PDIUSBH12 datasheet(13/28 Pages) PHILIPS

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Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

Data Flow Commands

Data flow commands are used to manage the data transmission

between the USB endpoints and the monitor. Much of the data flow

is initiated via an interrupt to the microcontroller. The microcontroller

utilizes these commands to access and determine whether the

endpoint FIFOs have valid data.

Read Interrupt Register

Command

: F4h

Data

: Read 2 bytes

Interrupt Register Byte 1

SV00844

POWER ON VALUE

ENDPOINT INDEX 4

ENDPOINT INDEX 5

ENDPOINT INDEX 6

ENDPOINT INDEX 7

ENDPOINT INDEX 1 (HUB CONTROL IN)

ENDPOINT INDEX 2

ENDPOINT INDEX 3

ENDPOINT INDEX 0 (HUB CONTROL OUT)

Interrupt Register Byte 2

SV00845

POWER ON VALUE

ENDPOINT INDEX 12

ENDPOINT INDEX 13

BUS RESET

RESERVED

ENDPOINT INDEX 9

ENDPOINT INDEX 10

ENDPOINT INDEX 11

ENDPOINT INDEX 8

This command indicates the origin of an interrupt. A ‘1’ indicates an

interrupt occurred at this endpoint. The bits are cleared by reading

the endpoint status register through Read Endpoint Status

command.

After a bus reset an interrupt will be generated and bit 6 of the

Interrupt Register Byte 2 will be ‘1’. [In the PDIUSBH11, the bus

reset event is indicated by the absence of a ‘1’ in any bit of the

Interrupt Register. Note that the backward compatibility is still

maintained because in the PDIUSBH11, the Interrupt Register Byte

2 does not exist.]

The bus reset interrupt is internally cleared by reading the interrupt

through the RESET_N pin with the sole difference of interrupt

notification.

The hub interrupt endpoint is handled internally by the PDIUSBH12

hardware without the need of microcontroller intervention.

Select Endpoint

Command

: 00-0Dh

Data

: Optional Read 1 byte

The Select Endpoint command initializes an internal pointer to the

start of the Selected buffer. Optionally, this command can be

followed by a data read, which returns ‘0’ if the buffer is empty and

‘1’ if the buffer is full.

POWER ON VALUE

FULL/EMPTY

RESERVED

SV00831

Full/Empty

A ‘1’ indicates the buffer is full, ‘0’

indicates an empty buffer.

Read Last Transaction Status

Command

: 40–4Dh

Data

: Read 1 byte

The Read Last Transaction Status command is followed by one data

read that returns the status of the last transaction of the endpoint.

This command also resets the corresponding interrupt flag in the

interrupt register, and clears the status, indicating that it was read.

This command is useful for debugging purposes. Since it keeps

track of every transaction, the status information is overwritten for

each new transaction.

POWER ON VALUE

DATA RECEIVE/TRANSMIT SUCCESS

ERROR CODE (SEE TABLE)

SETUP PACKET

DATA 0/1 PACKET

PREVIOUS STATUS NOT READ

SV00832

Data Receive/Transmit Success

A ‘1’ indicates data has been

received or transmitted

successfully.

Error Code

See Table 3, Error Codes.

Setup Packet

A ‘1’ indicates the last

successful received packet

had a SETUP token (this will

always read ‘0’ for IN buffers.

Data 0/1 Packet

A ‘1’ indicates the last

successful received or sent

packet had a DATA1 PID.

Previous Status not Read

A ‘1’ indicates a second event

occurred before the previous

status was read.

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