---
name: "lotrs"
section: "3"
platform: "linux"
package: "alliance"
version: "5.1.1-3"
release: "Debian 10 (Buster)"
platforms: ["linux"]
url: "https://new.carta.tech/lotrs"
---

# lotrs(3)

mbk logical transistor

## NAME

lotrs - mbk logical transistor

## DESCRIPTION

The **lotrs** is used to describe a logical transistor. It is mostly used to describe leaf cells in terms of transistors interconnections, and as a result of layout extractions. Since the only target technology is CMOS, only NMOS and PMOS transistors are used.

The declarations needed to work on **lotrs** are available in the header file *"/labo/include/mlo.h"*.

The following C structure supports the description of the logical transistor :

```
typedef struct lotrs {
	struct lotrs	∗NEXT;
	struct locon	∗DRAIN;
	struct locon	∗GRID;
	struct locon	∗SOURCE;
	struct locon	∗BULK;
	char	∗TRNAME;
	long	X,Y;
	unsigned short	WIDTH, LENGTH;
	unsigned short	PS, PD;
	unsigned short	XS, XD;
	char	TYPE;
	struct ptype	∗USER;
} lotrs_list;
```

- *NEXT*

  Pointer to the next **lotrs** of the list.

- *DRAIN*

  Pointer to the drain connector of the transistor. This connector is, of course unique. See [**locon**(3)](/locon/3.md) for details.

- *GRID*

  Pointer to the grid connector of the transistor. This connector is, of course unique. See [**locon**(3)](/locon/3.md) for details.

- *SOURCE*

  Pointer to the source connector of the transistor. This connector is, of course unique. See [**locon**(3)](/locon/3.md) for details.

- *BULK*

  Pointer to the bulk connector of the transistor. This connector is, of course unique. See [**locon**(3)](/locon/3.md) for details.

- *TRNAME*

  Transistor instance name

- *X, Y*

  Coordinates of the transistor in a layout. These informations have sens only if the transistor netlist is the result of a layout extraction. They are otherwise set to zero. These coordinates are given in micron times the scale factor **SCALE\_X**, since the extracted view is technology dependant.

- *WIDTH, LENGTH*

  Respectivly width and length of the transistor grid.

- *PS, PD*

  Respectivly perimeter of the source and drain, in micron times the scale factor **SCALE\_X**.

- *XS, XD*

  These values are needed to compute respectivly the source and drain areas. Let *As* be the source area in square microns, and *Width* be the transistor grid width in micron, then *lotrs-\>XS = As / Width \* SCALE\_X*

- *TYPE*

  Canal type of the transistor. Six legal values are available :

  - **TRANSN**

    N type MOS transistor

  - **TRANSP**

    P type MOS transistor

  - **TRANSN\_FAST**

    High speed N type MOS transistor

  - **TRANSP\_FAST**

    High speed P type MOS transistor

  - **TRANSN\_HVIO**

    Low Leakage N type MOS transistor

  - **TRANSP\_HVIO**

    Low Leakage P type MOS transistor

- *USER*

  Pointer to a ptype list, see [**ptype**(3)](/ptype/3.md) for details,  that is a general purpose pointer used to share informations on the transistor.

- Remark :

  In integrated techniques, NMOS transistor bulk for digital circuits is always set to ground, and PMOS transistor bulk for digital circuits is always set to positive supply.

## SEE ALSO

**mbk**(1), [**addlotrs**(3)](/addlotrs/3.md), [**dellotrs**(3)](/dellotrs/3.md), [**locon**(3)](/locon/3.md), [**lofig**(3)](/lofig/3.md), [**ptype**(3)](/ptype/3.md).