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NYao
Partner
140 Views

Quartus中的路径约束

Hi,

我需要在Qartus 18.1中做3个信号的路径约束。将三个寄存器的输出连到3个相邻的管脚上,要求3个信号的延时相同,最好走的路径也相近,请问怎么约束?​

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7 Replies
37 Views

Hi,

 

You may use the set_max_skew constraint to perform maximum allowable skew analysis between sets of registers or ports.

 

If you want to set the maximum allowable delay, you may use set_max_delay to specifies a maximum delay exception for a given path.

 

Thanks.

Best regards,

KhaiY

 

 

NYao
Partner
37 Views

hi,

除了约束skew,怎样固定布线路径?​

37 Views

Hi,

 

You may set a region for placement and routing but not a specific routing path. To lock the region, you may use logic lock.

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug-qpp-design-optimizati... Chapter 6.5.1. Creating Logic Lock Assignments with Tcl commands

 

Thanks.

NYao
Partner
37 Views

你好,

我能够把我的输出寄存器给约束位置吗?​

NYao
Partner
37 Views

使用什么语法约束?有没有例子?​

37 Views

Hi,

 

You can create the Logic Lock region using the GUI or qsf assignment.

 

For example,

1) use the assignment below to create a new placement region with bounding box

coordinates X46 Y36 X65 Y49:

 

set_instance_assignment -name PLACE_REGION "X46 Y36 X65 Y49" -to <node names> 

 

2) use the assignment below to create a routing region with bounding box coordinates X46 Y36 X65 Y49: set_instance_assignment -name ROUTE_REGION -to "X46 Y36 X65 Y49"

 

Please note that all instances with a routing region assignment must have a respective placement region; the routing region must fully contain the placement region.

 

Thanks.

Best regards,

KhaiY

37 Views

Hi,

 

Do you have any updates?

 

Thanks.

Best regards,

KhaiY

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