Samsung SGH-X430 Service Manual page 12

2. SGH-X430 Circuit Description
register are GMSK modulated according to GSM 2+ standards. The resulting
phase information is translated into I and Q differential output voltages that can
be connected directly to an RF modulator at the TXOP and TXON pins. The
DSP is notified when the transmission is completed. For receiving baseband
data, a DSP can program CSP1093' s event timing and control register with the
exact time to start receiving I and Q samples through TXIP and TXIN pins.
When that time is reached, the control portion of the event timing and control
register will start the baseband receive section converting I and Q sample
pairs. The samples are stored in a double-buffered register until the register
contains 32 sample pairs. CSP1093 then notifies the DSP which has ample time
to read the information out before the next 32 sample pairs are stored. The
voice band ADC converter issues an interrupt to the DSP whenever it finishes
converting a 16-bit PCM word. The DSP then reads the new input sample and
simultaneously loads the voice band output DAC converter with a new PCM
output word. The voice band output can be connected directly to a speaker via
AOUTAN and AOUTAP pins and be connected to a Ear-mic speaker via
AOUTBN and AOUTBP pins.
8) X-TAL(13MHz)
This system uses the 13MHz TCXO, TCO-9141B, Toyocom. AFC control signal
form CSP1093 controls frequency from 13MHz x-tal. It generates the clock
frequency. This clock is fed to CSP1093,Trident,YMU762 and Silab solution.
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