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AR# 52333

Why does Vivado Synthesis generate "ERROR: [Synth 8-2914] Unsupported RAM template" when more than two clocks are present within a block RAM memory inferring HDL code?

Description

If a block RAM memory generator HDL code has more than two clocks, the Vivado Synthesis tool generates the following error:

ERROR: [Synth 8-2914] Unsupported RAM template

Solution

As an example, where a block RAM memory sub-module HDL code has four clocks; wr0_clk, rd0_clk, wr1_clk and rd1_clk, and the top level module that instantiates this sub-module maps these four clocks to the same clock or two different clocks. The Vivado Synthesis tool will generate the above mentioned error because it considers the actual block RAM memory sub-module that contained the four clocks as having violated the actual Xilinx block RAM primitive supported ports.

The Xilinx block RAM primitive does not support four clocks, and as a result, the Vivado synthesis tool generates the unsupported RAM template error message.

To avoid this problem, a recommended option would be to write block RAM HDL code that adheres to Xilinx block RAM primitive supported ports.

AR# 52333
Date Created 10/12/2012
Last Updated 12/11/2013
Status Active
Type Known Issues
Tools
  • Vivado Design Suite