User Guide

NEM-2

System Module and User Interface CCS Technical Documentation

Phone- Audio Player Interface (MADI)

Phone- Audio Player interface consists of different signals groups:

• power and reset

• wake- up

• communication

•audio

Power and Reset

Three signals are used for Audio Player power supply control and reset:

• AudioPlayerPwrEnable

• AudioPlayerResetX

• AudioPlayerFlashRPX

AudioPlayerPwrEnable controls power supply of Audio Player. It is active high, default

state after reset is low. Phone software can switch Audio Player power supply on by pull-

ing AudioPlayerPwrEnable high.

AudioPlayerResetX controls ADSP reset. It is connected to open drain output Klight of

UEMK asic and ResetX signal of ADSP. External pull-up resistor is used the signal is

active low.

AudioPlayerFlashRPX controls flash reset/ sleep mode input. It is used either for disabling

flash during USB booting or for flash sleep mode control during run time. Therefore it is

connected to open drain output Dlight of UEMK asic, GPIO2 of ADSP and RPX signal of

flash memory. External pull- up resistor is used the signal is active low.

Wake- Up

Transitions from sleep mode into operation mode are triggered by so called wake- up sig-

nals. All wake- up signals are connected to UPP. Wake- up signals distributed from Audio

Player part are:

• LineInDetection

• USBWakeUp

LineInDetection is connected to switch inside line- in connector and UPP GenIO13.

Switch is open when line- in plug is inserted. Therefore LineInDetection signal is active

high.

USBWakeUp is connected to Vbus signal of USB connector and UPP GenIO14. LineInDe-

tection signal goes high if USB host is connected and power is supplied on USB Vbus pin.

Therefore USBWakeUp signal is active high.