Datasheet

TUSB8040A

SLLSEA7F –MAY 2012–REVISED SEPTEMBER 2013

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3.4.9 Port Used Configuration Register

Table 3-18. Register Offset 8h

Bit No. 7 6 5 4 3 2 1 0

Reset State 0 0 0 0 X X X X

Table 3-19. Bit Descriptions – Port Used Configuration Register

Bit Field Name Access Description

7:4 RSVD RO Reserved. Read only, returns 0 when read.

Used. The bits in this field indicate whether downstream ports 3 through

0 are enabled or disabled for use. A value of 0 indicates the port is not

used. A value of 1 indicates the port is used.

The default value for these bits are loaded at the de-assertion of reset

3:0 used[3:0] RW

with the value of LEDG[3:0]z_USED[3:0] as follows:

used[3:0] defaults to wxyzb,

where w is LEDG3z_USED3, x is LEDG2z_USED2, y is

LEDG1z_USED1 and z is LEDG0z_USED0.

3.4.10 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

TUSB8040A only supports one language ID. The default value of this

7:0 langIdLsb RW

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.

3.4.11 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 MSB 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

TUSB8040A only supports one language ID. The default value of this

7:0 langIdMsb RW

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.

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