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HMC833 SPI protocoll

Question asked by Benjamin.Brammer on May 5, 2017
Latest reply on May 8, 2017 by dyoung1

Hi Guys,

since I don't find any comforting answer for my question in the existing forums post, I will ask my question:


The HMC833 SPI protocol is not really clear to me for the following reasons:

  1. On page 41 where the SPI protocoll for HMC Mode is shown there are six address bits a0..a5 but there are only 19 registers, I think. That means you only need five bits for address passing. So for example when I want to address register 0x13 how shall I implement this in the bit stream? like 010011? or shall I ommit zeros?
  2. In the Reg 06h SD CFG Register are the description hints in higher rank than the default values? I.e. : [21]: auto_clcok_config has a default value of 1 but the description says "program 0". Do I always have to follow these kind of descriptionsm, not knowing what they do in the end.


would be glad for some advise. Thanks!


best regards