QS6400 データシートの表示（PDF） - Unspecified

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QS6400

Advanced ADPCM SOUND DSP for Mobile

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QS6400

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3- 2 Description of Blocks

Explanations about each block of QS6400 and flows of the signal are as follows.

1) Register Block : QS6400 has registers of 32 x 8 for storing control data.

Built-in 8052 can communicate directly with the register blocks,

which are used to change control values and communicate commands.

23 x 8 registers are used for this purpose.

The extra registers are available to support additional features.

2) SMF FIFO buffer : This FIFO is used in receiving SMF file blocks (128bytes) from Host.

SMF FIFO Buffer has two banks of memory block and each buffer is

filled with data according to REG_IREQ_TYPE (When bit 2 is "1" ) from

built- in 8052. When receiving a data request (IRQB) for the next

procedure you should read the interrupt request type register

(REG_IREQ_TYPE) to check which data is required.

3) WAVE FIFO buffer : This FIFO is used in receiving wave data blocks (64 or 128 bytes)

from Host. WAVE FIFO Buffer has four banks of memory block, of 64

bytes each. The buffer size is determined by user specification (using

REG_WAVE_CHAN). Each bank is filled with wave data accoding to

REG_IREQ_TYPE( when bit 1 or bit 0 is "1") If you intend to play

high-sampling-rate(up to 22khz) wave files, we recommend that you

use only one wave channel, due to the high transmission rate of data.

In this case, WAVE FIFO Buffer size is preset to 128bytes.

4) Power control : This block is in charge of power management.

You can select whether to enter or wake-up from power down mode.

5) Clock generator : This block is a clock generator for the internal master clock.

QS6400 need the external clock input to operate normally.

6) CPU & ROM : This block describes 8052 micom and 12k bytes program ROM memory.

Built-in 8052 interprets SMF and Wave file.

7) PWM Speaker out : This block converts audio data into PWM format.

It supports stereophonic audio out.

You can also mute this output.

8) Earphone out : This block converts audio data into single-ended earphone signal.

You should connect poled-capacitor and bypass capacitor.

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