Run Time Parameter (RTP) for Vector Lengths - Run Time Parameter (RTP) for Vector Lengths - 2026.1 English

The conv_corr_graph class supports runtime-configurable vector lengths via the TP_USE_RTP_VECTOR_LENGTHS template parameter:

• TP_USE_RTP_VECTOR_LENGTHS = 0 (default): Static vector lengths. Both TP_F_LEN and TP_G_LEN are fixed at compile time through class template parameters, and no RTP port is present.
• TP_USE_RTP_VECTOR_LENGTHS = 1: Runtime-configurable vector lengths. An asynchronous input port rtpVecLen is added to the graph. The single RTP port carries both F and G vector lengths as a 2-element int32 array: inVecLen[0] = runtime F_LEN, inVecLen[1] = runtime G_LEN.

Constraints for TP_USE_RTP_VECTOR_LENGTHS = 1:

• IO-Buffer only: Not supported on the Stream interface (TP_API = 1).
• Availability: At least one of TP_F_LEN or TP_G_LEN must be strictly greater than its compile-time minimum. When both are at their minimum values, TP_USE_RTP_VECTOR_LENGTHS = 1 is not available.

The following constraints must be satisfied for valid RTP operation:

S.No	Constraint	Description
1	RTP_F_LEN ≤ TP_F_LEN	Runtime length cannot exceed the compile-time maximum for F.
2	RTP_G_LEN ≤ TP_G_LEN	Runtime length cannot exceed the compile-time maximum for G.
3	RTP_F_LEN ≥ RTP_G_LEN	Base requirement for all compute modes.
4	RTP_F_LEN % base_load = 0	Must be an integer multiple of the vector size for TT_DATA_F (data-type dependent).
5	RTP_G_LEN % base_load = 0	Must be an integer multiple of the vector size for TT_DATA_G (data-type dependent).

• VALID mode output port sizing: When TP_COMPUTE_MODE = VALID and TP_USE_RTP_VECTOR_LENGTHS = 1, the output port is sized for the worst-case (largest) output, which corresponds to the smallest possible G_LEN (i.e., the compile-time minimum G_LEN). This ensures the output buffer is always large enough regardless of the runtime G_LEN passed via RTP.