# druc.1alc - Man Page

Design Rule Checker

## Synopsis

## Description

**DRuC** is a general parametrized VLSI design rule checker.

This tool replace the **VERSATIL** tool that is not anymore supported.

This manual presents the layout rules for tle **ALLIANCE** symbolic layout approach. The rules are described in a technology file defined by the environment variable **RDS_TECHNO_NAME** (see below).

The root cell and all the instantiated cells (except the intanciated libraries cells) must be in the current directory.

The default mode of **DRuC** is (currently) full flat: it first flatten all the hierarchy in order to obtain a flat, rectangle level description.

## Options

- -v
Verbose mode on. Each step of the DRC is output on the standard output

- -h
Hierarchical design rule checking. Generates lots of files locally, to be used by future invocation of druc. Don't ask me if and how this works, but since you also fetched the sources, ...

## Design Rules Description

**0: LAYER NAME.**

This section explicits the layer name used in the following rules.

- NWELL : N well - NTIE : N well polarisation - PTIE : P substrat polarisation - NDIF : N diffusion - PDIF : P diffusion - GATE : transistor gate - POLY : polysilicon wire - ALU1 : first level of metal - ALU2 : second level of metal - CONT : contact between ALU1 and POLY or DIFF - VIA : contact between ALU1 and ALU2

**I: LAYER WIDTH.**

This class of rules deals with the width limits of a layer. and the conditions for equipotentiality between two overlapping or abutting segments.

rule 1 : the minimum width for a segment of NWELL is 4 corresponding error codes are : 100 101 rule 2 : the minimum width for a segment of NTIE is 2 corresponding error code is : 119 rule 3 : the minimum width for a segment of PTIE is 2 corresponding error codes are : 122 123 rule 4 : the minimum width for a segment of NDIF is 2 corresponding error codes are : 140 141 rule 5 : the minimum width for a segment of PDIF is 2 corresponding error codes are : 165 166 rule 6 : the minimum width for a segment of GATE is 1 corresponding error codes are : 234 235 rule 7 : the minimum width for a segment of POLY is 1 corresponding error codes are : 234 235 rule 8 : the minimum width for a segment of ALU1 is 1 corresponding error codes are : 238 239 rule 9 : the minimum width for a segment of ALU2 is 2 corresponding error codes are : 242 243 rule 10 : the width of a CONT must be equal to 1 corresponding error codes are : 246 247 rule 11 : the width of a VIA must be equal to 1 corresponding error codes are : 261 262

**II: FORBIDDEN OVERLAP**

This class of rules specifies the forbidden overlaps between two layers. (The distance between them must be strictly positive)

rule 12 : contact between PTIE and NWELL is forbidden. corresponding error codes are : 126 127 128 129 130 131 rule 13 : contact between PTIE and NTIE is forbidden. corresponding error codes are : 133 134 135 136 137 138 rule 14 : contact between NDIF and NWELL is forbidden. corresponding error codes are : 144 145 146 147 148 149 rule 15 : contact between NDIF and NTIE is forbidden. corresponding error codes are : 151 152 153 154 155 156 rule 16 : contact between NDIF and PTIE is forbidden. corresponding error codes are : 158 159 160 161 162 163 rule 17 : contact between PDIF and NTIE is forbidden. corresponding error codes are : 169 170 171 172 173 174 rule 18 : contact between PDIF and PTIE is forbidden. corresponding error codes are : 176 177 178 179 180 181 rule 19 : contact between PDIF and NDIF is forbidden. corresponding error codes are : 183 184 185 186 187 188 rule 20 : contact between GATE and NTIE is forbidden. corresponding error codes are : 191 192 193 194 195 196 rule 21 : contact between GATE and PTIE is forbidden. corresponding error codes are : 198 199 200 201 202 203 rule 22 : contact between POLY and NTIE is forbidden. corresponding error codes are : 207 208 209 210 211 212 rule 23 : contact between POLY and PTIE is forbidden. corresponding error codes are : 214 215 216 217 218 219 rule 24 : contact between POLY and NDIF is forbidden. corresponding error codes are : 221 222 223 224 225 226 rule 25 : contact between POLY and PDIF is forbidden. corresponding error codes are : 228 229 230 231 232 233 rule 26 : contact between CONT and GATE or POLY is forbidden. corresponding error codes are : 249 250 251 252 253 rule 27 : contact between VIA and GATE is forbidden. corresponding error codes are : 264 265 266 267 268 269 rule 28 : contact between VIA and POLY is forbidden. corresponding error codes are : 271 272 273 274 275 276 rule 29 : contact between VIA and CONT is forbidden. corresponding error codes are : 278 279 280 281 282 283 rule 30 : contact between NTIE and NWELL is forbidden. corresponding error code is : 109 rule 31 : contact between PDIF and NWELL is forbidden. corresponding error code is : 117

**III: LAYER NOTCH.**

This class of rules deals with the notch limits of a layer.

rule 32 : the minimum notch for a segment of NWELL is 4 corresponding error code is : 102 rule 33 : the minimum notch for a segment of NTIE is 2 corresponding error code is : 120 rule 34 : the minimum notch for a segment of PTIE is 2 corresponding error code is : 124 rule 35 : the minimum notch for a segment of NDIF is 2 corresponding error code is : 142 rule 36 : the minimum notch for a segment of PDIF is 2 corresponding error code is : 167 rule 37 : the minimum notch for a segment of POLY is 1 corresponding error code is : 236 rule 38 : the minimum notch for a segment of ALU1 is 2.5 corresponding error code is : 240 rule 39 : the minimum notch for a segment of ALU2 is 2 corresponding error code is : 244

**IV: MINIMUM SPACING**

This class of rules specifies the minimum edge-to-edge distance allowed between two layers.

rule 40 : the minimum distance between NWELL and NWELL is 12 corresponding error code is : 118 rule 42 : the minimum distance between NTIE and NTIE is 3 corresponding error code is : 121 rule 43 : the minimum distance between PTIE and NWELL is 7.5 corresponding error code is : 125 rule 44 : the minimum distance between PTIE and NTIE is 8 corresponding error code is : 132 rule 45 : the minimum distance between PTIE and PTIE is 3 corresponding error code is : 139 rule 46 : the minimum distance between NDIF and NWELL is 7.5 corresponding error code is : 143 rule 47 : the minimum distance between NDIF and NTIE is 8 corresponding error code is : 150 rule 48 : the minimum distance between NDIF and PTIE is 3 corresponding error code is : 157 rule 49 : the minimum distance between NDIF and NDIF is 3 corresponding error code is : 164 rule 51 : the minimum distance between PDIF and NTIE is 3 corresponding error code is : 168 rule 52 : the minimum distance between PDIF and PTIE is 8 corresponding error code is : 175 rule 53 : the minimum distance between PDIF and NDIF is 8 corresponding error code is : 182 rule 54 : the minimum distance between PDIF and PDIF is 3 corresponding error code is : 189 rule 55 : the minimum distance between GATE and NTIE is 1 corresponding error code is : 190 rule 56 : the minimum distance between GATE and PTIE is 1 corresponding error code is : 197 rule 57 : the minimum distance between GATE and NDIF is 1 corresponding error code is : 204 rule 58 : the minimum distance between GATE and PDIF is 1 corresponding error code is : 205 rule 59 : the minimum distance between GATE and GATE is 2 corresponding error code is : 237 rule 60 : the minimum distance between POLY and NTIE is 1 corresponding error code is : 206 rule 61 : the minimum distance between POLY and PTIE is 1 corresponding error code is : 213 rule 62 : the minimum distance between POLY and NDIF is 1 corresponding error code is : 220 rule 63 : the minimum distance between POLY and PDIF is 1 corresponding error code is : 227 rule 64 : the minimum distance between POLY and GATE is 2 corresponding error code is : 237 rule 65 : the minimum distance between POLY and POLY is 2 corresponding error code is : 237 rule 66 : the minimum distance between ALU1 and ALU1 is 2.5 corresponding error code is : 241 rule 67 : the minimum distance between ALU2 and ALU2 is 2 corresponding error code is : 245 rule 68 : the minimum distance between CONT and CONT is 3 corresponding error code is : 254 rule 69 : the minimum distance between VIA and GATE is 2 corresponding error code is : 263 rule 70 : the minimum distance between VIA and POLY is 2 corresponding error code is : 270 rule 71 : the minimum distance between VIA and CONT is 2 corresponding error code is : 277 rule 72 : the minimum distance between VIA and VIA is 3 corresponding error code is : 284 rule 73 : the minimum distance between CONT and GATE or POLY is 1.5 corresponding error code is : 248

**V: TOTAL INCLUSION.**

The last class of rules deals with the inclusion of a layer in another one.

rule 74 : NTIE must be included in NWELL with a minimun margin of 0.5 corresponding error code is : 103 rule 75 : PDIF must be included in NWELL with a minimun margin of 0.5 corresponding error code is : 110

## Files

If design errors are found, **DRuC** produces the list of them in two files :

- <*root_name.drc*>:

This ascii file contains the list of DRC violations.

- <*root_name.iii*>:

This **gds** ro **cif** file contains only rectangles detected in violation.

( suffix iii is defined with the environment )

*RDS_OUT_PH* is default setted to gds.

## Environment Variables

**DRuC** uses several environment variables:

- MBK_IN_PH - defines the layout input format.

- RDS_OUT_PH - defines the layout output format.

- RDS_TECHNO_NAME - defines the technology file.

- MBK_CATA_LIB - defines the catalog directory.

See the corresponding manual pages for further information.

## Example

druc register

## Referenced By

nero.1alc(1), prol.5alc(5), ring.1alc(1).