1. Small Stand-Alone MP3 Player (SSMPP)

2. INTRODUCTION ● Portable MP3 Player with limited memory capacity used for storage and playback of a couple of favorite songs. ● Used for both indoor or outdoor entertainment. ● For outdoor: use earphones. ● For indoor: can be used with earphones while moving to any corner of the house; or can be used with amplifier and high-power speakers. ● Convenient to download songs using a PC on which Download Software is installed.

3. SPECIFICATIONS 1) Power supply: 3VDC battery source. 2) Sixteen Megabytes of flash memory to store MP3 data files. 3) PC Parallel Port interface to download MP3 files into internal memory. 4) User command buttons: On/Off, Download, Play, Stop, Volume Up, and Volume Down buttons. 5) Volume range: - Minimum level: -75 dB. - Maximum level: 18 dB. - Increment/decrement step: i) From the range [-75 dB, -54 dB]: +/- 3dB. ii) From the range [-54 dB, 18 dB]: +/-1.5 dB. 6) Download software: developed for Windows platforms. 7) Earphone and line-out audio outputs. 8) The SSMPP has no built-in power amplifier for speaker users. 9) Physical dimension: 1.25” x 5.6” x 8”.

4. THE DIAGRAM PC 25-pin line-out outputearphoneoutput commands reset on_off vol_upvol_down play download playdownload I2CI2Ccontrols vol[5:0] data[31:0] controls I2SI2S PI[9:2] rtr eod pr controls play_active dl_active data[7:0] controls stsweweoeoe data[7:0] controls addr[23:0] MP3 Files E28F128J3 Address Counter Flash Controller Download Logic Play Logic Parallel Port Interface MAS3507D DAC3550A I 2 C Master Logic Chip Controller Volume Controller User Command Logic User Commands Reset Parallel Port Connecto r Download Software Module

5. PCB LAYOUT

6. COMPLETED PRODUCT