PDIUSBH12D datasheet(17/28 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

General Commands

Send Resume

Command

: F6h

Data

: None

Sends an upstream resume signal for 10 ms. This command is

normally issued when the device is in suspend. The RESUME

command is not followed by a data read or write.

The PDIUSBH12 automatically sends a RESUME command when

an event occurs downstream.

Read Current Frame Number

Command

: F5h

Data

: Read One or Two Bytes

This command is followed by one or two data reads and returns the

frame number of the last successfully received SOF. The frame

number is returned Least Significant Byte first.

LEAST SIGNIFICANT BYTE

MOST SIGNIFICANT BYTE

SV00835

Embedded Function

The USB host sees no difference between the embedded function

and a function connected to one of the downstream ports. Some of

the port commands sent by the host must be handled appropriately

by the embedded function to appear as any other downstream port.

The microcontroller maintains a series of status and status change

bits for the embedded function as described in the Get Port Status

command section. From these bits, the Status Change bit for the

embedded function is derived (i.e. the port specific Status Change

bits). This Status Change bit is then provided to the PDIUSBH12 by

the Set Status Change Bits command.

Host Requests

SetFeature PORT_RESET

Reinitialize the embedded function and set the Reset Change bit to

indicate that the reset has completed. Reset the Enable Status bit,

enable the embedded function and set its address to ‘0’ by the Set

embedded function Address / Enable command. Disable the

embedded function interrupt endpoint by the Set Endpoint Enable

command.

SetFeature PORT_ENABLE

Enable the function by the Set embedded function Address/Enable

command. Set the Enable Status bit.

SetFeature PORT_SUSPEND

Disable the function by the Set embedded function Address/Enable

command. Reset the Enable Status bit and set the Suspend Status

bit.

ClearFeature PORT_ENABLE

Disable the function by the Set embedded function Address / Enable

command. Reset the Enable Status bit.

ClearFeature PORT_SUSPEND

Enable the function by the Set embedded function Address / Enable

command. Set the Enable Status bit, reset the Suspend Status bit;

set the Resume Status Change bit to indicate that the resume has

completed.

ClearFeature any Change Indicator

Clear the corresponding status change bit.

Babbling condition

When the embedded function causes a babbling condition, the

function is automatically disabled by the PDIUSBH12. As soon as

the microcontroller detects the babbling error, it must set the Enable

Status Change bit and reset the Enable Status bit.

Remote WakeUp

There are three scenarios when a remote wakeup can occur. The

following describes the course of actions for each of the cases:

1. The device is not suspended and the embedded port is

suspended:

Enable back the function by setting the enable bit in the Set

Address/Enable register and update the following status bits in

the microcontroller program: reset the Suspend Status bit, set

the Enable Status bit and set the Suspend Status Change bit.

2. The device is suspended and the embedded port is suspended:

Send an upstream Resume using the Send Resume command,

enable back the function by setting the enable bit in the Set

Address/Enable register and update the following status bits in

the microcontroller program: reset the Suspend Status bit, set

the Enable Status bit and set the Suspend Status Change bit.

3. The device is suspended and the embedded port is enabled:

Send an upstream resume using the Send Resume command.

PDIUSBH12D Datasheet(PDF) 17 Page - NXP Semiconductors

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