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ADS54Jxx setups

John Reyland62
Intellectual 375 points
Other Parts Discussed in Thread: ADS54J60, ADS54J42

Sequence of setup writes. Below is from the LMF_8224.cgf file: 

Does the statement "0x690000 0x81 // set CTRL K " directly write to 0x690000 regardless of the setting of general register 4 (data sheet page 43)? If so, why do we need general register 4 ? Is "ADS54Jxx_DIGITAL" a command to the config downloader? If so, why don't we have "ADSjxx_JESD_Digital" for the 0x690000 writes? 

Thanks , John Reyland

LMK04828
0x10F 0x66 //Enable SYSREF to ADC
ADS54Jxx_ANALOG
0x0000 0x81 // LMF = 8224
0x0011 0x80
0x0059 0x20 // always write 1 to bit 5
ADS54Jxx_DIGITAL
0x6800f7 0x01 // digital reset
0x680000 0x01 // reset digital
0x680000 0x00 // clear reset this pulse must be the last write to main digital 0x680000
0x690000 0x81 // set CTRL K
0x690001 0x01 // JESD Mode (bits 2-0),20X mode, 4 lanes per ADC 
0x690006 0x13 // set K to 20
LMK04828
0x10F 0x06 //Disable SYSREF to ADC

  • 0
    Intellectual 375 points
    Hi Jim, Thanks for explaining about the command ADSjxx_JESD_Digital, I understand.

    However, why is there no memory config command here when we go from address 0x68000 to 0x69000?

    ADS54Jxx_DIGITAL
    0x6800f7 0x01 // digital reset
    0x680000 0x01 // reset digital
    0x680000 0x00 // clear reset this pulse must be the last write to main digital 0x680000
    0x690000 0x81 // set CTRL K
    0x690001 0x01 // JESD Mode (bits 2-0),20X mode, 4 lanes per ADC
    0x690006 0x13 // set K to 20

    Thanks,
    John Reyland
  • 0 in reply to John Reyland62
    TI__Guru* 91947 points

    John,

    These are two registers within the same page. You can write to all of the registers within the page once the page has been selected.

    Regards,

    Jim

  • 0 in reply to jim s
    Intellectual 280 points
    Hi Jim,

    OK, you say 0x680000 and 0x690000 are two registers within the same page on the ADS54J60. However when I look at bottom of page 43, Table 21, register 4h, on the ADS54J60 data sheet seems like there are three page selections. Please explain, if 0x680000 and 0x690000 and also 0x6A0000 are all on the same page then why do we need register 4h?


    Thanks,

    John Reyland
  • 0 in reply to Jon Reyland
    TI__Guru* 91947 points

    John,

    We are getting to release an updated version of this data sheet which will correct for issues with the register map. Please take a look at the register map of the ADS54J42 (attached) as this is the most updated document and the ADS54J60 will be updated to this. Actually  these are three different pages, as shown in this updated data sheet. I think I was wrong on what I sent you yesterday. Hope this helps.

    Regards,

    Jim

    8308.ads54j42.pdf

  • 0 in reply to jim s
    Intellectual 280 points
    Hi Jim,

    You are right, the ADS54J42 data sheet is clearer. A list of the ADS54J60 configuration file commands and how they function, for example "ADS54Jxx_DIGITAL" would really help me (and maybe keep me from bugging you so much!)

    Thanks,

    John Reyland