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Add note about glitch filter

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David Shah 2017-11-25 10:20:54 +00:00
parent 6f2d9def4f
commit 3c49070269
1 changed files with 12 additions and 2 deletions
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docs/ultraplus.html
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@ -285,7 +285,8 @@ can be used as an open-drain IO using the standard IO cell.</p>
<h2>Hard IP</h2>
<p>The UltraPlus devices contain three types of Hard IP: I<sup>2</sup>C (<span style="font-family:monospace">SB_I2C</span>), SPI (<span style="font-family:monospace">SB_SPI</span>), and LED PWM generation
(<span style="font-family:monospace">SB_LEDDA_IP</span>). The connections and configurations for each of these blocks are documented below.</p>
(<span style="font-family:monospace">SB_LEDDA_IP</span>). The connections and configurations for each of these blocks are documented below. Names in italics are parameters rather than actual bits,
where multiple bits are used to enable an IP they are labeled as <span style="font-family:monospace"><em>_ENABLE_0</em></span>, <span style="font-family:monospace"><em>_ENABLE_1</em></span>, etc. </p>
<table class="multitab"><tr><td>
<table class="cstab">
<tr><th>Signal</th><th>I2C<br/>(0, 31, 0)</th><th>I2C<br/>(25, 31, 0)</th></tr>
@ -410,6 +411,15 @@ can be used as an open-drain IO using the standard IO cell.</p>
</td></tr></table>
</p>
<p>The I<sup>2</sup>C "glitch filter" is a seperate module from the I<sup>2</sup>C interface IP and needs to be reverse engineered seperately.
<p>The I<sup>2</sup>C "glitch filter" (referred to as <span style="font-family:monospace">SB_FILTER_50NS</span>) is a seperate module from the I<sup>2</sup>C interface IP, with connections as shown below:
<table class="ctab">
<tr><th>Signal</th><th>SB_FILTER_50NS<br/>(25, 31, 2)</th><th>SB_FILTER_50NS<br/>(25, 31, 3)</th></tr>
<tr><td>FILTERIN</td><td>(25, 27, lutff_1/in_0)</td><td>(25, 27, lutff_0/in_0)</td></tr>
<tr><td>FILTEROUT</td><td>(25, 27, slf_op_2)</td><td>(25, 27, slf_op_1)</td></tr>
<tr><td>ENABLE_0</td><td>(25, 30, CBIT_2)</td><td>(25, 30, CBIT_5)</td></tr>
<tr><td>ENABLE_1</td><td>(25, 30, CBIT_3)</td><td>(25, 30, CBIT_6)</td></tr>
<tr><td>ENABLE_2</td><td>(25, 30, CBIT_4)</td><td>(25, 30, CBIT_7)</td></tr>
</table>
</body></html>