M
ODEL
SL900A V
ERSION
V_1.0
P
REPARED BY
H/W
D
ATE
2006.06.30
S
UBJECT
T
ECHNICAL
M
ANUAL
P
AGE
29/51
SL900A
T
ECHNICAL
M
ANUAL
Figure 25. The block diagram of the digital circuits for Audio Front-End
Stereo sound are implemented by TS4990 IC(Audio amplifier).
SL900A
used single speaker. The AU_Out0_N/_P lines are for Voice Audio and AU_MOUTL/R are for Ring
Tone and Melody(Midi and MP3).
8.
Radio Interface Control
This chapter details the MT6226M interface control with the radio part of a GSM terminal. Providing a
comprehensive control scheme, the MT6226M radio interface consists of Baseband Serial Interface(BSI),
Baseband Parallel Interface(BPI), Automatic Power Control(APC) and Automatic Frequency Control(AFC),
together with APC-DAC and AFC-DAC.
8.1
Baseband Serial Interface
The Baseband Serial Interface controls external radio components. A 3-wire serial bus transfers data to RF
circuitry for PLL frequency change, reception gain setting and other radio control purposes. In this unit,
BSI data registers are double-buffered in the same way as the TDMA event registers. The user writes data
into the write buffer and the data is transferred from the write buffer to the active buffer when a
TDMA_EVTVAL signal(from the TDMA timer) is pulsed.
The unit has four output pins : BSI_CLK is the output clock, BSI_DATA is the serial data port and
BSI_CS0,BSI_CS1 are the select pins for 2 external components. These outputs are connected to MT6129
Transceiver.
Summary of Contents for SL900A
Page 1: ...SL900A SL900A ...
