USB2513 datasheet(23/57 Pages) MICROCHIP

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DS00001692D-page 23

USB251xB/xBi

5.1.8

5.1.9

Bit Number

Bit Name

Description

DYNAMIC

Dynamic Power Enable: controls the ability of the hub to automatically change

from self-powered to bus-powered operation if the local power source is

removed or unavailable. It can also go from bus-powered to self-powered

operation if the local power source is restored.

When dynamic power switching is enabled, the hub detects the availability of

a local power source by monitoring LOCAL_PWR. If the hub detects a change

in power source availability, the hub immediately disconnects and removes

power from all downstream devices. It also disconnects the upstream port.

The hub will then re-attach to the upstream port as either a bus-powered hub

(if local power is unavailable) or a self-powered hub (if local power is

available).

: no dynamic auto-switching

: dynamic auto-switching capable

rsvd

5:4

OC_TIMER

Over Current Timer Delay:

: 0.1 ms

: 4.0 ms

: 8.0 ms

: 16.0 ms

COMPOUND

Compound Device: indicates the hub is part of a compound device (see the

USB Specification

for definition). The applicable port(s) must also be defined

as having a non-removable device.

Note:

When configured via strapping options, declaring a port as non-

removable automatically causes the hub controller to report that it is

part of a compound device.

: no

: yes, the hub is part of a compound device

2:0

rsvd

Bit Number

Bit Name

Description

7:4

rsvd

PRTMAP_EN

Port Mapping Enable: selects the method used by the hub to assign port

numbers and disable ports.

: standard mode

: port mapping mode

2:1

rsvd

STRING_EN

Enables String Descriptor Support

: string support disabled

: string support enabled

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