Data Frames#

Data transmission from the read channel and from the write channel is packed in frames. Each frame is a timestamped type-length-value-encoded structure that contains data corresponding to a single device sample. The frame format is:

uint32  dev_addr
uint64  acqclk_cnt
uint32  sample_sz
var     sample

where

  • dev_addr: Device Address. The address of the device producing the data, as featured on the device table.

  • acqclk_cnt: Acquisition counter. A counter common to all devices generated by the controller common acquisition clock. On write frames, this field is ignored.

  • sample_sz: Sample Size. The full size of the sample, and must be equal to the rd_samp_size field of the device descriptor on read frames or a multiple of the wr_samp_size on write frames.

  • sample: The complete data sample as described on the device sample format section.

    While a read frame must always contain a single sample as generated by the devices, write frames can contain multiple samples targeted to the same device.