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== Programming Modes ==
The Xilinx Spartan-3A FPGA we will be using on the SiPM control board can be programmed using any of several modes. This table, adapted from the [http://www.xilinx.com/support/documentation/user_guides/ug332.pdf User Guide], Table 2-1, shows the available programming modes and how to select them by setting the M[2:0] pins on the FPGA.
The Xilinx Spartan-3A FPGA we will be using on the SiPM control board can be programmed using any of several modes. This table, adapted from the [http://www.xilinx.com/support/documentation/user_guides/ug332.pdf User Guide], Table 2-1, shows the available programming modes and how to select them by setting the M[2:0] pins on the FPGA.
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=== SPI mode ===
When programmed in SPI mode, the variant select pin