User Guide

RAE-6/RA-4

Nokia Customer Care 6 - Baseband Description and Troubleshooting

16 COMPANY CONFIDENTIAL Issue 1 12/04

APE audio

This mode is entered when user starts the multimedia application (e.g. MP3, AAC etc.), which

is played via IHF speaker or Pop-port

accessories.

Audio data from MMC is sent by OMAP1510 to the external audio DAC through the I

S con-

nection. The DAC performs the digital to analog audio conversion.

For playback via the internal speaker signal from DAC is routed to Phone_in_IHF input on

LM4855 audio power amplifier.

For playback via the stereo/ mono headset or other Pop-port

accessories signal from DAC

is routed to the L

inputs of the LM4855 audio power amplifier. In case of mono accessory

OMAP1510 will produce monophonic signal to DAC.

■ Internal interfaces

In practice, all APE internal interfaces consist of interfaces connected from OMAP1510 to pe-

ripheral devices. All UI related interfaces, memory interfaces, USB and MMC are covered in

separate sections of this document.

McBSP interfaces

OMAP1510 can support maximum of three independent Multi-channel Buffer Serial Ports

(McBSPs) interfaces. However, these ports are slightly different and particularly suitable for dif-

ferent purposes. McBSP1 supports I2S protocol and is connected to external audio codec.

McBSP#2 and #3 can be used as general purpose SPI interface supporting bit rates up to

5Mbits/s. McBSP2 is used to control the audio PA. McBSP3 clock output is used as audio co-

dec master clock. Other McBSP3 signals cannot be used because they are multiplexed with

µWire signals.

MCSI interfaces

The MCSI is a serial interface with multi-channels transmission capability. MCSI1 is used to

interface with Bluetooth and MCSI2 is used as XABUS (DSP-DSP bus between CMT and APE)

UART interfaces

OMAP1510 has three UART interfaces capable of 1.5Mbit/s data rates. UART1 is used as

Bluetooth control interface, UART2 is used as XBUS (MCU-MCU bus between CMT and APE),

UART3 includes 115.2 kbit/s IrDA modulation support, and is used to communicate with exter-

nal IrDA device.

µWire interface

The µWire interface is a standard serial synchronous bus protocol with two chip select lines.

Interface is used as PDA LCD control bus (CS3) and as a unidirectional data bus for the Cover

display (CS0).

The I

C is a half-duplex serial port using two lines, data and clock, for data communications

with software addressable external devices. I

C is used as audio codec. External keyboard

controller COP8 is also connected to APE via I