TUSB8040A datasheet(26/39 Pages) TI1

26 / 39 page

TUSB8020A, TUSB8040A

SLLSEA7B – MAY 2012 – REVISED AUGUST 2012

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3.4.8

Device Removable Configuration Register

Table 3-16. Register Offset 7h

Bit No.

Reset State

Table 3-17. Bit Descriptions – Device Removable Configuration Register

Bit

Field Name

Access

Description

7:4

RSVD

Reserved. Read only, returns 0 when read.

Removable. The bits in this field indicate whether a device attached to

downstream ports 3 through 0 are removable or permanently attached. A

value of 0 indicates the device attached to the port is not removable. A

value of 1 indicates the device attached to the port is removable.

For the RKM package option, the default value for these bits are loaded

at the de-assertion of reset with the value of LEDA[3:0]z_RMBL[3:0] as

follows:

TUSB8040A: rmbl[3:0] defaults to wxyzb,

3:0

rmbl[3:0]

TUSB8020A: rmbl[3:0] defaults to 11yzb,

where w is LEDA3z_RMBL3, x is LEDA2z_RMBL2, y is LEDA1z_RMBL1

and z is LEDA0z_RMBL0.

For the PFP package option, the default value for these bits is 1.

When in I2C/SMBus mode the bits in this field corresponding to the

enabled ports per used[3:0] may be over-written by EEPROM contents or

by an SMBus host.

3.4.9

Port Used Configuration Register

Table 3-18. Register Offset 8h

Bit No.

Reset State

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

Bit

Field Name

Access

Description

7:4

RSVD

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.

For the RKM package option, the default value for these bits are loaded

at the de-assertion of reset with the value of LEDG[3:0]z_USED[3:0] as

follows:

TUSB8040A: used[3:0] defaults to wxyzb,

3:0

used[3:0]

TUSB8020A: used[3:0] defaults to 00yzb,

where w is LEDG3z_USED3, x is LEDG2z_USED2, y is

LEDG1z_USED1 and z is LEDG0z_USED0.

For the PFP package option, the default value for these bits is 1.

When in I2C/SMBus mode the bits in this field corresponding to ports

enabled by a configuration may be over-written by EEPROM contents or

by an SMBus host.

FUNCTIONAL DESCRIPTION

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