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AR# 15068

7.1i XST - Inferring block RAM

Description

General Description:

XST does not properly infer block RAM under the following conditions:

- When a 512x16 block RAM described as a RAMB16_S36 is inferred instead of RAMB18_S18.

- When the output port width is greater than the RAM word width.

Solution

For more information on inferring RAM, see the Xilinx Synthesis Technology (XST) User Guide in the software manuals, available at:

http://www.xilinx.com/support/software_manuals.htm

The ISE Language Templates also have examples on how to infer RAM

AR# 15068
Date Created 09/03/2007
Last Updated 12/15/2012
Status Active
Type General Article