ST5481 Просмотр технического описания (PDF) - STMicroelectronics

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ST5481

L.O.U.I.S - LOW COST USB ISDN SOLUTION

STMicroelectronics 

ST5481

8 - DEVICE STATES

The device complies with USB rev 1.1 power

management requirements.

It complies with I430 power management

requirements.

Due to inactivity on the USB bus for more than 3

ms, the device may enter into the SUSPEND

mode even if Reset signalling is not done yet.

The ST5481 recovers activity within the 15ms of

the resume signalling issued by the host or hub.

If wake up is enabled and occurs, the ST5481

recovers activity within the 15ms when it initiates

the resume (K state) and about the same time the

host or hub initiates a Reset (SEO for 10 ms).

Wake up ability concerns wake up of the USB bus

(resume event when the bus is in a suspend state)

from the S line through a line signal detection

done by the S interface.

Interface S states and relationship with Device

versus USB States.

M1: QUIET mode (initial mode if CFG1 = 0).

Figure 6 : S Interface States - CFG1=0

It means that S interface cannot be activated

neither by the host nor by a detection of signal on

line. This signal detection is disabled. The 15MHz

oscillator is not addressed to MACRO-S

M2: ACTIVE Mode.

When the device is in S6,S7,S8,S9 states from

USB point of view, the S interface may be in this

state, then it can be deactivated by a PDN

primitive (from host) or a hardware power down

which is generated by a suspend event on USB

bus

M3: INACTIVE Mode (initial mode if CFG1 = 1).

The line signal detection is enabled. Then it can

be activated (go to state ACTIVE) by a line signal

detection.

When USB is suspended, The S interface will

really be in the active mode once a resume

signalling has been done on USB bus after the

NLSD signal became active.

When USB is configured, a transition from this

mode to ACTIVE mode is obtained with a PUP

primitive (from host).

PON RESET /

USB REQUEST/

PIN RESET

STT(5)=1

M2

ACTIVE

M1 OFF

S LINE ACTIVATION

NOT POSSIBLE

STT(5)=0

PUP or NLSD=0

PDN or PDWN=1

STT(5)=1

M3

INACTIVE S LINE ACTIVATION

POSSIBLE

9/18

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