1 2 3 <refentry id="nero"> 4 <?dbhtml filename="man_nero.html"> 5 6 <refmeta> 7 <refentrytitle>nero</refentrytitle> 8 <manvolnum>1</manvolnum> 9 <refmiscinfo>ASIM/LIP6</refmiscinfo> 10 </refmeta> 11 12 <refnamediv> 13 <refname> nero </refname> 14 <refpurpose> Negotiating Router </refpurpose> 15 </refnamediv> 16 17 18 <refsynopsisdiv> 19 <cmdsynopsis> 20 <command>nero</command> 21 <arg>-h</arg> 22 <arg>-v</arg> 23 <arg>-V</arg> 24 <arg>-c</arg> 25 <arg>-2</arg> 26 <arg>-3</arg> 27 <arg>-4</arg> 28 <arg>-5</arg> 29 <arg>-6</arg> 30 <arg>-L</arg> 31 <arg>-G</arg> 32 <sbr> 33 <arg>--help</arg> 34 <arg>--verbose</arg> 35 <arg>--very-verbose</arg> 36 <arg>--core-dump</arg> 37 <arg>--local</arg> 38 <arg>--global</arg> 39 <sbr> 40 <arg>-p <replaceable>placement</replaceable></arg> 41 <arg choice="req"><replaceable>netlist</replaceable></arg> 42 <arg choice="req"><replaceable>layout</replaceable></arg> 43 </cmdsynopsis> 44 </refsynopsisdiv> 45 46 47 <refsect1> 48 <title> Description </title> 49 50 <para> <literal>nero</literal> is a simple router suited for small 51 academic designs. Currently it can process designs of size up to 52 4K gates. 53 </para> 54 55 56 <refsect2> 57 <title> Global routing </title> 58 59 <para> A design is considered as <emphasis>big</emphasis> if it 60 contains nets which half perimeter is greater than 800 lambdas. 61 Global routing is used on big designs. 62 </para> 63 <para> In <literal>nero</literal>, "global routing" means that 64 the longuests nets are completly routed in a first step with only 65 routing layers numbers 3 & 4. Then the smaller nets are routed with all 66 avalaibles layers. This implies that when global routing is 67 used, the number of routing layers is forced to at least 4. 68 In each step, the nets are routed from the shortest to the 69 longuest with the same routing algorithm. 70 </para> 71 72 </refsect2> 73 74 75 </refsect1> 76 77 <refsect1> 78 <title> Invocation </title> 79 80 <para> <literal>nero</literal> mandatory arguments : 81 <itemizedlist> 82 <listitem> 83 <para> <filename>netlist</filename> : the name of 84 the design, whithout any extention. Please note that unless a 85 <userinput>-p</userinput> <filename>placement</filename> option 86 is given, the file holding the placement is expected to have the 87 same name as the netlist file (short of the extention). 88 </para> 89 </listitem> 90 <listitem> 91 <para> <filename>layout</filename> : the name of 92 the resulting routed layout. Be careful of not giving the same 93 name as the netlist, in this case the initial placement will be 94 silently overwritten. 95 </para> 96 </listitem> 97 </itemizedlist> 98 </para> 99 100 <para> <literal>nero</literal> optionnals arguments : 101 <itemizedlist> 102 <listitem> 103 <para> <userinput>-h</userinput>, <userinput>--help</userinput> : 104 print help. 105 </para> 106 </listitem> 107 <listitem> 108 <para> <userinput>-v</userinput>, <userinput>--verbose</userinput> : 109 be verbose. 110 </para> 111 </listitem> 112 <listitem> 113 <para> <userinput>-V</userinput>, <userinput>--very-verbose</userinput> : 114 be unbearably verbose. 115 </para> 116 </listitem> 117 <listitem> 118 <para> <userinput>-c</userinput>, <userinput>--core-dump</userinput> : 119 do not prevent the generation of core dumps in case of a crash. 120 Mostly used during the development stage. 121 </para> 122 </listitem> 123 <listitem> 124 <para> <userinput>-2</userinput>, 125 <userinput>-3</userinput>, 126 <userinput>-4</userinput>, 127 <userinput>-5</userinput>, 128 <userinput>-6</userinput> : set the numbers of layers 129 used for routing. The default for small designs is 2 and 4 for big 130 ones. When global routing took place, the router will uses at least 131 4 routing layers. 132 </para> 133 </listitem> 134 <listitem> 135 <para> <userinput>-L</userinput>, <userinput>--local</userinput> : 136 turn off the global routing stage, whatever the size of the design. 137 Be warned that this will enormously slow down the routing process. 138 </para> 139 </listitem> 140 <listitem> 141 <para> <userinput>-G</userinput>, <userinput>--global</userinput> : 142 turn on the global routing regardless of the size of the design. 143 </para> 144 </listitem> 145 <listitem> 146 <para> <userinput>-p</userinput> <filename>placement</filename>, 147 <userinput>--place</userinput> <filename>placement</filename> : 148 specify a name for the placement file different from the netlist 149 name. 150 </para> 151 </listitem> 152 </itemizedlist> 153 </para> 154 </refsect1> 155 156 157 <refsect1> 158 <title> Example </title> 159 160 <para> Route the netlist <literal>amd2901_core.vst</literal>, using 161 the placement file <literal>amd2901_core_p.ap</literal> and store the 162 result in <literal>amd2901_core_r</literal>. 163 <screen> 164$ <userinput>export MBK_IN_LO=vst</userinput> 165$ <userinput>export MBK_IN_PH=ap</userinput> 166$ <userinput>export MBK_OUT_PH=ap</userinput> 167$ <userinput>nero -V --place amd2901_core_p amd2901_core amd2901_core_r</userinput> 168 </screen> 169 </para> 170 171 </refsect1> 172 173 174 <refsect1> 175 <title>See Also</title> 176 177 <para> 178 <citerefentry> 179 <refentrytitle>MBK_IN_LO</refentrytitle> 180 <manvolnum>1</manvolnum> 181 </citerefentry>, 182 <citerefentry> 183 <refentrytitle>MBK_OUT_LO</refentrytitle> 184 <manvolnum>1</manvolnum> 185 </citerefentry>, 186 <citerefentry> 187 <refentrytitle>MBK_IN_PH</refentrytitle> 188 <manvolnum>1</manvolnum> 189 </citerefentry>, 190 <citerefentry> 191 <refentrytitle>MBK_OUT_PH</refentrytitle> 192 <manvolnum>1</manvolnum> 193 </citerefentry>, 194 <citerefentry> 195 <refentrytitle>ocp</refentrytitle> 196 <manvolnum>1</manvolnum> 197 </citerefentry>, 198 <citerefentry> 199 <refentrytitle>ocr</refentrytitle> 200 <manvolnum>1</manvolnum> 201 </citerefentry>, 202 <citerefentry> 203 <refentrytitle>druc</refentrytitle> 204 <manvolnum>1</manvolnum> 205 </citerefentry>, 206 <citerefentry> 207 <refentrytitle>cougar</refentrytitle> 208 <manvolnum>1</manvolnum> 209 </citerefentry> 210 </para> 211 212 </refsect1> 213 214 215 </refentry> 216