USB2642 datasheet(31/56 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001578C-page 31

USB2642

7.4.3.17

E7h: Non-Removable Device

7.4.3.18

E8h: Port Disable For Self-Powered Operation

Bit

Name

Description

7:0

NR_DEVICE

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

: port is removable

: port is non-removable

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

undetachable from the hub. 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 = rsvd

Bit 6 = rsvd

Bit 5 = rsvd

Bit 4 = rsvd

Bit 3 = controls physical port 3

Bit 2 = controls physical port 2

Bit 1 = controls physical port 1

Bit 0 = rsvd

Note:

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

the card reader as a non-removable device.

Bit

Name

Description

7:0

PORT_DIS_SP

Disables 1 or more ports.

: port is available

: port is disabled

During self-powered operation

this register selects the ports which will be

permanently disabled. The ports are unavailable to be enabled or

enumerated by a host controller. The ports can be disabled in any order

since the internal logic will automatically report the correct number of

enabled ports to the USB host and will reorder the active ports in order to

ensure proper function.

Bit 7 = rsvd

Bit 6 = rsvd

Bit 5 = rsvd

Bit 4 = rsvd

Bit 3 = controls physical port 3

Bit 2 = controls physical port 2

Bit 1 = controls physical port 1

Bit 0 = rsvd

Note:

Bit 1 must be set to ‘0’ in order for the card reader to enumerate.

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