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AFE5832: Problem with reading / writing to DTGC registers

Part Number: AFE5832

1) I have problem with writing and reading DTGCe, DTGCo registers for AFE5832, but I can read and write to all other registers (ADC, VCAe, VCAo)

I try to set TGC_WR_EN = 1 (global register 0b10000), next write to DTGCe, DTGCo registers.
Next I set DTGC_WR_EN = 0, REG_READ_ EN = 1, (global register 0b10), after it, I read ADC register as FFFF, and read some wrong values from VCAo and VCAe.

Please help how to read and write to DTGC registers?

2) If set ADC register 2 = b0100 0001 0000 0000 , PAT_MODES_FCLK[2:0] = 010 deskew and PAT_MODES[2:0] = 010 deskew, I can read 010101 pattern from LVDS lines, but not from fclk. Please help how to test fclk?

Best Regards, Vassili