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Subject: location of the level shifter in CPF
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khaled
Posts: 1
Online: User is Offline
4/16/2007 7:23 PM  
Hi, In CPF, there are two ways to define the location of the level shifters: 1. when defining the level shifter: define_level_shifter_cell -cells cell_list [-valid_location { from | to} 2. when updating the level shifter rule: update_level_shifter_rules -names rule_list -location {from | to} I have two questions: 1. which command option takes precedence over the other if both options have different values? 2. what is the reason behind having this option in both commands in the CPF specification? don't you think that the location option in 'update_level_shifter_rules' is enough to describe the user's intent? Thanks, Khaled
qwang
Posts: 1
Online: User is Offline
5/07/2007 1:19 PM  
-valid_location is the preferred cell location based on the cell design. -location in update_*_rule command is to give user the flexibility to overwrite the -valid_location from cell definition. If both are set, -location takes the precedence. In most cases, -valid_location should be used and
-location in update_*_rules should only be used in special cases. Hope it clarifies. Thanks
Qi
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Forums > Special Topics > Low power > location of the level shifter in CPF


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