ISP1161ABD datasheet(84/134 Pages) PHILIPS

Part #	ISP1161ABD

Description	Full-speed Universal Serial Bus single-chip host and device controller

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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Philips Semiconductors

ISP1161A

Full-speed USB single-chip host and device controller

Product data

Rev. 03 — 23 December 2004

84 of 134

9397 750 13962

11.4.2

Resume conditions

A wake-up from the suspend state is initiated either by the USB host or by the

application:

• USB host: drives a K-state on the USB bus (global resume)

• Application: remote wake-up through a HIGH level on input WAKEUP or a LOW

level on input CS, if enabled using bit WKUPCS in the DcHardwareConﬁguration

register. Wake-up on CS will work only if VBUS is present.

The steps of a wake-up sequence are as follows:

1. The internal oscillator and the PLL multiplier are re-enabled. When stabilized, the

clock signals are routed to all internal circuits of the ISP1161A.

2. The SUSPEND output is deasserted, and bit RESUME in the DcInterrupt register

is set. This will generate an interrupt if bit IERESM in the DcInterruptEnable

register is set.

3. Maximum 15 ms after starting the wake-up sequence, the ISP1161A DC

resumes its normal functionality.

4. In case of a remote wake-up, the ISP1161A DC drives a K-state on the USB bus

for 10 ms.

5. Following the deassertion of output SUSPEND, the application restores itself and

other system components to the normal operating mode.

6. After wake-up, the internal registers of the ISP1161A DC are write-protected to

prevent corruption by inadvertent writing during power-up of external

components. The ﬁrmware must send an Unlock Device command to the

ISP1161A DC to restore its full functionality.

11.4.3

Control bits in suspend and resume

Table 69:

Summary of control bits

Register

Bit

Function

DcInterrupt

SUSPND

a transition from awake to the suspend state was detected

BUSTATUS

monitors USB bus status (logic 1 = suspend); used when

interrupt is serviced

RESUME

a transition from suspend to the resume state was detected

DcInterrupt

Enable

IESUSP

enables output INT to signal the suspend state

IERESM

enables output INT to signal the resume state

DcMode

SOFTCT

enables SoftConnect pull-up resistor to USB bus

GOSUSP

a HIGH-to-LOW transition enables the suspend state

DcHardware

Conﬁguration

EXTPUL

selects internal (SoftConnect) or external pull-up resistor

WKUPCS

enables wake-up on LOW level of input CS

PWROFF

selects powered-off mode during the suspend state

DcUnlock

all

sending data AA37H unlocks the internal registers for

writing after a resume

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