# SIB header

The SIB header is a 3 rows and 32 pins header that connect the SIB to the MIB.

![SIB header](/_images/hardware/sib-header.jpg){align=center}

## Header pinout

The SIB header pinout is defined as below:

|    | A           | B             | C               |
|----|-------------|---------------|-----------------|
|  1 | GND         | GND           | GND             |
|  2 | +12V_SW     | +12V_SW       | +12V_SW         |
|  3 | GND         | GND           | GND             |
|  4 | +12V_SW     | +12V_SW       | +12V_SW         |
|  5 | GND         | GND           | GND             |
|  6 | +5V_SW      | +5V_SW        | +5V_SW          |
|  7 | GND         | GND           | GND             |
|  8 | +5V_SW      | +5V_SW        | +5V_SW          |
|  9 | GND         | GND           | GND             |
| 10 | +3V3_SW     | +3V3_SW       | +3V3_SW         |
| 11 | GND         | GND           | GND             |
| 12 | +1V8_SW     | +1V8_SW       | +1V8_SW         |
| 13 | +12V        | +3V3          | +1V8            |
| 14 | GND         | GND           | GND             |
| 15 | DUT_OPTO_4C | +5V           | I2C_SIB_3V3_SCL |
| 16 | DUT_OPTO_3C | GND           | I2C_SIB_3V3_SDA |
| 17 | DUT_OPTO_2C | MIB_VIO       | DUT_OPTO_2E     |
| 18 | DUT_OPTO_1C | GND           | DUT_OPTO_1E     |
| 19 | DUT_RST     | DDT_CS        | I2C_MIB_VIO_SCL |
| 20 | DUT_PWR     | DDT_SCK       | I2C_MIB_VIO_SDA |
| 21 | GND         | DDT_MISO      | GND             |
| 22 | DDT_GPIO_9  | DDT_MOSI      | SIB_UART1_CTS   |
| 23 | DDT_GPIO_8  | GND           | SIB_UART1_RTS   |
| 24 | DDT_GPIO_7  | SIB_USB_H2_DM | SIB_UART1_TX    |
| 25 | DDT_GPIO_6  | SIB_USB_H2_DP | SIB_UART1_RX    |
| 26 | GND         | GND           | GND             |
| 27 | DDT_GPIO_5  | SIB_USB_H1_DM | SIB_UART3_TX    |
| 28 | DDT_GPIO_4  | SIB_USB_H1_DP | SIB_UART3_RX    |
| 29 | DDT_GPIO_3  | GND           | GND             |
| 30 | DDT_GPIO_2  | DDT_CAN_L     | SIB_UART4_TX    |
| 31 | DDT_GPIO_1  | DDT_CAN_H     | SIB_UART4_RX    |
| 32 | GND         | GND           | GND             |

:::{admonition} Header orientation
:class: warning
When using hardware design tools, the model for the SIB header is labeled the
over way around!
:::

## Software usage

### Optocouplers

Some optocouplers are available to toggle on and off virtual buttons. The
buttons can be controlled with:

```shell
laacli button 1 on
laacli button 1 off
```

The different buttons are:

* `DUT_OPTO_1C` and `DUT_OPTO_1E`: virtual button `1`
* `DUT_OPTO_2C` and `DUT_OPTO_2E`: virtual button `2`
* `DUT_RST`: `reset` button
* `DUT_PWR`: `power` button

:::{admonition} Unused pins
:class: note
`DUT_OPTO_3C` and `DUT_OPTO_4C` are not used.
:::

### Power rails

The power pins, flagged with `_SW`, are managed power rails that can be
controlled by laacli:

```shell
laacli power 12v on
laacli power 12v off
laacli power 12v reset
```

The header provides 4 power rails: 1v8, 3v3, 5v and 12v.

### Serials

The header provides 3 set of serials:

* `SIB_UART1` as `/dev/ttycmx0`: DUT serial with hardware flow control
* `SIB_UART3` as `/dev/ttycmx2`: LAA serial
* `SIB_UART4` as `/dev/ttycmx3`: DUT serial

`SIB_UART4` is also available via telnet:

```shell
telnet localhost 2000
```

### USBs

The header provide 2 USB ports that are always on at:

* `SIB_USB_H1_DM` and `SIB_USB_H1_DP`
* `SIB_USB_H2_DM` and `SIB_USB_H2_DP`