Datasheet

Not Recommended for New Designs

TUSB8040

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SLLSE42I –SEPTEMBER 2010–REVISED SEPTEMBER 2013

3.3.13 Manufacturer String Length Register

Table 3-26. Register Offset 23h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 0 0 0 0 0

Table 3-27. Bit Descriptions – Manufacturer String Length Register

BIT FIELD NAME ACCESS DESCRIPTION

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

Manufacturer string length. The string length in bytes for the manufacturer string. The

default value is 0, indicating that a manufacturer string is not provided. The maximum string

length is 64 bytes. If the string length in the Serial Number String Length Register is set to

6:0 mfgStringLen RW

zero, the Manufacturing String must also be set to a length of zero.

When the field is non-zero, a manufacturer string of mfgStringLen bytes is returned at string

index 3 from the data contained in the Manufacturer String registers.

3.3.14 Product String Length Register

Table 3-28. Register Offset 24h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 0 0 0 0 0

Table 3-29. Bit Descriptions – Product String Length Register

BIT FIELD NAME ACCESS DESCRIPTION

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

Product string length. The string length in bytes for the product string. The default value is

0, indicating that a product string is not provided. The maximum string length is 64 bytes.

If the string length in the Serial Number String Length Register is set to zero, the Product

6:0 mfgStringLen RW

String must also be set to a length of zero.

When the field is non-zero, a product string of prodStringLen bytes is returned at string

index 2 from the data contained in the Product String registers.

3.3.15 Serial Number Registers

Table 3-30. Register Offset 30h-4Fh

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE x x x xx x x x x

Table 3-31. Bit Descriptions – Serial Number Byte N Register

BIT FIELD NAME ACCESS DESCRIPTION

Serial Number byte N. The serial number returned in the Serial Number string descriptor at

string index 1. When customSernum is 1, these registers may be over-written by EEPROM

7:0 serialNumber[n] RW

contents or by an SMBus host. The same serial number will be returned in both the USB

2.0 and USB 3.0 descriptors of the TUSB8040.

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