Jim, I'm trying to update my configuration to LMF=222 per your suggestion, but there are some things I don't understand. M is defined as the "number of converters per device." In this context, what is a converter -- an input IQ value, an output DAC, a path pair (AB and CD), or something else? I thought I understood the "SERDES lane" vs "JESD link" distinction, and, most of the time, lane is used for the SERDES and link is used for the JESD (as done in the spec), but there are some places where "JESD lane" is used, ("SERDES link" is never used). Is there a difference between "JESD link" and "JESD lane" and which is more appropriate? That is, are there ever multiple JESD links, or just multiple JESD lanes in the single JESD link? In table 9 (JESD204B Frame Assembly Byte Representation), what do the "0" and "1" mean in "I0[15..8]" and "I1[15..8]," respectively? Are these converter numbers or sequence indexes (or something else)? Is table 9 per link? If so, what does the middle 2 in LMF=222 mean? I thought I understood the "SERDES lane" vs "JESD link" distinction, and, most of the time, lane is used for the SERDES and link is used for the JESD (as done in the spec), but there are some places where "JESD lane" is used, ("SERDES link" is never used). Is there a difference between "JESD link" and "JESD lane?" I have config77 (0x4d) = 0x0100, which I believe means 2 converters per link and 1 sample per frame. Is the 2 converters per link the middle 2 in LMF=222? If so, I already had it set up for LMF=222. If not, what is the config setting that controls this? To set it up as you describe, will I have to use two links -- one for each path pair (AB and CD), and assign the same SERDES lanes used for JESD link 0 to JESD link 1? Or could I use one JESD link and just reuse JESD sample 0 on all paths (A..D)? As I had said before, I only actually have on lane connected, which in LMF=2x2 mode, carries only the I data. I am assigning SERDES lane 0 to both JESD lane 0 and 1 (config95,96=0x0023,0x4567), which, I believe, ends up giving the same values for I and Q. I am assigning input paths A and B to both to JESD sample 0, and output path A to DAC A (config34=0x0b1b). The pathN_in_sel fields in config34 are all in terms of sample number from JESD, with no reference to lane/link. In LMF=222, the the sample number (which is what I am now taking the "0" and "1" to represent) are only 0 and 1. I don't see where the JESD link index comes into it. If multiple JESD links are used, how would I specify the link? Would it be implicit in using samples 2 and 3? With the new programming, would I do the following?: * Assign SERDES lane 0 to JESD lanes 0..3 (config95=0x0000), *Assign input paths A and B to sample 0, and path C and D to JESD sample 2, * Assign output path A through D to DACs A through D, respectively (config34=0x001b). Or would I use my earlier suggestion of using a single JESD link and perform the "data replication" to path CD using config34. In fact, given that I won't be using path CD outputs anywhere, is it even necessary? Thanks, Lance
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