Philips Semiconductors

Product specification

PDIUSBH11

Universal Serial Bus Hub

1997 Aug 01

13

Hub Commands

Hub commands are used to report connectivity and power status between the hub and the host. These commands allow the host to enable

each port individually and get any change of status such as new connectivity information.

Clear/Set Port Feature

Command

: E0–E3h (Clear) and E8h–EBh (Set)

Data

: Write 1 byte

When the controller receives a Set Feature or a Clear Feature request, there are two possibilities:

the PDIUSBH11.

When the PDIUSBH11 is configured in mode 0, there is only one power switch output and one overcurrent input. This means that the

F_PORT_POWER and C_PORT_OVERCURRENT features are not port specific. For these features, any of the Set / Clear Feature commands

can be used. The specific port assignment is ignored.

When the PDIUSBH11 is configured in mode 1, there is still only one power switch output but there are four individual overcurrent input pins

corresponding to each port. This means that the F_PORT_POWER feature is port specific and the C_PORT_OVERCURRENT feature is not

port specific.

Setting the F_PORT_POWER feature turns the power on when it is off and turns the overcurrent detection on only when the power is already

on. This allows to have a short period of overcurrent condition at the moment that power is switched on. For this reason, the F_PORT_POWER

feature needs to be set twice. Clearing this feature turns both the power and the overcurrent detection off.

The data written in the data phase is the feature code described in Table 2.

Table 2.

FEATURE

FEATURE CODE

SET

CLEAR

F_PORT_ENABLE

0

Enables a port

Disables a port

F_PORT_SUSPEND

1

Suspends a port

Resumes a port

FC_PORT_RESET

2

Resets a port

Clears a port Reset Change bit

F_PORT_POWER

3

Powers all ports

Unpowers all ports

C_PORT_CONNECTION

4

–

Clears a port Connection Change bit

C_PORT_ENABLE

5

–

Clears a port Enable Change bit

C_PORT_SUSPEND

6

–

Clears a port Suspend Change bit

C_PORT_OVERCURRENT

7

–

Clears a port (Mode 1) or hub (Mode 0) Overcurrent Change bit