## table of contents

DRUC(1) | ALLIANCE USER COMMANDS | DRUC(1) |

# NAME¶

druc - Design Rule Checker

# SYNOPSIS¶

**druc** *input_name* [ *-v* ] [ *-h* ]

# ORIGIN¶

This software belongs to the ** ALLIANCE CAD SYSTEM**
developed by the ASIM team at

**LIP6**laboratory of Université Pierre et Marie CURIE, in Paris, France.

Web : *http://asim.lip6.fr/recherche/alliance/*

E-mail : *alliance-users@asim.lip6.fr*

# 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 bellow).

The root cell and all the instanciated 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¶

# 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 4corresponding 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 12corresponding 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 0.5corresponding 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 informations.

# EXAMPLE¶

druc register

# BUG REPORT¶

This tool is under development at the **ASIM** department of
the **LIP6** laboratory.

We need your feedback to improve documentation and tools.

October 1, 1997 | ASIM/LIP6 |