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Forums > Digital IC > Synthesis and test

Subject: remove_assigns
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sporadic crash
Posts: 43
Online: User is Offline
7/11/2007 12:09 PM  
v07.10-p004_1 says to me that remove_assigns command will be obsolete in the future, because Encounter will be able to process assign statements in the netlist. However we use 3rd party backend tools which need a netlist without any assign statement.

I have following code in RTL:

assign y = x;

but the netlist still has it that:

assign y = x;

I have tried several combinations for remove_assigns but not successes. This command does not clean assigns completely.

Also, the removed assign statements are replaced with following instance names:

  bfx2 rm_assigns_buf_out_0_0(.A (in_1Ύ]), .Z (out_0Ύ]));

Is there any attribute in Cadence how to control the instance names like this?
Thanks...
Stalker
Posts: 24
Online: User is Offline
8/30/2007 12:23 AM  
Hi,
Often RC can't remove assign because of "preserve" attribute
Try somthing like this:

# Reset existing preserve attributes (set preserve attribute to false)
set save_ui_respects_preserve [get_attribute ui_respects_preserve /]
set_attribute ui_respects_preserve false /
remove_assigns
# Restore setting
set_attribute ui_respects_preserve $save_ui_respects_preserve /
Maxim R.
sporadic crash
Posts: 43
Online: User is Offline
9/05/2007 12:45 PM  
Hi Stalker,

extremely sorry for late answer. I was busy with some other stuff.

I was asked by Cadence FAE to use /etc/synth/rc/remove_assigns.tcl which "emulates" the obsolete command for 7.x releases, because 7.x does not support it any more.

Having used this command in the script, I have seen that all buffers inferred have the [b]preserve[/b] attribute of "size_ok". Their inherited_preserve also. All the parent modules are either top-level or in the form of csa_tree_addxxx in instance name. CSA ones are I think synthetic operators. However these parent modules do not have preserved attribute of "size_ok", instead, "false".

Just because of the reason I could not rename the buffer instance names. I wonder why RTL Compiler puts inferred buffers to remove assigns into preserve of "size_ok"?
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Forums > Digital IC > Synthesis and test > remove_assigns


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