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‎devel/comp/mfb_tools/debug/gen_loop_switch/readme.html

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By default the connection is ETH_RX->DMA_RX and DMA_TX->ETH_TX.
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It allows for loopback between ETH_RX->ETH_TX and DMA_TX->DMA_RX as well as
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connection of MFB generators on DMA_RX and ETH_TX.
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These generators have their own part of MI32 address space.</p>
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These generators have their own part of MI32 address space.
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Speed Meters (SM) are located on each MFB interface and occupy another part
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of the MI32 address space. Contrary to the MFB generators, Speed Meters’
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registers are implemented here (its MI wrapper is not used). In case the
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Speed Meters’ MI wrapper was used, address space would need to be adjusted as
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each wrapper contains seven MI registers instead of the current four.</p>
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<p><strong>Connection diagram:</strong></p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> <span class="o">+--------+</span> <span class="o">+---</span>\
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<span class="o">|</span> <span class="n">RX</span> <span class="n">Gen</span> <span class="o">+--+</span> <span class="mi">1</span> \ <span class="o">+---</span>\
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<span class="n">ETH_RX</span> <span class="o">+--------+</span> <span class="o">|</span><span class="n">MUX_C</span><span class="o">+------------+</span> <span class="mi">0</span> \ <span class="o">+------+</span> <span class="n">DMA_RX</span>
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<span class="o">&gt;--------------------------+------+</span> <span class="mi">0</span> <span class="o">/</span> <span class="o">|</span><span class="n">MUX_A</span><span class="o">+--+</span> <span class="n">FIFO</span> <span class="o">+------&gt;</span>
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<span class="o">|</span> <span class="o">+---/</span> <span class="o">+---+</span> <span class="mi">1</span> <span class="o">/</span> <span class="o">+------+</span>
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<span class="o">|</span> <span class="o">|</span> <span class="o">+---/</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">/---+</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">+------+</span> <span class="o">/</span> <span class="mi">1</span> <span class="o">+---+</span> <span class="o">/---+</span> <span class="o">|</span>
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<span class="o">&lt;------+</span> <span class="n">FIFO</span> <span class="o">+--+</span><span class="n">MUX_B</span><span class="o">|</span> <span class="o">/</span> <span class="mi">0</span> <span class="o">+------+--------------------------&lt;</span>
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<span class="n">ETH_TX</span> <span class="o">+------+</span> \ <span class="mi">0</span> <span class="o">+------------+</span><span class="n">MUX_D</span><span class="o">|</span> <span class="o">+-----------------+</span> <span class="n">DMA_TX</span>
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\<span class="o">---+</span> \ <span class="mi">1</span> <span class="o">+--+</span> <span class="n">TX</span> <span class="n">Gen</span> <span class="o">/</span> <span class="n">Player</span> <span class="o">|</span>
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\<span class="o">---+</span> <span class="o">+-----------------+</span>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> <span class="n">Left2Right</span> <span class="n">GLS</span> <span class="n">Stream</span>
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<span class="o">-----------------------------------&gt;&gt;</span>
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<span class="o">+--------+</span> <span class="o">+---</span>\
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<span class="o">|</span> <span class="n">RX</span> <span class="n">Gen</span> <span class="o">+--+</span> <span class="mi">1</span> \ <span class="o">+---</span>\
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<span class="n">ETH_RX</span> <span class="o">+------+</span> <span class="o">+--------+</span> <span class="o">|</span><span class="n">MUX_C</span><span class="o">+------------+</span> <span class="mi">0</span> \ <span class="o">+------+</span> <span class="o">+------+</span> <span class="n">DMA_RX</span>
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<span class="o">&gt;-------+</span> <span class="n">SM</span> <span class="mi">2</span> <span class="o">+----------------------+------+</span> <span class="mi">0</span> <span class="o">/</span> <span class="o">|</span><span class="n">MUX_A</span><span class="o">+--+</span> <span class="n">FIFO</span> <span class="o">+--+</span> <span class="n">SM</span> <span class="mi">0</span> <span class="o">+-------&gt;</span>
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<span class="o">+------+</span> <span class="o">|</span> <span class="o">+---/</span> <span class="o">+---+</span> <span class="mi">1</span> <span class="o">/</span> <span class="o">+------+</span> <span class="o">+------+</span>
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<span class="o">|</span> <span class="o">|</span> <span class="o">+---/</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="n">LEFT</span> <span class="o">|</span> <span class="o">|</span> <span class="n">RIGHT</span>
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<span class="o">|</span> <span class="o">|</span>
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<span class="o">/---+</span> <span class="o">|</span> <span class="o">|</span>
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<span class="o">+------+</span> <span class="o">+------+</span> <span class="o">/</span> <span class="mi">1</span> <span class="o">+---+</span> <span class="o">/---+</span> <span class="o">|</span> <span class="o">+------+</span>
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<span class="o">&lt;-------+</span> <span class="n">SM</span> <span class="mi">1</span> <span class="o">+--+</span> <span class="n">FIFO</span> <span class="o">+--+</span><span class="n">MUX_B</span><span class="o">|</span> <span class="o">/</span> <span class="mi">0</span> <span class="o">+------+----------------------+</span> <span class="n">SM</span> <span class="mi">3</span> <span class="o">+-------&lt;</span>
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<span class="n">ETH_TX</span> <span class="o">+------+</span> <span class="o">+------+</span> \ <span class="mi">0</span> <span class="o">+------------+</span><span class="n">MUX_D</span><span class="o">|</span> <span class="o">+-----------------+</span> <span class="o">+------+</span> <span class="n">DMA_TX</span>
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\<span class="o">---+</span> \ <span class="mi">1</span> <span class="o">+--+</span> <span class="n">TX</span> <span class="n">Gen</span> <span class="o">/</span> <span class="n">Player</span> <span class="o">|</span>
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\<span class="o">---+</span> <span class="o">+-----------------+</span>
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<span class="n">Right2Left</span> <span class="n">GLS</span> <span class="n">Stream</span>
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<span class="o">&lt;&lt;-----------------------------------</span>
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>There is a Python module as well as a tool for user-friendly access to its features.
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Just install the ofm package and use <cite>ofm-gls -h</cite> in the command line or import it like so:
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<cite>from ofm.comp.mfb_tools.debug.gen_loop_switch import GenLoopSwitch</cite>.</p>
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</div>
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<div class="admonition note">
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<p class="admonition-title">Note</p>
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<p>The sides of the GLS were renamed to make it more universal. The DMA side is on the RIGHT,
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ETH side is on the LEFT. This is used mainly in the GLS Python module: GenLoopSwitch.
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Instance of the GenLoopSwitch class contains two streams: l2r (left2right, prev. RX) and
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r2l (right2left, prev. TX).</p>
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</div>
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<p><strong>MI address offsets:</strong></p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="mh">0x000</span> <span class="o">--</span> <span class="n">RX</span> <span class="n">loopback</span> <span class="n">MUX_A</span> <span class="p">(</span><span class="mi">0</span> <span class="o">-&gt;</span> <span class="n">RX</span> <span class="n">stream</span><span class="p">,</span> <span class="mi">1</span> <span class="o">-&gt;</span> <span class="n">TX</span> <span class="n">stream</span> <span class="n">loopback</span><span class="p">)</span>
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<span class="mh">0x004</span> <span class="o">--</span> <span class="n">TX</span> <span class="n">loopback</span> <span class="n">MUX_B</span> <span class="p">(</span><span class="mi">0</span> <span class="o">-&gt;</span> <span class="n">TX</span> <span class="n">stream</span><span class="p">,</span> <span class="mi">1</span> <span class="o">-&gt;</span> <span class="n">RX</span> <span class="n">stream</span> <span class="n">loopback</span><span class="p">)</span>

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