Descriptions – Language ID LSB Register

BIT FIELD NAME ACCESS DESCRIPTION

Language ID most significant byte. This register contains the value returned in the MSB of

the LANGID code in string index 0. The TUSB8040 only supports one language ID. The

7:0 langIdMsb RW default value of this register is 04h representing the MSB of the LangID 0409h indicating

English United States. When customStrings is 1, this field may be over-written by the

contents of an attached EEPROM or by an SMBus host.

3.3.12 Serial Number String Length Register

Table 3-24. Register Offset 22h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 1 1 0 0 0

Table 3-25. Bit Descriptions – Serial Number String Length Register

BIT FIELD NAME ACCESS DESCRIPTION

7:6 RSVD RO Reserved. Read only, returns 0 when read.

Serial number string length. The string length in bytes for the serial number string. The

default value is 0, indicating that a serial number string is not supported. The maximum

string length is 32 bytes.

This field may be over-written by the contents of an attached EEPROM or by an SMBus

5:0 serNumStringLen RW host.

When the field is non-zero, a serial number string of serNumbStringLen bytes is returned at

string index 1 from the data contained in the Serial Number String registers. If the string

length in the Serial Number String Length Register is set to zero, the Manufacturing String

Length and Product String Length must also be set to a length of zero.

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