\chapter{Chip ID}
\label{id}


%-----------------------------------------------------------------------------
\section{Architecture}
\label{id:arch}


%-----------------------------------------------------------------------------
\section{Digital Interface}
\label{id:dig}

\register{CHIPID}{0x3160}{Chip ID read only}
{Chip ID read only}
{---- ---- ---- --WW WWWW WWPP PPPP PPPP}
{---- ---- ---- ---- ---- ---- ---- ----}
{
W & Wafer ID (8 bits)\\
P & Position on the wafer (10 bits)\\
}

Note: 

If not burned, all bits are '1'.

The CHIPID is available with some delay of about 150 $\mu$s after reset.

Bits 9..0 are used to code the position of the chip on the wafer (see Fig. \ref{fig:wmap}).

\begin{figure}[htb]
 \centering
 \includegraphics*[height=23cm]{chap_chipid/wmap.eps}
 \caption[Wafer map, the marked positions contain no TRAP chips]{Wafer map, the marked positions contain no TRAP chips}
 \label{fig:wmap}
\end{figure}

Bits 17..10 are used as wafer ID.

The laser has wavelength of ... nm. Two pulses with power of 720 (?) are required
for stable burn results.
