Datasheet

Not Recommended for New Designs
TUSB8040
www.ti.com SLLSE42I –SEPTEMBER 2010–REVISED SEPTEMBER 2013
3.3.4 Product ID LSB Register
Table 3-8. Register Offset 3h
BIT NO. 7 6 5 4 3 2 1 0
RESET STATE 0 0 0 0 0 1 0 0
Table 3-9. Bit Descriptions – Product ID MSB Register
BIT FIELD NAME ACCESS DESCRIPTION
Product ID LSB. Least significant byte of the product ID assigned by Texas Instruments; the
default value of this register is 40h representing the LSB of the product ID assigned by
Texas Instruments. The value of this register will be reported as configured for the
7:0 productIdLsb RW
SuperSpeed Device descriptor. The USB 2.0 Device descriptor will report the value in this
register with bit [1] toggled. This ensures that the USB drivers load properly for both hubs.
The value may be over-written to indicate a customer product ID.
3.3.5 Product ID MSB Register
Table 3-10. Register Offset 4h
BIT NO. 7 6 5 4 3 2 1 0
RESET STATE 1 0 0 0 0 0 0 0
Table 3-11. Bit Descriptions – Product ID MSB Register
BIT FIELD NAME ACCESS DESCRIPTION
Product ID MSB. Most significant byte of the product ID assigned by Texas Instruments; the
7:0 productIdMsb RW default value of this register is 80h representing the MSB of the product ID assigned by
Texas Instruments. The value may be over-written to indicate a customer product ID.
3.3.6 Device Configuration Register
Table 3-12. Register Offset 5h
BIT NO. 7 6 5 4 3 2 1 0
RESET STATE 0 0 0 X X X X X
Table 3-13. Bit Descriptions – Device Configuration Register
BIT FIELD NAME ACCESS DESCRIPTION
Custom Strings enable.
When this bit is set to 1 and the TUSB8040 is in I
2
C mode, the Manufacturer String Length,
Manufacturer String, Product String Length, Product String, and Language ID registers are
7 customStrings RW loaded from the contents of the EEPROM.
When the value of this bit is 1 and the TUSB8040 is in SMBUS mode, the Manufacturer
String Length, Manufacturer String, Product String Length, Product String, and Language
ID registers may written by an SMBus host.
Custom Serial Number Enable.
When the TUSB8040 is in I
2
C mode, the TUSB8040 loads the serial number register from
the contents of the EEPROM.
6 customSernum RW
When the TUSB8040 is in SMBUS mode, the Serial Number registers may written by an
SMBus host.
This bit is always 1.
Copyright © 2010–2013, Texas Instruments Incorporated FUNCTIONAL DESCRIPTION 15
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