# Timing scripts

A set of scripts for rcx and sta for caravel top level 

## Dependencies
- Docker

## Prerequisites

A set of exports are needed:
```bash
export CARAVEL_ROOT=${HOME}/caravel/
export MCW_ROOT=${HOME}/caravel_mgmt_soc_litex/
export CUP_ROOT=${HOME}/caravel_user_project/
export TIMING_ROOT=${HOME}/timing-scripts/
export PDK_ROOT=${HOME}/pdk/
export PDK=sky130A
export OPENLANE_IMAGE_NAME=efabless/openlane:4476a58407d670d251aa0be6a55e5391bb181c4e-amd64
```

python modules:
- `pyverilog`
- `click`

## Usage

### caravel_user_project

1. After exporting the prerequisites, run:

    ```
    make -f timing.mk list-rcx
    ```
    You should get `rcx-user_project_wrapper` amongst others such as: 

    ```
    rcx-buff_flash_clkrst
    rcx-caravel
    rcx-caravel_clocking
    rcx-constant_block
    rcx-digital_pll
    rcx-gpio_control_block
    rcx-gpio_defaults_block
    rcx-gpio_logic_high
    rcx-gpio_signal_buffering
    rcx-gpio_signal_buffering_alt
    rcx-housekeeping
    rcx-mgmt_protect
    rcx-mprj2_logic_high
    rcx-mprj_logic_high
    rcx-spare_logic_block
    rcx-RAM256
    rcx-mgmt_core_wrapper
    rcx-user_proj_example
    rcx-user_project_wrapper
    ```

2. extract multicorner spefs for `user_project_wrapper` and any other blocks inside:

    ```
    make -f timing.mk rcx-user_project_wrapper
    make -f timing.mk rcx-user_proj_example
    ```
3. generate spef mapping file for caravel_user_project:

    ```
    python3 ./scripts/generate_spef_mapping -i ${CUP_ROOT}/verilog/gl/user_project_wrapper.v -o ${CUP_ROOT}/env/spef-mapping.tcl --project-root '$::env(CUP_ROOT)' --pdk-root ${PDK_ROOT} --pdk ${PDK}
    ```

4. run sta:

    ```
    make -f timing.mk caravel-timing-typ
    make -f timing.mk caravel-timing-slow
    make -f timing.mk caravel-timing-fast
    ```

## Limitations

- Makefile
- Makefile
- Assumes a fixed folder structure for the exported directories
- Probably a lot of corner cases that weren't considered