User Guide

RAE-6/RA-4
Nokia Customer Care 6 - Baseband Description and Troubleshooting
14 COMPANY CONFIDENTIAL Issue 1 12/04
Copyright © 2004 Nokia. All Rights Reserved.
Functional Description of APE
APE term includes not only the processor itself but also the peripherals around it, clocking, re-
setting and power management for these parts.
APE is based around OMAP1510 (Open Multimedia Application Platform) processor. Periph-
erals attached to OMAP1510 include:
• Audio DAC
• Bluetooth
• Cover display
•PDA display
• Memory card
•IrDA
• Cover keypad & command buttons
• QWERTY controller
• External SDRAM
• Flash memories
APE acts as a system slave compared to the CMT side. CMT holds the master reset and power
management logic. APE and CMT are connected through a serial link called XBUS.
■ Audio
Figure 3:RAE-6/RA-4 Audio architecture
As RAE-6/RA-4 is based on a dual-processor architecture, audios are also divided into APE
and CMT parts. Audio control is mostly on the APE side. Phone audio is routed from the CMT
side to APE in analog form. On the CMT side, audio HW is integrated into the UEMEK ASIC.
On the APE side, the most important parts are OMAP1510, audio DAC and audio power am-
plifier.
2
2
Tomahawk
1
1
2
2
2
1
I2S, Digital Audio;
4
Stereo or mono
digital audio
4
XABUS
CSR
BT
PCM
I2C
Control
McBSP Control, SPI Mode;
3
XBUS
UPP
DSP_SIO
UEM
D
A
D
A
L
P
L
P
MIC2
MIC1
MIC3
HF/HFCM
EARP/EARN
XEAR
Mic_In
R_Line_In
L_Line_In
R_HP_Out
L_HP_Out
R_Out
L_Out
TLV320AIC23B
UART2
BT
control
OMAP1510
MP3 decoder
Streaming
engine
Ringtones
Entertainment
effects
MCSI2
MCSI1
McBSP1
I2CI/F
McBSP2
UART1
LM4855
IHFIn
Phone HS
RIn
Lin
IHFOut
LOut
ROut
UART2
~10dB
Attenuator
1