Datasheet

Not Recommended for New Designs

TUSB8040

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SLLSE42I –SEPTEMBER 2010–REVISED SEPTEMBER 2013

3.3.8 Device Removable Configuration Register

Table 3-16. Register Offset 7h

BIT NO. 7 6 5 4 3 2 1 0

RESET STATE 0 0 0 0 0 0 0 0

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

BIT FIELD NAME ACCESS DESCRIPTION

7:4 RSVD RO 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.

Each bit corresponds directly to a downstream port, i.e. rmbl0 corresponds to downstream

3:0 rmbl[3:0] RW port 0.

For the TUSB8040PFP:

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

Four-port hub - rmbl[3:0] defaults to 1111b.

When in I

C/SMBus mode the bits in this field corresponding to the enabled ports per

rmbl[3:0] may be over-written by EEPROM contents or by an SMBus host.

3.3.9 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 0 0 0 0

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.

Each bit corresponds directly to a downstream port, i.e. used0 corresponds to downstream

port 0.

3:0 used3:0] RW

For the TUSB8040PFP:

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

Four-port hub - used[3:0] defaults to 1111b.

When in I

C/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.

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