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AR# 41145

12.4/13.4/14.7 MAP - BRAM utilization summary in the MAP report

Description

Slice Logic Utilization Used Available Utilization
Number of RAMB36E1/FIFO36E1s 206 264 78%
Number using RAMB36E1 only 206
Number using FIFO36E1 only 0
Number of RAMB18E1/FIFO18E1s 105 528 19%
Number using RAMB18E1 only 105
Number using FIFO18E1 only

 

What is the total BRAM utilization for this design?

Solution


There are not 264 RAMB36E1 and 528 RAMB18E1 on this particular Virtex-6 device as reported.

These 2 figures represent the total number of BRAM split into either 36K or 18K components.


As a results the total BRAM utilization is a combination of both of the above figures.

 

There are 206 RAMB36E1 used and 105 RAMB18E1 used.

A RAMB18E1 is half of a RAMB36E1 component, therefore 105 RAMB18E1 is the equivalent of 53 RAMB36E1 components. (105/2 + 1 for the extra)

 

As a results, total BRAM utilization is 206 + 53 = 259 or 98%

Adding the two values together will give a similar outcome of 97%. (This figure omits the extra 1 RAMB18E1)

 

 


AR# 41145
Date Created 03/09/2011
Last Updated 10/01/2014
Status Active
Type General Article
Tools
  • ISE Design Suite - 12.4
  • ISE Design Suite - 13
  • ISE Design Suite - 14