AR# 55764

Vivado - 2013.x Vivado Synthesis -- RAM_STYLE attribute specified as Capital letters not working

When the RAM_STYLE attribute is specified in capital letters in RTL, Vivado Synthesis still infers a distributed RAM.

This issue was noted in -1 speed grade devices.

Both RAM_STYLE=BLOCK and ram_style=block work with -2 speed grade devices.

However setting RAM_STYLE=BLOCK does not infer a block RAM in -1 speed grade devices, but instead infers a distributed RAM.

Setting the ram style to block in lower case letters (ram_style = block) does infer a block RAM for -1 speed grade devices.

The issue is fixed in the 2013.2 release.

For prior versions, the workaround is to always specify the attribute in lower case (ram_style = block).

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Answer Number	Answer Title	Version Found	Version Resolved
55334	2013.x Vivado Synthesis - Known Issues	N/A	N/A

AR# 55764
Date	10/20/2014
Status	Active
Type	Known Issues
Devices	Artix-7 Artix-7Q Kintex-7 More Kintex-7Q Virtex-7 Virtex-7Q Less
Tools	Vivado Design Suite - 2013.1 Vivado Design Suite - 2012.4 Vivado Design Suite - 2012.3 More Vivado Design Suite - 2012.2 Vivado Design Suite - 2012.1 Less

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