Yamaha R-V702 R-V502 User Manual download pdf (Page 10)

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Circuit Description

2-6

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2-2-7. CSP2200

CSP2200 is integrated the timing and control functions for GSM 2+ mobile application with the ADC and DAC functions,

and power management block. The CSP2200 interfaces to the trident, via a 16-bit parallel interface. It serves as the

interface that connects a DSP to the RF circuitry in a GSM 2+ mobile telephone. DSP can load 148 bits of burst data

into CSP2200

’

s internal register, and program CSP2200

’

s event timing and control register with the exact time to send the

burst. When the timing portion of the event timing and control register matches the internal quarter-bit counter and internal

frame counter, the 148 bits in the internal 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 CSP2200

’

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. CSP2200 then notifies the DSP which has sample 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.

There are 7 LDOs which are power sources of microprocessor, LCD, etc. These 7 LDOs output are programmable.

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Yamaha R-V702 R-V502 User Manual Page 10