Core_EDA

# Database db dbProject

## dbProject and multi-scenario {TBD) 

## difference of lib_cell, lib_pin, phys_pin, etc.

![](clipboard-202503140018-li4w0.png)

## dbTech mask and layer difference

1. mask is relatively fixed index for metal wire and via:

`metall, vial2, metal2, via23 ...`

2. layer name is defined by user in tech file:

`set—layer -name {Ml} -layer—num 5 -mask—num l`

In GUI, layer panel shows "Ml", you may access this layer by:

```

% get_tf_layers

 or

(gdb)  p  (utGV::GetTech(O))->Getlayer("Ml")

(gdb) p (utGV::GetTech(O))->Get.layerByMaskName("metall") 

```

returns same db.layer

![](clipboard-202503140020-lorpv.png)

## Functionality of db flags

|dbFlagName |dbFlagDesc |

|--|--|

| _flags._isleaflnst | not a hier structure, like xor or and gate |

| _ms._module->_virtuallibCell |  |

| _portTFlags._useAsTerm | when constrants be added on port |

| _portTFlags._useTmplsolator |  |

Files	

metal_layer.png	616 KB	2023-01-13	Jun CHEN

db_lib_cell_and_pin.jpg	130 KB	2023-02-02	Jun CHEN