Samsung Anycall SGH-N700 Servicehandleiding - Pagina 8
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Circuit Description
5) IF connetor
It is 18-pin connector, and separated into two parts. One is a power supply part for main system. And the other is
designed to use SDS, DEBUG, DLC-DETECT, JIG_ON, TA, VF, and GND. They connected to power supply IC,
microprocessor and signal processor IC.
6) Audio
AOUTAP, AOUTAN from CSP2200 is connected to the speaker via analog switch. MICIN and MICOUT are connected
to the main MIC.
YMU759 is a LSI for portable telephone that is capable of playing high quality music by utilizing FM synthesizer and
ADPCM decorder that are included in this device.
As a synthesis, YMU759 is equipped 16 voices with different tones. Since the device is capable of simultaneously
generating up to synchronous with the play of the FM synthesizer, various sampled voices can be used as sound effects.
Since the play data of YMU759 are interpreted at anytime through FIFO, the length of the data(playing period) is not
limited, so the device can flexibly support application such as incoming call melody music distribution service. The
hardware sequencer built in this device allows playing of the complex music without giving excessive load to the CPU of
the portable telephones. Moreover, the registers of the FM synthesizer can be operated directly for real time sound
generation, allowing, for example, utilization of various sound effects when using the game software installed in the
portable telephone.
YMU759 includes a speaker amplifier with high ripple removal rate whose maximum output is 550mW (SPVDD=3.6V).
The device is also equipped with conventional function including a vibartor and a circuit for controlling LEDs synchornous
with music.
7) Memory
This system uses AMD's memory, S71JL064H A 0B A W 110.
It is consisted of 64M bits flash memory and 16M bits PSRAM. It has 16 bit data line, D[0~15] which is connected to
trident, LCD or CSP2200. It has 22 bit address lines, A[0~21]. They are also connected. CP_CSROMEN signal, chip
select signal in the trident, enable flash memories. They use 2.8 volt supply voltage, VCCD.
During wrting process, CP_WEN is low and it enables writing process to flash memory and PSRAM. During reading
process, CP_OEN is low and it output information which is located at the address from the trident in the flash memory or
PSRAM to data lines. Each chip select signals in the trident select flash memory or PSRAM. Reading or writing
procedure is processed after CP_WEN or CP_OEN is enabled. Memories use RST. A[0] signal enables lower byte of
PSRAM and UPPER_BYTE signal enables higher byte of PSRAM.
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