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Porta-AMP Portable Audio MP3 Player

Porta-AMP Portable Audio MP3 Player. By : Kevin Mlazgar Dan Leder Edmund Fung John Koob. What is MP3?. A compressed audio media format (11:1 lossy compression) MPEG (Motion Picture Experts Group) MP3 is the MPEG audio layer 3 standard

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Porta-AMP Portable Audio MP3 Player

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  1. Porta-AMPPortable Audio MP3 Player By : Kevin Mlazgar Dan Leder Edmund Fung John Koob

  2. What is MP3? • A compressed audio media format (11:1 lossy compression) • MPEG (Motion Picture Experts Group) MP3 is the MPEG audio layer 3 standard • Filters out frequencies which human ear can’t hear • Provides variable quality & compression of audio • The audio is compressed using Huffman encoding.

  3. Project Objectives • Ability to store multiple songs to Porta-AMP from a PC or integrated CDROM. • Ability to play, pause, and stop songs. • Display song name, number and the present state of the Porta-AMP on a LCD. • 128MB RAM for audio storage. • Audio streaming support using parallel port and CDROM.

  4. M A S T E R C O N T R O L Memory Management Interface Parallel Port Interface Keypad Interface LCD Interface CD-ROM Interface MP3 Interface Hardware Architecture

  5. LCD Driver • The first known implementation of a WORKING LCD driver, that can display multiple static screens. • Original implementation of the LCD Driver used nearly 570 logic blocks. • Current implementation uses ~200 logic blocks and is independent of the number of screens to be displayed. • Uses the EABs located on the FLEX10K to store the static screens.

  6. MP3 Decoder Interface • Create a 8 bit serial data stream from parallel data • Operates at ~1 MHz • The demand line is used to make data requests from the interface. • The decoded data is streamed to a DAC in I2S data format.

  7. CD-ROM Interface Goals • Read MP3 songs from a CD so that they can be downloaded to RAM or directly streamed by the Porta-AMP. • Ability to read an ISO-9660 level 2 CD. • Identifying all MP3 files on the CD which can be used by Porta-AMP. • Obtain filenames and display to LCD for user selection.

  8. CD-ROM Implementation • A CDROM controller was designed and simulated. • Due to time constraints and issues arising from the large scale integration of our project, the CDROM implementation has not been tested. • For more information see T13 Standards Committee Document from ANSI, where information on ATAPI is available.

  9. Parallel Port Interface • Three Parallel Port transmission modes: • SPP (Standard Parallel Port) – 40K-100KBytes/s • EPP (Enhanced Parallel Port) – ~1MBytes/s • ECP (Extended Capabilities Port) – 300K-800KB/s • The EPP bandwidth exceeds the requirements to provide MP3 streaming. • The PC and device should negotiate the transmission mode for IEEE 1284 compliance.

  10. DOS EPP Device Driver • In order to use EPP mode, the development of a custom device driver was required. • An attempt to use standard Windows printer drivers proved to be futile, due to unavailability of the IEEE-1284 standard ($120 from IEEE.org). • Instead, a driver was developed using C to upload files from the PC to the Porta-AMP. • After eradicating the effects of ringing and synchronizing the inputs, a reliable data link was achieved.

  11. Memory Interface • Currently interfacing 8MB of EDO DRAM. • A preliminary design for up to 128MB of PC100 SDRAM exists. • It was decided to implement DRAM due to time constraints and 3.3 to 5 V interfacing issues.

  12. DRAM Implementation • The memory interface abstracts all addressing and access to memory from the main modules of the Porta-AMP. • The Memory interface controller handles all reads and writes to memory via the RAS#, CAS#, and WEN# signal lines. • Handling of CBR refreshes are also taken care of by the controller.

  13. DRAM Implementation (2) • At this time only one song in memory is supported. • Preliminary design for a song table supporting multiple songs exists. • Each DRAM access takes 6-7 clock cycles when using a 25MHz clock frequency.

  14. Project Achievements • LCD Interface – working with multiple screens • Keypad Interface – samples key presses • MP3 Decoder Interface – tested with MCORE • CDROM – unable to test • Parallel Port Interface – complete file download • DRAM – read and write with memory refresh

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