Technical data

Diagnostic interface 27/72

netRAPID Chip Carrier | Design Guide

5 Diagnostic interface

The diagnostic interface can be used for

 configuration download,

 diagnostic purposes and

 firmware update (firmware update at netRAPID NRP 10 only)

It is mandatory to add a diagnostic interface to the host system.

This interface is needed during the production process to load the Second Stage Boot Loader and

firmware into the netRAPID device.

5.1 USB interface

The USB interface is needed during production to load the Second Stage Boot Loader and the

firmware into the netRAPID device. The USB interface is handled by the ROM loader in this case.

Once the Second Stage Boot Loader is running, the Second Stage Boot Loader handles the USB

interface.

Once the firmware is running, the firmware handles the USB interface.

Note: The standard firmware activates the USB interface by default.

The following pins of the netRAPID relate to the Universal Serial Bus (USB) interface.

Pin Name

44 USB-

45 USB+

Table 9: Pin assignment of USB interface

The USB signals have LVTTL level (3.3 V).

Note: USB is used for diagnostic and for production purposes.

Note: The external USB power supply line is not used by the netRAPID.

The USB signals have to be protected with 22  and transient diode. The circuit for the host

system is shown in chapter Schematics which is on page 62 (NRPEB-CCS and NRPEB-DPS) or

page 64 (NRPEB-RE2).