AR# 33375

MIG v3.2, Virtex-6 FPGA RLDRAMII - Valid configurations to avoid tRC violations for -18, -25, -25E, and -33 devices

Description

The MIG v3.2 Virtex-6 RLDRAMII design has tRC violations for specific configurations. These are actual tRC violations that cannot be ignored. This answer record details valid configurations/frequency ranges that do not generate tRC violations.

Solution

-25 Devices (up to 400 MHz) 

Frequency = 175-200 MHz Valid Configurations = 1, 2, 3 
Frequency = 201-299 MHz Valid Configurations = 2, 3 
Frequency = 300-400 MHz Valid Configurations = 3  

-33 Devices (up to 300 MHz)  

Frequency = 175-200 MHz Valid Configurations = 1, 2, 3 
Frequency = 201-299 MHz Valid Configurations = 2, 3 

-25E and -18 Devices (Full Frequency Support) 

Frequency = 175-266 MHz Valid Configurations = 1, 2, 3 
Frequency = 267-400 MHz Valid Configurations = 2, 3 
Frequency = 400-533 MHz Valid Configurations = 2, 3 

All 576 Mb, -25 Devices  

Because of the tRC violations on all of these devices, support is not available in MIG v3.2. To start in a design, select a comparable RLDRAMII device until support is added in MIG v3.3. 

All of these issues will be resolved in MIG 3.3 which will be released with ISE Design Suite 11.4.
AR# 33375
Date 05/23/2014
Status Archive
Type General Article
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