FLY E195, Service Menu

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E195 Service Menu
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3 Baseband
3.1 Baseband Overview
E195 Baseband mainly consists of CPUMSW8533N. MSW8533N baseband, the core
device of the mainboard, is responsible for the normal work among various parts of
mainboard, such as voice processing, image processing and MS communications.
Digital baseband MSW8533N contains 2-bit ARM7E kernel, 284Kbyte SRAM.
MSW8533N is enhanced GSM processor, in the internal integration, including channel
codec, interleaving/solution intertwined, and the encryption/decryption, channel codec
subsystem; including ARM7EJS and peripheral interface circuit, control processor
subsystem. Its external has 26 roots address line, 16 data line, eight chip selection lines,
provide 6 external center fracture port; 26 M / 52 M operating clock.
Analog baseband contains MSW8533N analog baseband chip, audio and baseband
codec. Three major functional blocks integrated internal: Audio codec including Voice
input / Output channel, Buzzer output; Baseband codec including Differential I, Q input /
output, GMSK modulation and A / D, D / A; Auxiliary parts including AFC DAC, RAMP
DAC, AGC DAC and a seven-channel A / D. And WATCHDOG interface is set internal to
enhance the stability of the system.
3.2 Logic
Logic part is composed of MTK base-band management chip MSW8533N, Power
management chip and NOR Flash.
„
MSW8533N
：
CPU
„
NOR Flash
：
H8ACS0PE0MBR-46M-C
3.3 Audio Frequency
Because MSW8533N inside integrates the audio processing, which makes the
performance of sound quality more conspicuous pleasing.
3.3.1 Speaker loop
Relative to the AUDIO CODEC, Speaker loop is simpler, only a PA and SPEKER. When
maintaining, pay attention to the signal waveform of PA input and output end.