User Guide

Issue 1 12/04 COMPANY CONFIDENTIAL 13
Copyright © 2004 Nokia. All Rights Reserved.
RAE-6/RA-4
6 - Baseband Description and Troubleshooting Nokia Customer Care
Figure 2:Simplified CMT baseband block diagram
■ Interfaces between CMT and APE
XBUS
XBUS is the main communication interface between the CMT and APE parts of RAE-6/RA-4.
This 6-pin interface is implemented using UART2 of OMAP1510 (APE), LPRFUART of UPP
(CMT) and 2 general purpose I/O pins from both ASICs.
XABUS
XABUS is a synchronous serial interface which is used for uncompressed PCM audio data
transfer between the DSPs of UPP (CMT) and OMAP1510 (APE). This interface utilises the
DSPSIO of UPP and the MCSI_2 of OMAP1510. In addition to these one UPP GenIO and two
dedicated pins of OMAP1510 are needed for XABUS clock generation and control.
UEMK
StUF
Stacked UPP +
Flash
RF-BB
IF
CMT - APE interface
XBUS
XABUS
PUR delay
+ lvl shift
PURX SleepClk
CBUS
DBUS
FBUS
MBUS
Audio IF
Internal SIM IF
Zocus
RFConvIF
RFConv
RFIC
Control
RF
Control
RFClk
BATT. IF CHRG. IF
UEMEK
CHRG
current
sense
SIM
PWR on key
EAR
MIC
Audio
AMP
Audio
DAC
L+R
Control
from APE
IHF
XEAR
Audio
DAC
System Connector
L+R
32kH
z
Prod/AS
Test IF
FBUS
MBUS
64Mb
Flash
MIC+ACI
1.8V/3V
SleepClk
32kHz lvl
shift