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| author | Clifford Wolf <clifford@clifford.at> | 2015-12-04 11:46:08 +0100 |
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| committer | Clifford Wolf <clifford@clifford.at> | 2015-12-04 11:46:08 +0100 |
| commit | 9c9983cff8d5ff4c410b6f4fcd1c78b5f9e1fd6b (patch) | |
| tree | 1c2cf2da98e35c2e8bf2140116c4f6f3cdec5947 /docs/logic_tile.html | |
| parent | cddf6f94d7bd5e7c2466ec25623571f6d7a6b0fc (diff) | |
| download | icestorm-9c9983cff8d5ff4c410b6f4fcd1c78b5f9e1fd6b.tar.gz icestorm-9c9983cff8d5ff4c410b6f4fcd1c78b5f9e1fd6b.tar.bz2 icestorm-9c9983cff8d5ff4c410b6f4fcd1c78b5f9e1fd6b.zip | |
Added lutff_i/lout net to model
Diffstat (limited to 'docs/logic_tile.html')
| -rw-r--r-- | docs/logic_tile.html | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/docs/logic_tile.html b/docs/logic_tile.html index 67524bb..982b25d 100644 --- a/docs/logic_tile.html +++ b/docs/logic_tile.html @@ -228,8 +228,10 @@ or asynchronous exist for each logic cell individually. Each LUT <i>i</i> has four input wires <span style="font-family:monospace">lutff_<i>i</i>/in_0</span> to <span style="font-family:monospace">lutff_<i>i</i>/in_3</span>. Input <span style="font-family:monospace">lutff_<i>i</i>/in_3</span> can be configured to be driven by the carry output of the previous logic cell, or by <span style="font-family:monospace">carry_in_mux</span> in case of <i>i</i>=0. Input <span style="font-family:monospace">lutff_<i>i</i>/in_2</span> can be configured to -be driven by the output of the previous LUT for <i>i</i>>0. The LUT uses its 4 input signals to -calculate <span style="font-family:monospace">lutff_<i>i</i>/out</span>. +be driven by the output of the previous LUT for <i>i</i>>0 (LUT cascade). The LUT uses its 4 input signals to +calculate <span style="font-family:monospace">lutff_<i>i</i>/lout</span>. The signal is then passed through the built-in FF +and becomes <span style="font-family:monospace">lutff_<i>i</i>/out</span>. With the exception of LUT cascades, only the signal +after the FF is visible from outside the logic block. </p> <p> @@ -294,7 +296,7 @@ The LUT implements the following truth table: </p> <table class="ctab"> -<tr><th>in_3</th><th>in_2</th><th>in_1</th><th>in_0</th><th>out</th></tr> +<tr><th>in_3</th><th>in_2</th><th>in_1</th><th>in_0</th><th>lout</th></tr> <tr><td style="text-align:center">0</td><td style="text-align:center">0</td><td style="text-align:center">0</td><td style="text-align:center">0</td><td><span style="font-family:monospace">LC_<i>i</i>[4]</span></td></tr> <tr><td style="text-align:center">0</td><td style="text-align:center">0</td><td style="text-align:center">0</td><td style="text-align:center">1</td><td><span style="font-family:monospace">LC_<i>i</i>[14]</span></td></tr> <tr><td style="text-align:center">0</td><td style="text-align:center">0</td><td style="text-align:center">1</td><td style="text-align:center">0</td><td><span style="font-family:monospace">LC_<i>i</i>[15]</span></td></tr> |