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In RTL-Compiler, I used "report power" command after synthesis, and got following report. Could someone please tell me what activity factor and clock frequency are considered by RC to generate that report?
my target clock period was 500ps and timing analysis shows a negetive slack time of -450ps.
============================================================ Generated by: Encounter(r) RTL Compiler v06.20-s027_1 Generated on: Nov 21 2008 01:45:55 PM Module: decoder648 Technology libraries: IO90GPHVT_2V5_3V3_50A_7M2T IO90GPHVT_2V5_50A_7M2T IO90GPHVT_3V3_50A_7M2T IO90GPHVT_ANA_50A_7M2T IO90GPHVT_BASIC_50A_7M2T IO90GPHVT_FILLERCUT_50A_7M2T IO90GPHVT_REF_COMPENSATION_2V5_50A IO90GPHVT_REF_COMPENSATION_3V3_50A PR90M7 CORE90GPSVT CORX90GPSVT CLOCK90GPSVT Operating conditions: wc_0.90V_125C (balanced_tree) Wireload mode: top============================================================ Leakage Internal Net Switching Instance Cells Power(nW) Power(nW) Power(nW) Power(nW) ------------------------------------------------------------------------------------decoder648 480027 567216066.450 1140456537.747 407240261.752 1547696799.500
I believe this is some of the information you are looking for
rc:/> get_attr -h lp*default* * Usage: get_attribute <string> [<object>+] <string>: attribute name [<object>+]: object of interest (must be unique) attribute categories: lp_tcf tim attribute name: lp_default_toggle_percentage category: tim (controls timing optimization and returns timing information) object type: clock access type: read-write data type: fixed point default value: no_value help: Default toggle-rate scale-factor of data signals based on clocks. attribute name: lp_default_probability category: lp_tcf (returns switching activity information) object type: instance access type: read-write data type: fixed point default value: 0.50000 help: Default probability for all nets within the hierarchical instance to be high. attribute name: lp_default_toggle_rate category: lp_tcf (returns switching activity information) object type: instance access type: read-write data type: fixed point default value: 0.02000 units: /ns help: Default signal toggle rate for all nets within the hierarchical instance. attribute name: lp_default_probability category: lp_tcf (returns switching activity information) object type: design access type: read-write data type: fixed point default value: 0.50000 help: Default probability for all nets in current design to be high. attribute name: lp_default_toggle_rate category: lp_tcf (returns switching activity information) object type: design access type: read-write data type: fixed point default value: 0.02000 units: /ns help: Default signal toggle rate for all top level nets in current design. rc:/> get_attr program_version /v08.10-s125_1
Note that I included the RC version I was using since this may have changed in recent release. I strongly encourage you to look at the low power user guide since there is ample information there, not only about what you are asking, but also as to how activity is propagated and other information you may find of value such as looking at power vs. time dynamic activity and other useful low power features.
In reply to grasshopper:
BTW, I meant the RTL Compiler Low Power User Guide
if the default toggle rate is 0.02 (1/ns), then is it changed by only setting clock period? or toggle rate should be set by setting its attribute?
I have a clock period of 500ps and default probability is 0.5 and I didn't tuch toggle rate attribute. In this case can I say that the power is reported for toggle rate of 1/250 ps == 4G, although timing shows a neg. slack time of -450?
In reply to naderi:
the answer to your question is no. toggle activity is independant from clock definitions on SDC. In general, dynamic power analysis with default rates is not terribly accurate. I suggest you use VCD, TCF, or SAIF from simulation to produce more accurate results. VCD is nice in that it allows you to look at time vs. power profile which further enable you to address the block responsible for peak power surges. If you have access to Palladium emulation and power is a hot ticket item for your team, I would certainly inquire about DPA.
PS: Please post RC questions in Logic Design forums. I think you will get more replies there