AUTOPIPELINE_GROUP - 2024.2 English

The AUTOPIPELINE_GROUP property (see AUTOPIPELINE_MODULE, AUTOPIPELINE_INCLUDE, AUTOPIPELINE_LIMIT) is used to define a group of nets as the objects of auto-pipelining optimization. When this optimization feature is triggered, it will insert and place the additional pipeline stages based on setup timing slack and SLR distance. See “Auto-Pipelining” in Vivado Design Suite User Guide: Implementation (UG904) for more information.

Architecture Support

AMD UltraScale™ , AMD UltraScale+™ , AMD Versal™ architectures.

Applicable Objects

• Nets (get_nets)
• Cells (get_cells)

Each single net should be directly driven by a flip-flop, and the fanout load can only be 1.

Value

<group_name>: This is a unique string value that can be assigned to one or more nets. The placer will take the specified objects as one whole group to implement the auto-pipeline insertion. The signals with a same auto-pipeline group name must receive an equal number of auto-inserted pipeline flip-flops.

Syntax

VHDL Example Syntax

attribute autopipeline_group : string; 
signal mywire: std_logic_vector(2 downto 1);
attribute autopipeline_group of mywire: signal is "group_name";

Verilog Example Syntax

(* autopipeline_group="group_name"*)	wire mywire;

XDC Example Syntax

set_property AUTOPIPELINE_GROUP group_name [get_nets mywire]

Affected Steps

• Place Design
• Phys Opt Design