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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.

Actions

AR# 33375
Date Created 09/09/2009
Last Updated 06/09/2011
Status Active
Type
Devices
  • Virtex-6 CXT
  • Virtex-6 HXT
  • Virtex-6 LX
  • More
  • Virtex-6 LXT
  • Virtex-6 SXT
  • Less
IP
  • MIG
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