# Read UPF Utility

This module contains functionality to read, and modify information
from Unified Power Format (UPF) files. 

## Commands

```{note}
- Parameters in square brackets `[-param param]` are optional.
- Parameters without square brackets `-param2 param2` are required.
```

### Read UPF

Sources the UPF file. 

```tcl
read_upf
    -file file
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-file` | Path to `.upf` file. |

### Create Power Domain

```tcl
create_power_domain
    [-elements elements]
    name 
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-elements` | List of module paths that belong this this domain OR `*` for top domain. |
| `name` | Domain name. |

### Create Logic Port

```tcl
create_logic_port
    [-direction direction]
    port_name
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-direction` | Direction of the port (`in`, `out`, `inout`). |
| `port_name` | Port name. |

### Create Power Switch

```tcl
create_power_switch
    [-domain domain]
    [-output_supply_port output_supply_port]
    [-input_supply_port input_supply_port]
    [-control_port control_port]
    [-on_state on_state]
    name
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-domain` | Power domain name. |
| `-output_supply_port` | Output supply port of the switch. |
| `-input_supply_port` | Input supply port of the switch. |
| `-control_port` | Control port on the switch. |
| `-on_state` | One of {`state_name`, `input_supply_port`, `boolean_expression`}. |
| `name` | Power switch name. |

### Create or Update Isolation Strategy

```tcl 
set_isolation
    [-domain domain]
    [-applies_to applies_to]
    [-clamp_value clamp_value]
    [-isolation_signal isolation_signal]
    [-isolation_sense isolation_sense]
    [-location location]
    [-update]
    name
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-domain` | Power domain |
| `-applies_to` | Restricts the strategy to apply one of these (`inputs`, `outputs`, `both`). |
| `-clamp_value` | Value the isolation can drive (`0`, `1`). |
| `-isolation_signal` | The control signal for this strategy. |
| `-isolation_sense` | The active level of isolation control signal. |
| `-location` | Domain in which isolation cells are placed (`parent`, `self`, `fanout`). |
| `-update` | Only available if using existing strategy, will error if the strategy doesn't exist. |
| `name` | Isolation strategy name. |

### Set Interface cell

```tcl 
use_interface_cell
    [-domain domain]
    [-strategy strategy]
    [-lib_cells lib_cells]
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-domain` | Power domain name. |
| `-strategy` | Isolation strategy name. |
| `-lib_cells` | List of lib cells that could be used. |

### Set Domain Area

```tcl
set_domain_area
    domain_name
    -area {llx lly urx ury}
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `domain_name` | Power domain name. |
| `-area` | x-/y- coordinates in microns for the lower left and upper right corners of the power domain area. |


### Map existing power switch

```tcl 
map_power_switch
    [-switch_name_list switch_name_list]
    [-lib_cells lib_cells]
    [-port_map port_map]
```

#### Options

| Switch Name | Description | 
| ----- | ----- |
| `-switch_name_list` |  A list of switches (as defined by create_power_switch) to map. |
| `-lib_cells` | A list of library cells that could be mapped to the power switch |
| `-port_map` | A map that associates model ports defined by create_power_switch to logical ports |

## Example scripts

Example script demonstrating how to run `upf` related commands can be found here:

```tcl
./test/upf_test.tcl
```

## Regression tests

There are a set of regression tests in `./test`. For more information, refer to this [section](../../README.md#regression-tests). 

Simply run the following script: 

```shell
./test/regression
```

## Limitations

## FAQs

Check out [GitHub discussion](https://github.com/The-OpenROAD-Project/OpenROAD/discussions/categories/q-a?discussions_q=category%3AQ%26A+upf)
about this tool.

## License

BSD 3-Clause License. See [LICENSE](LICENSE) file.