Yes. Take a look at the gain OOT RFNoC block example:
https://github.com/EttusResearch/uhddev/blob/master/host/examples/rfnoc-example/fpga/rfnoc_block_gain/rfnoc_block_gain_tb.sv

For example, here it generates test input data:
https://github.com/EttusResearch/uhddev/blob/1be0f33bf32fd319facc654cb515449d968ea05f/host/examples/rfnoc-example/fpga/rfnoc_block_gain/rfnoc_block_gain_tb.sv#L258

This is then sent using send_items() and the block's output is received
using recv_items().

Most of the RFNoC blocks have examples of doing something like this.

Wade

On Wed, Oct 26, 2022 at 9:41 PM Xingjian Chen <xingj...@umass.edu> wrote:

> Hi there,
> I am creating an OOT RFNoC block that does pulse average for X310. In a
> simulation, can you generate and manipulate input payload stream data?
> Could anyone point a direction about which file can feed the RFNoC
> simulation a customized waveform? Thank you.
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