USB2641 datasheet(35/60 Pages) MICROCHIP

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DS00001947C-page 35

USB2640/USB2641

7.3.5.9

E6h: Configuration Data Byte 3 (CFG_DAT_BYT3)

7.3.5.10

E7h: Non-Removable Device

Bit

Name

Description

7:4

Reserved

Always reads ‘0’.

PRTMAP_EN

Port mapping enable: Selects the method used by the hub to assign port

numbers and disable ports.

‘0’ = Standard Mode. Strap options or the following registers are used to define

which ports are enabled, and the ports are mapped as Port ‘n’ on the hub is

reported as Port ‘n’ to the host, unless one of the ports is disabled, then the

higher numbered ports are remapped in order to report contiguous port

numbers to the host.

‘1’ = Port map mode. The mode enables remapping via the registers defined

below.

2:0

Reserved

Always reads ‘0’.

Bit

Byte Name

Description

7:0

NR_DEVICE

Indicates which port(s) include non-removable devices.

‘0’ = Port is removable

‘1’ = Port is non-removable

Informs the host if one of the active ports has a permanent device that is

undetachable from the hub. (Note: The device must provide its own descriptor

data.)

When using the internal default option, the NON_REM[1:0] pins will designate

the appropriate ports as being non-removable.

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Controls physical port 3

Bit 2= Controls physical port 2

Bit 1= Controls physical port 1

Bit 0= Reserved, always = ‘0’

Note:

Bit 1 must be set to a ‘1’ by the firmware for proper identification of

the card reader as a non-removable device.

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