An array parameter can also work similarly as scalar RTP. However, you must update the array as a whole (not partial of the array).
The test case is async_array_rtp.
The kernel signature is:
template<int32 NUM>
void vect_add(input_buffer<int32,extents<NUM>>& __restrict in,output_buffer<int32,extents<NUM>>& __restrict out,const int32 (&value)[NUM]);
You can find the RTP specification in aie/graph.h:
using namespace adf;
adf::port<adf::direction::in> value;
adf::connect<adf::parameter>(value, async(k.in[1]));
You can find the RTP calls for aiesimulator in aie/graph.cpp:
int value[256];
gr.run(4);
gr.update(gr.value,value,256);
You can find the host code for HW and HW emulation flows in sw/host.cpp:
int value[256];
auto ghdl=xrt::graph(device,uuid,"gr");
const int ITERATION=4;
ghdl.run(ITERATION);
ghdl.update("gr.k.in[1]",value);