PDIUSBH12 datasheet(16/28 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

Get Port Status

Command

: E0h–E1h

Data

: Read 1 or 2 bytes

The Get Port Status Command can be followed by one or two data

reads. The first byte returned contains the port status. The second

byte returned is the port status change byte.

Port Status Byte

SV00846

POWER ON VALUE

CONNECT

ENABLED

SUSPEND

OVERCURRENT

RESET

POWER

LOW SPEED

RESERVED

Connect

A ‘1’ indicates that a device is connected on

this port of the hub.

Enabled

A ‘1’ indicates that this port is enabled.

Suspend

A ‘1’ indicates that this port is suspended.

OverCurrent

A ‘1’ indicates that overcurrent condition

exists on this port. In mode 0 of operation,

this bit is the same for all ports. In mode 1,

individual port overcurrent indication is

possible.

Reset

A ‘1’ indicates that bus reset on this port is in

progress. When reset is completed (nominal

duration of 10 ms), this bit indicates a ‘0’.

Power

A ‘1’ indicates that power is supplied to

downstream ports. Since the PDIUSBH12

supports gang mode power switching, this

bit is the same for all ports.

Low Speed

A ‘1’ indicates that low speed device is

connected to this port. This bit is only valid

when Connect bit is a ‘1’.

Port Status Change Byte

The description for the Port Status Change Byte is similar to the Port

Status Byte except that the value of the bits are ‘1’ only when a

change has occurred.

SV00847

POWER ON VALUE

CONNECT

ENABLED

SUSPEND

OVERCURRENT

RESET

RESERVED

Set Status Change Bits

Command

: F7h

Data

: Write 1 byte

For assembling the hub’s status change register, the device needs

some additional information from the controller, i.e. the Local Power

Status Change bit and the embedded function Status Change bit.

These are provided by the Set Status Change Bits command. This

command is always followed by one data write which contains the

Local Power Status Change bit at the LSB and the embedded

function Status Change bit at position 1. All other bits should be 0.

SV00848

POWER ON VALUE

LOCAL POWER

EMBEDDED FUNCTION 1

RESERVED

EMBEDDED FUNCTION 6

EMBEDDED FUNCTION 7

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