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  3. AR# 35485: MIG Spartan-6 DDR2 - When I use Synplify Pro for synthesis the design fails to send data in hardware

AR# 35485

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MIG Spartan-6 DDR2 - When I use Synplify Pro for synthesis the design fails to send data in hardware

描述

When I use Synplify as my synthesis tool, attributes are not passed to the implementation tools correctly which causes the controller to be inactive in hardware, and it does not send commands as requested at the ports.

解决方案

This is due to a known issue in the Synplify Pro flow and is scheduled to be resolved in 12.2.

You can work around this issue by overriding these attribute settings in the constraints file as follows.

For example, add the following to the".ucf" constraints file:

INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_0 = 18'o012345;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_1 = 18'o123450;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_2 = 18'o234501;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_3 = 18'o345012;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_4 = 18'o450123;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_5 = 18'o501234;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_6 = 18'o012345;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_7 = 18'o123450;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_8 = 18'o234501;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_9 = 18'o345012;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_10 =18'o450123;
INST "memc3_wrapper_inst/memc3_mcb_raw_wrapper_inst/samc_0" ARB_TIME_SLOT_11 =18'o501234;

Note that the instance name vary depending on the MCB instance being used in your design and the attribute value vary depending on your arbitration sequence specified. To see the value specified in your code, look in example_top.v and identify the appropriate controller parameters.

For example, controller 3 time slot 0 will be:
localparam C3_ARB_TIME_SLOT_0 = 18'oxxxxxx;

链接问答记录

主要问答记录

Answer Number 问答标题 问题版本 已解决问题的版本
34587 MIG v3.4 - Release Notes and Known Issues for ISE Design Suite 12.1 N/A N/A

相关答复记录

Answer Number 问答标题 问题版本 已解决问题的版本
34587 MIG v3.4 - Release Notes and Known Issues for ISE Design Suite 12.1 N/A N/A
AR# 35485
日期 12/15/2012
状态 Active
Type 综合文章
器件
IP
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