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custom board, ad9177 init failed at pre clock init stage.

Category: Software
Product Number: AD9177
Software Version: ad9177_dac_only_mxfe_variant-rel1.4.1

On our custom board, ad9177 spi read chip id ok, check reg w/r ok. but init faild at pre clock init stage.

Ad9177 use a 12ghz external clock  as main clock, sysref not connected, no hmc7044. 

After print 100 times [ad9177:r@b742 = 33], print error log below.

Pre Clock Boot Sequence Error

Please check power suppliers (no open, no short, no big glitches)

Ensure Clocks are available

ad9177:r@b740 = 02

ad9177:r@b741 = 60

ad9177:r@b742 = 33

ad9177:r@b743 = 00

There is no description about reg b740~b743.

How to debug this problem? any suggestion?