Portable Linux Based Audio Player Core Board based on Freescale IMX233

Processor: Freescale MCIMX233CAG4B ARM9 Integrated System on Chip
Memory: Micron MT46V32M16P-75L DDR1 64MB 16-bit wide
Media: Micro Secure Digital (firmware)
External Interface: USB mini-B target
Internal Expansion: 50 conductor board/board connector, 0.65mm pitch
Audio: 3.5mm stereo headphone jack
Power: Li-Ion battery 1800mAH; USB bus power
Misc: ROM Patch Flash, SPI Flash Option, Debug Interface
Board: 40x60mm 4 layers; Design Rules: trace/space 6/6mil, via ring/finished hole 24/10mil, 1.6mm thick

This board contains the core functionality for a Linux Based
Portable Audio Decoder.  In particular addition of a daughter
board containing LCD and switch/rotary input devices is assumed
to create a fully functional device.

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0.01 Preliminary snapshot of schematic and board design

TODO:
	Layout debug connector
	Decide use of SPI Flash
	Determine exact connector footprint and stay-out for 1.25mm connectors
	DC block for HP out(?)
	Change from TH to SMD USB-B connector
	Fix connector pin numbering

MISC:
	LCD system mode drive appears to be missing "E" clock for 68xx mode