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AD6655 test pattern

Hi

One question about the test pattern of AD6655.

We used to test pattern of AD6655 to verify our design in FPGA.

SPI addr = 0x0D, SPI data = 000b : Normal operation output pattern confirmed

SPI addr = 0x0D, SPI data = 011b : -FS output pattern confirmed

SPI addr = 0x0D, SPI data = 001b : output is not midscale short pattern. output is the same as -FS (all 0)

SPI addr = 0x0D, SPI data = 010b : output is not +FS. output is the same as -FS (all 0)

In above envirment, other register setting is all same. Only 0x0D register is different.

I do not know what we did wrong.