PIC16F877 based MP3 Player

[faizzaq]

pic16f877a mp3 player

I am designing an MP3 Player which has the following setup:

USB Interface
MMC - Memory Unit
PIC16F877 - CPU
STA013 - MP3 Decoder
CS4334 - D/A Converter
TPA6021A4 - Audio Power Amplifier
Keypad

Below is the function block diagram.

I wanna know if there is any fault in the basic block diagram; like; If TPA6021A4 is the correct choice for an audio amplifier, etc.

Moreover, I have some other questions as well.

1 - Can we use any audio amplifier chip??? Is the one I am using alright for this project???

2 - Is the choice for D/A Converter right???

3 - Is there any IC that provides the USB interface??? I think there is an IC for USB interface provided by MicroChip but I dont know the number???

4 - What are the essential items that are needed for transferring the MP3 data from the computer to the MMC via USB port??? In short, how can I develop the USB interface??? I have no knowledge regarding this.

5 - What is the difference between STA013 and STA015??? Can I use any of them??? Are they inter-compatible???

6 - How a MMC should be selected??? Is it based upon the particular file system supported by it??? Does it have any affect on the programming???

Plz help me!

Regards!