PDIUSBH12D Просмотр технического описания (PDF) - Philips Electronics

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PDIUSBH12D

USB 2-port hub

Philips Electronics 

Philips Semiconductors

USB 2-port hub

Product specification

PDIUSBH12

Configuration Byte

76 54 32 1 0

10 00 11 01

Remote Wakeup

No LazyClock

Clock Running

Debug Mode

SoftConnect™

POWER ON VALUE

REMOTE WAKEUP

NO LAZYCLOCK

CLOCK RUNNING

DEBUG MODE

SoftConnect™

CONNECT DOWNSTREAM RESISTORS

NON-BLINKING LEDs

EMBEDDED FUNCTION MODE

SV00842

A ‘1’ indicates that a remote

wakeup feature is ON. Bus reset

will set this bit to ‘1’.

A ‘1’ indicates that CLKOUT will

not switch to LazyClock. A ‘0’

indicates that the CLKOUT

switches to LazyClock 1ms after

the Suspend pin goes high.

LazyClock frequency is 30KHz (±

40%). The programmed value will

not be changed by a bus reset.

A ‘1’ indicates that the internal

clocks and PLL are always

running even during Suspend

state. A ‘0’ indicates that the

internal clock, crystal oscillator

and PLL are stopped whenever

not needed. To meet the strict

Suspend current requirement, this

bit needs to be set to ‘0’. The

programmed value will not be

changed by a bus reset.

A ‘1’ indicates that all errors and

“NAKing” are reported and a ‘0’

indicates that only OK and

babbling are reported. The

programmed value will not be

changed by a bus reset.

A ‘1’ indicates that the upstream

pull-up resistor will be connected if

VBUS is available. A ‘0’ means

that the upstream resistor will not

be connected. The programmed

value will not be changed by a bus

reset.

Connect Downstream Resistors

A ‘1’ indicates that downstream

resistors are connected. A ‘0’

means that downstream resistors

are not connected. The

programmed value will not be

changed by a bus reset.

Non-blinking LEDs

A ‘1’ indicates that GoodLink™

LEDs will NOT blink when there is

traffic. Leave this bit at ‘0’ to

achieve blinking LEDs. The

programmed value will not be

changed by a bus reset.

Embedded Function Mode

A ‘1’ indicates single embedded

function mode. A ‘0’ indicates

multiple (3) embedded function

mode. See endpoint descriptions

for details. The programmed value

will not be changed by a bus

reset.

Clock Division Factor Byte

76 54 32 1 0

XX 0 0 0 0 1 1

XX 1 1 1 0 1 1

POWER ON VALUE FOR 48MHz INPUT

POWER ON VALUE FOR 12MHz INPUT

Clock Division Factor

CLOCK DIVISION FACTOR

RESERVED

SV00843

The value indicates clock division

factor for CLKOUT. The output

frequency is 48 MHz/(N+1) where

N is the Clock Division Factor. The

reset value is 3. This will give a

default output frequency at

CLKOUT pin of 12 MHz, thus

maintaining backward

compatibility to the PDIUSBH11.

When the 12 MHz input crystal

frequency is selected, the reset

value is 11. This will produce the

lowest output frequency of 4 MHz

which can then be programmed

up by the user. The PDIUSBH12

design ensures no glitching during

frequency change. The

programmed value will not be

changed by a bus reset.

1999 Jul 22

12

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