\documentclass{waslides}
\usepackage[obeyspaces]{url}
\title{\LARGE Changes from GTA02 to gta02-core}
\author{Werner Almesberger \\
  \url{werner@openmoko.org}}

\begin{document}
\titleslide
\title{gta02-core changes}
\author{Werner Almesberger}

\head{Overview}
\begin{slide}
\blBul
  \item Glamectomy
  \item Modem change
  \item Audio fixes
  \item NOR removal
  \item Other cleanup
\elBul
\end{slide}


\head{Glamectomy}
\begin{slide}
\blBul
  \item Changes:
    \blCir
      \item Remove Glamo video decelerator
      \item Move WLAN from CPU SDIO to SPI
      \item Move microSD from Glamo MMC to CPU SD/SDIO/MMC
      \item Connect LCM to CPU
    \elCir
  \item Effects:
    \blCir
      \item Reduced capacitative bus load
      \item Much higher bandwidth between CPU and frame buffer
      \item No 2D acceleration
      \item Display refresh eats memory bandwidth
    \elCir
\elBul
\end{slide}


\head{Modem Change}
\begin{slide}
\blBul
  \item Motivation:
    \blCir
      \item Unlikely to get TI to allow open design
      \item Calypso is complex and obsolete
      \item Considered Option (3G), but expected difficult negotiations
    \elCir
  \item Change:
    \blCir
      \item Remove Calypso entirely
      \item Use Telit GE865 quad-band GSM BGA module
    \elCir
\elBul
\end{slide}


\head{Audio Fixes}
\begin{slide}
GTA02 had a large number of audio flaws:
\blBul
  \item EMI filters (buzz fix)
  \item Increase capacitors (bass fix)
  \item Remove audio amplifier
  \item Other, smaller changes
\elBul
\end{slide}


\head{NOR Removal}
\begin{slide}
\blBul
  \item Motivation:
    \blCir
      \item NOR is an exotic component
      \item NOR takes up space and loads the bus
      \item Future designs can use IROM or IDBG for debricking
    \elCir
  \item Change:
    \blCir
      \item Remove NOR
      \item Rely on Debug Board for debricking (for now), like in GTA01
    \elCir
\elBul
\end{slide}


\head{More Departures}
\begin{slide}
\blBul
  \item GPS antenna removal:
    \blCir
      \item External antenna doubles complexity of RF circuit
      \item Almost nobody uses it
      \item At least one known and non-trival to resolve bug in GTA02 \\
	(Incorrect voltage at antenna switch)
    \elCir
  \item Removal of second accelerometer:
    \blCir
      \item Nobody uses it
      \item Takes up precious space
      \item SPI bus multiplexing precarious at best
    \elCir
\elBul
\end{slide}


\head{Other Cleanup}
\begin{slide}
\blBul
  \item Bluetooth to main PCB:
    \blCir
      \item There is now space for it (like in GTA01Bv2)
      \item Greatly simplifies manufacturing
    \elCir
  \item WLAN to main PCB:
    \blCir
      \item There is now space for it
      \item Greatly simplifies manufacturing
    \elCir
\elBul
\end{slide}

\end{document}
