ML22Q533 datasheet(28/178 Pages) ROHM

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FEDL22Q53X-02

ML22Q53X

● Memory Allocation and Creating Sound Data

The flash memory is partitioned into four data areas: sound (i.e., phrase) control area, test area, sound area, and edit ROM

area.

The sound control area manages the sound data in the ROM. It contains data for controlling the start/stop addresses of sound

data for 4,096 phrases, use/non-use of the edit ROM function and so on.

The test area contains data for testing.

The sound area contains actual waveform data.

The edit ROM area contains data for effective use of sound data. For the details, refer to the section of "Edit ROM

Function".

The edit ROM area is not available if the edit ROM is not used.

The Sound data is created using a dedicated tool (Speech LSI Utility).

● Playback time and memory capacity

The playback time depends on the number of phrases, memory capacity, sampling frequency, and playback algorithm. The

relationship is shown below. However, this is the playback time when the edit ROM function is not used.

When the number of phrases is 1024, the sampling frequency is 16kHz, and the HQ-ADPCM algorithm is selected, the

playback time will be approximately 81 seconds.

Configuration of Flash Memory Data (4Mbit)

Edit ROM area

Depends on creation of sound

data.

Test area

0x00000

0x0007F

0x7FFFF

0x00080

Sound area

Sound control area (*)

(The number of phrases can be set

with the dedicated tools.)

0x0207F

0x02080

(*) When the number of phrases is set to 1024

The number of phrases can be set from 1024 to 4096 in 1024 units

using the dedicated tools.

1.024 × (Memory Capacity (kbit)-(0.0625 × Number of Phrases)-0.625)

Sampling frequency (kHz) × bit length

Playback Time =

(sec)

1.024 × (4096(kbit)- (0.0625×1024) - 0.625)

16 (kHz) × 3.2 (bit) (average)

Playback Time =

≒ 81 (sec)

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