| --- | |
| title: "PINMUX DV document" | |
| --- | |
| ## Goals | |
| * **DV**: | |
| * PINMUX is decided to verify in FPV only | |
| * **FPV**: | |
| * Verify all the PINMUX outputs by writing assumptions and assertions with a FPV based testbench | |
| * Verify TileLink device protocol compliance with a FPV based testbench | |
| ## Current status | |
| * [Design & verification stage]({{< relref "hw" >}}) | |
| * [HW development stages]({{< relref "doc/project/development_stages" >}}) | |
| * FPV dashboard (link TBD) | |
| ## Design features | |
| For detailed information on PINMUX design features, please see the | |
| [PINMUX design specification]({{< relref ".." >}}). | |
| ## Testbench architecture | |
| PINMUX FPV testbench has been constructed based on the [formal architecture]({{< relref "hw/formal/README.md" >}}). | |
| ### Block diagram | |
|  | |
| #### TLUL assertions | |
| * The `../fpv/tb/pinmux_bind.sv` binds the `tlul_assert` [assertions]({{< relref "hw/ip/tlul/doc/TlulProtocolChecker.md" >}}) with pinmux to ensure TileLink interface protocol compliance | |
| * The `../fpv/tb/pinmux_bind.sv` also binds the `pinmux_csr_assert_fpv` to assert the TileLink writes and reads correctly | |
| #### PINMUX assertions | |
| * The `../fpv/tb/pinmux_bind_fpv.sv` binds module `pinmux_assert_fpv` with the pinmux RTL. | |
| The assertion file ensures pinmux's outputs (`mio_out_o`, `mio_oe_o`, and `mio_to_periph_o`) are verified. | |
| ##### Symbolic variables | |
| Due to there are large number of peripheral and muxed inputs, the symbolic variable is used to reduce the number of repeated assertions code. | |
| In the pinmux_assert_fpv module, we declared two symbolic variables `mio_sel_i` and `periph_sel_i` to represent the index for muxed and peripheral IO. | |
| Detailed explanation is listed in the [Symbolic Variables]({{< relref "hw/formal/README.md#symbolic-variables" >}}) section. | |
| ## Testplan | |
| {{< incGenFromIpDesc "../../data/pinmux_fpv_testplan.hjson" "testplan" >}} |