Philips Semiconductors

Product specification

PDIUSBH11

Universal Serial Bus Hub

1997 Aug 01

14

Get Port Status

Command

: E0h–E3h

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.

X

7

0

6

0

5

0

4

0

3

0

2

0

1

0

0

PORT STATUS BYTE

POWER ON VALUE

CONNECT

ENABLED

SUSPEND

OVER-CURRENT

RESET

POWER

LOW SPEED

RESERVED

SV00503

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.

RESET

A ‘1’ INDICATES THAT BUS RESET ON THIS PORT IS IN PROGRESS.

POWER

A ‘1’ INDICATES THAT POWER IS SUPPLIED TO DOWNSTREAM PORTS.

LOW SPEED

A ‘1’ INDICATES THAT LOW SPEED DEVICE IS CONNECTED TO THIS PORT.

IN MODE 0 OF OPERATION, THIS BIT IS THE SAME FOR ALL PORTS.

IN MODE 1, INDIVIDUAL PORT OVERCURRENT INDICATION IS POSSIBLE.

WHEN RESET IS COMPLETED (NORMAL DURATION OF 10MS), THIS BIT INDICATES A ‘0’.

SINCE THE PDIUSBH11 SUPPORTS GANG MODE POWER SWITCHING,

THIS BIT IS THE SAME FOR ALL PORTS.

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.

X

7

X

6

X

5

0

4

0

3

0

2

0

1

0

0

POWER ON VALUE

CONNECT

ENABLED

SUSPEND

OVERCURRENT

RESET

RESERVED

SV00510