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ML2502

RECORD/PLAYBACK LSI with 128Kbit Analog Cell Storage Flash Memory

Oki Electric Industry 

OKI

n Record/Playback Operation

ML2502

ML2502 has two record/playback modes, Dual-phrase record/playback mode and Single-

phrase record/playback mode. While in Dual-phrase record/playback mode the total memory

space is divided evenly into two areas for 2-phrase record/playback, the entire memory space

is used for one phrase record/playback in Single-phrase record/playback mode.

In Dual-phrase record/playback mode the first half of the memory, i.e. from the top address up

to the center address, is assigned to Phrase 1, and the second half, i.e. from the center

address to the last address, is assigned to Phrase 2. Record/playback of Phrase 1 can be

controlled via the REC1 and PLAY1 pins, while Phrase 2 can be controlled via the REC2 and

PLAY2 pins respectively.

In Single-phrase mode record/playback must be performed with the REC1 being connected to

the REC2 pin and the PLAY1 being connected to the PLAY2 pin respectively.

In both playback modes repetitive playback function for the same phrase is available.

1. Dual-Phrase Record/Playback Mode

1.1 Phrase 1 Recording Operation

(1) Keep on inputting “H” level to the REC1 pin to power up and start recording from the top

address of the memory. Recording goes on while the REC1 pin being held “H” level.

(2) The LSI automatically ends recording when the center address has been reached.

(3) The LSI automatically shifts to low-power consumption mode after recording ends.

(4) To stop recording for phrase 1 before reaching the center address, bring the REC1 pin

down to “L” level. The LSI automatically shifts to low-power consumption mode after

recording stops.

(5) During recording operation any signal input to other pins than the REC1 is disregarded.

Note: Re-recording always causes to overwrite the existing recording data for a given

phrase.

REC1

Start

Invalid Input

Stop

REC2

MON

Status Power Down Powering Up

Recording

Powering Down Power Down

Stopping Process

Figure 1.1 Timing Chart for Phrase 1 Recording Operation

ML2502 Data Sheet (Revision 8.0)

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