ejtag.tex

simple MIPS EJTAG u-boot loader

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    pdfauthor={Thomas M. Sailer, HB9JNX/AE4WA},
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\title{AMD Alchemy EJTAG Tool}
\author{Thomas M. Sailer, HB9JNX/AE4WA}

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\tableofcontents

\section{JTAG Cable Pinout}

Refer to Table \ref{tab:jtagcable}. Pins 9 and 10 do not really
exist, but it is difficult to obtain ribbon cable header connectors
with only 8 pins. Busy is connected to ground, to allow cable
detection and to prevent any parport state machine from locking
up. nStrobe and nAck are connected together, for additional detection
and to avoid Parport state machine lockups.

\newcommand\negsig[1]{$\overline{\textrm{#1}}$}

\begin{table}[htbp]
  \centering
  \begin{tabular}{lrlr}
    \multicolumn{2}{c}{PIC Header} & \multicolumn{2}{c}{PC Parallel Port} \\
    Signal Name & Pin Number & Signal Name & Pin Number \\\hline%\vspace{\doublerulesep}
    \negsig{TRST}   &   1 & D3      &  5 \\
    GND             &   2 & GND     & 18 \\
    TDI             &   3 & D4      &  6 \\
    GND             &   4 & GND     & 19 \\
    TDO             &   5 & PError  & 12 \\
    GND             &   6 & GND     & 20 \\
    TMS             &   7 & D6      &  8 \\
    GND             &   8 & GND     & 21 \\
    TCK             &   9 & D7      &  9 \\
    GND             &  10 & GND     & 22 \\
    \negsig{RST}    &  11 & nInit   & 16 \\
    KEY             &  12 & GND     & 23 \\
    DINT            &  13 & nFault  & 15 \\
    VIO             &  14 & Select  & 13 \\
                    &     & Busy    & 11 \\
                    &     & GND     & 24 \\
                    &     & nStrobe &  1 \\
                    &     & nAck    & 10 \\
  \end{tabular}
  \caption{JTAG Cable}
  \label{tab:jtagcable}
\end{table}

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