TUSB8041 datasheet(21/49 Pages) TI2

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TUSB8041

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SLLSEE4E – JUNE 2014 – REVISED JUNE 2016

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8.5.9 Device Removable Configuration Register

Table 18. Register Offset 7h

Bit No.

Reset State

Table 19. Bit Descriptions – Device Removable Configuration Register

Bit

Field Name

Access

Description

customRmbl

Custom Removable. This bit controls the ability to write to the port

removable bits.

0 = rmbl[3:0] are read only and the values are loaded from the OTP

ROM

1 = rmbl[3:0] are read/write and can be loaded by EEPROM or

written by SMBus

This bit may be written simultaneously with rmbl[3:0].

6:4

RSVD

Reserved. Read only, returns 0 when read.

3:0

rmbl[3:0]

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

downstream ports 4 through 1 are removable or permanently attached.

0 = The device attached to the port is not removable

1 = The device attached to the port is removable

Each bit corresponds directly to a downstream port n + 1, i.e. rmbl0

corresponds to downstream port 1, rmbl1 corresponds to downstream

port 2, etc.

This field is read only unless the customRmbl bit is set to 1. Otherwise

the value of this filed reflects the inverted values of the OTP ROM

non_rmb[3:0] field.

8.5.10 Port Used Configuration Register

Table 20. Register Offset 8h

Bit No.

Reset State

Table 21. Bit Descriptions – Port Used Configuration Register

Bit

Field Name

Access

Description

7:4

RSVD

Reserved. Read only.

3:0

used[3:0]

Used. The bits in this field indicate whether a port is enabled.

0 = The port is disabled

1 = The port is enabled

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

corresponds to downstream port 1, used1 corresponds to downstream

port 2, etc. All combinations are supported with the exception of both

ports 1 and 3 marked as disabled.

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