# CW308T-MPC5748G¶

The MPC5748G target uses the NXP MPC5748G device, which is a triple-core PowerPC microcontroller for automotive applications. This target board has a number of interesting features including:

• Two CAN/CAN-FD interfaces, with with DB9.
• Two serial ports (usable as LIN).
• Various solder jumpers for variety of power analysis options.

Attention

This target requires an external programmer for the MPC5748G to reload code.

Attention

This target is not integrated into the ChipWhisperer "HAL" build system due to the multi-core support.

## Specifications¶

Feature Notes/Range
Target Device MPC5748G
Target Architecture Triple Core PowerPC
Vcc 1.3V
Programming JTAG
Hardware Crypto Possible
Availability Standalone
Status Released
Shunt

## Quick Start¶

### Hardware¶

To use this target, you should:

• Plug the target into a CW308 base-board.
• Ensure the CW308 has a 5V power supply - either by connecting to a ChipWhisperer-Pro, or using a 5V source on the 2.1mm DC power jack.

### Software¶

This Target requires special setup. An example script can be found at: https://github.com/newaetech/chipwhisperer-jupyter/blob/1ccd1b1fbd8a3295e1033efb37e53e1022d47cc5/Helper_Scripts/Setup_CW308_MPC5748G.ipynb

The demo application (see below) allows you to run various of the normal ChipWhisperer demos, along with other work.

## Demo Application¶

The demo application provides examples of:

• Using serial interface (implements Simple-Serial).
• Using CAN interface.
• Enabling all three cores, and communicating between cores with shared memory.
• Running software AES on main core.
• Running password-check (XOR) on main core.
• Setup of clock network for using external clock from ChipWhisperer.
• Enabling the PASS module & passing a password to it (to allow DPA testing of PASS module).

This demo application is posted as a separate github repository at https://github.com/newaetech/chipwhisperer-target-mpc5748g. The github link includes additional documentation.

## Offered Variants¶

The product is available in one variant:

• The "NORMAL" variant which is normally shipped (i.e., P/N NAE-CW308T-MPC5748G). This variant has the following setup:

• HSM is not programmed. We cannot provide details on this usage without a NDA.

• The four OTP password groups have been programmed with 4 known passwords you can use for experimentation.

• Device lifecycle is progressed to the "OEM Production" stage. This will prevent you from doing certain updates to the memory, but for most "normal" uses will not prevent reloading of code etc. This progression is done since it is required to use the password/censorship features.
• The demo application is loaded which includes ability to execute code loaded over the serial port and change/read memory locations (but is NOT a full bootloader).
• Device censorship is disabled (this can be turned on using an external programmer).
• The JTAG port has a known password, but is not locked (this can be turned on using an external programmer or via load functions).

## Programming¶

The device is designed to use an external programmer for reflashing, as it does not include a bootloader. The suggested programmer (scripts are provided in the GIT repo) is the PE-Micro which requires purchasing:

• PEMicro PROGPPCNEXUS (Programmer SW only) or PEMicro PowerPC Nexus Development Kit (includes Debugger). You may be able to use a GDB server instead but we haven't tested this.

You can use the MPC5748G-DEVKIT instead with invasive hardware mods - the devkit has an on-board programmer, but it uses buffers such it cannot be routed to any available header pins. You would need to solder small jumper wires to small SMD pins for this to work. However as the dev-kit is very cheap, it may be worthwhile to scrap one and convert into an external programmer.

## HSM Usage¶

The device features a HSM, but details of this are under NDA and cannot be made public.

## Random Useful Tips¶

### S32DS Version¶

It is recommended to use S32DS Version 2017 or later. The default linker scripts changed slightly in such a way that old scripts don't work with the new version, and thus all scripts have been updated to work with the latest release.

### Disassembling Source¶

If you are having trouble debugging, it can be useful to read out a memory segment and dissassemble it. This is possible with the included S32DS tools. The following shows the required command line:

E:\nxp\S32DS_Power_v2017.R1\Cross_Tools\powerpc-eabivle-4_9\bin>powerpc-eabivle-objdump.exe -mpowerpc -Me200z4 -D -b srec -EB MPC5748G.s19 > MPC5748G.txt