AxelEVB-Lite-Adapter (AxelLite)

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Applies to Axel Lite


	THIS PAGE IS OBSOLETE, DON'T USE IT AS REFERENCE
The new documentation is available here: AXEL_Lite_SOM/AXEL_Lite_Evaluation_Kit

Introduction[edit | edit source]

Axel Lite requires a dedicated adapter to be plugged to the AxelEVB-Lite carrier board. This adapter:

provides the SODIMM socket for the AxelLite SOM
provides the following additional features:
- microSD slot (for SD boot)
- JTAG connector
- dip-switch for boot mode selection
routes the signals from the AxelLite pins to the AxelEVB-Lite mating connectors

There are two versions of the adapter. Revision 0 is used in combination with the AxelEVB-Lite revision 0. Revision A is used in combination with the AxelEVB-Lite revision A.

Revision 0[edit | edit source]

The following images show the top and bottom views of the AxelEVB-Lite-Adapter revision 0:

Top view

Bottom view

Revision A[edit | edit source]

The following images show the top and bottom views of the AxelEVB-Lite-Adapter revision A:

Top view

Bottom view

Connectors' pinout[edit | edit source]

J6 - SODIMM connector[edit | edit source]

J6 is a TE Connectivity 204-pin SODIMM socket. The pinout matches the Axel Lite pinout.

J1, J2, J3 - AxelEVB-Lite mating connectors[edit | edit source]

J1, J2 and J3 are Hirose FX8C-140S-SV connectors that match the AxelEVB-Lite SOM connectors' pinout.

J4 - JTAG[edit | edit source]

J4 is a SAMTEC FSI-110-03-G-S connector. The following table reports the connector's pinout:

Pin#	Pin name	Function	Notes
1	DGND	-	-
2	JTAG_TCK	-	-
3	JTAG_TMS	-	-
4	JTAG_TDO	-	-
5	JTAG_TDI	-	-
6	JTAG_nTRST	-	-
7	CPU_PORn	-	-
8	N.C.	-	-
9	N.C.	-	-
10	JTAG_VREF	-	-

Boot mode selection[edit | edit source]

The following sections detail how to select the boot option depending on the adapter's revision.

For further details, please refer to this page, which describes the available boot modes thoroughly.

Revision 0[edit | edit source]

This adapter provides a switch that allows selecting the boot device according to the following table. The available boot options differ depending on the Axel Lite type. In this regard, there are basically two types: those that are equipped with both NOR and NAND flash, and those that are equipped with NAND flash only.


Axel Lite type	S1.2 position
Axel Lite type	on	off
NOR and NAND flash	microSD card	NOR flash
NAND flash only	microSD card	NAND flash

It is worth remembering that, when using Axel Lite in combination with AxelEVB-Lite revision 0, the S5, S6, S7, S8, and S9 switches of the carrier board don't affect the boot options.

Revision A[edit | edit source]

Revision A does not integrate any switch. To select the boot source, please use the S9.2 switch provided by the AxelEVB-Lite rev. A board instead.

The selectable boot options differ depending on the Axel Lite type. In this regard, there are basically two types: those that are equipped with both NOR and NAND flash, and those that are equipped with NAND flash only.