TX: I and Q in one signal [referring to rx_path[inst35])

Projects LimeSDR
1

Hello everyone,

I was wondering what is happening to the 12 bit databus (LMS_DIQ2_D[11…0]) after it goes into the “rx_path” module (inst35) on the FPGA, especially considering the change of the bus width from the 12 bit input vector to the 64 bit output vector (rx_pct_data[63…0]).

I’ve been experimenting with FPGAs for a while now and I tried to understand the mechanics of this module on my own but ooh wee, this is quite a bit for an amateur to chew on. :sweat:

Since the data is coming in with I and Q seperated I assume the output vector rx_pct_data[63…0] of “rx_path” is in some form both parts together? Is there some form of documentation of what exactly this vector is made of?

E.g.

  • 63…52 --> data_I
  • 51…40 --> data_Q
  • 39…XX --> other data
    … or in some similar way?

I would really like to know if there is a signal that already includes I and Q part in one vector-signal?

I am very grateful for any kind of help! :slight_smile:

Best regards,
Sulfur