PDIUSBH11A Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

Список матч

PDIUSBH11A

Universal Serial Bus Hub

Philips Electronics 

Philips Semiconductors

Universal Serial Bus Hub

Product specification

PDIUSBH11A

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

Data

: F4h

: Read 2 bytes

Interrupt Register Byte 1

76 54 32 1 0

00 00 0000

POWER ON VALUE

ENDPOINT INDEX 0 (HUB CONTROL OUT)

ENDPOINT INDEX 1 (HUB CONTROL IN)

ENDPOINT INDEX 2

ENDPOINT INDEX 3

ENDPOINT INDEX 4

ENDPOINT INDEX 5

ENDPOINT INDEX 6

ENDPOINT INDEX 7

SV00844

Interrupt Register Byte 2

76 54 32 1 0

X0 00 0000

POWER ON VALUE

ENDPOINT INDEX 8

ENDPOINT INDEX 9

ENDPOINT INDEX 10

ENDPOINT INDEX 11

ENDPOINT INDEX 12

ENDPOINT INDEX 13

BUS RESET

RESERVED

SV00845

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

register. A bus reset is completely identical to the hardware reset

through the RESET_N pin with the sole difference of interrupt

notification.

The hub interrupt endpoint is handled internally by the PDIUSBH11A

hardware without the need of microcontroller intervention.

Select Endpoint

Command

Data

: 00-0Dh

: 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.

76 54 32 1 0

XX XX XX X0

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

Data

: 40–4Dh

: 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.

76 54 32 1 0

00 00 00 00

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.

1999 Jul 22

13

Share Link: