Samsung SGH-P100 Service Manual page 8

SG H- P100 Circuit Description
3. IF connetor
It is 24-pin connector, and uses 18-pin at present. They are designed to use SDS, DEBUG, DLC-DETECT, JIG_ON,
VEXT, VTEST, VF, CF, VBAT and GND. They connected to power supply IC, microprocessor and signal processor IC.
4. Audio
AOUTAP from CSP1093 is connected to the main speaker. AOUTAN is connected to the speaker via audio-amp.
AOUTBN and AOUTBP are connected to the ear-mic speaker via ear-jack. MICIN and MICOUT are connected to the
main MIC. And AUXIN and AUXOUT are connected to the Ear-mic.
YMU762MA3 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, YMU762MA3 is equipped 16 voices with differenttones. 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 YMU762MA3 are interpreted at anytime through FIFO, the length of the data(playing period) is
not limited, so the device can flexiblysupport 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.
For the headphone, it is provided with a stereophonic output terminal.
For the purpose of enabling YMU762MA3 to demonstarte its full capablities, Yamaha purpose to use "SMAF:Synthetic
music Mobile Application Format" as a data distribution format that is compatible wiht multimedia. Since the SMAF takes
a structure that sets importance on the synchronization between sound and images, various contents can be written into it
including incoming call melody with words that can be used for traning karaoke, and commercial channel that combines
texts, images and sounds, and others. The hardware sequencer of YMU762MA3 directly interprets and plays blocks
relevant to systhesis (playing music and reproducing ADPCM with FM synthesizer) that are included in data distributed in
SMAF.
5. Memory
This system uses SHARP ¡¯ s memory, LRS1828. It is consisted of 128M bits flash memory and 32M bits SCRAM.
It has 16 bit data line, D[0~15] which is connected to trident, LCD or CSP1093. It has 22 bit address lines, A[1~22].
They are connected too. CP_CSROMEN and CO_CSROM2EN signals, chip select signals in the trident enable two
memories. They use 3 volt supply voltage, V_ccd and 1.8 volt supply voltage, Vcc_1.8a in the PSC2006. During wrting
process, CP_WEN is low and it enables writing process to flash memory and SRAM. 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 SRAM to data
lines. Each chip select signals in the trident select memory among 2 flash memory and 2 SRAM. Reading or writing
procedure is processed after CP_WEN or CP_OEN is enabled. Memories use FLASH_RESET, which is buffered signal of
RESET from PSC2006, for ESD protection. A[0] signal enables lower byte of SRAM and UPPER_BYTE signal enables
higher byte of SRAM.
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