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In order to consider the different pin length of stackable und normal pin headers the following procedure is recommended for installing stackable pin headers in combination with normal ones on the Spartan 6 USB-FPGA Modules 1.11.

At variants with pre-installed female pin headers the user circuit is stacked between the FPGA board and the Power Supply Module. In this case the following description refers to the user circuit.

Step 1: Plug in the 1x16 pin headers, but don't solder it

Step 2: Lay the the board on a flat surface and plug in the stackable pin headers such that the pins have the same height (Don't forget to apply solder flux e.g. from a flux dispenser pen) Solder the corner pins of the stackable pin headers

Step 3: Remove the 1x16 pin headers Solder the rest of the pins of the stackable pin headers. The pins can be soldered on any side (whatever is more comfortable)

Step 4: Plug in and solder the 1x16 pin headers