[POWER][PTPX] VCD SAIF FSDB

VCD: Value/Variable Change Dump

• ASCII file deifned in the IEEE1364 standard(Verilog HDL language standrad)
• Event based format which contains every value change for the signals in the design and the time at which they occured
• VCD는 PTPX의 average mode와 time-based analysis mode를 둘다 지원한다.
• Gate-level VCD 와 RTL-lvel VCD 가 이용되지만, RTL-level VCD를 사용할 때는 set_rtl_to_gate_name 을 통해서 name mapping을 설정해줘야 한다.

Example.  https://en.wikipedia.org/wiki/Value_change_dump

위키피디아, 내용을 살펴보기는 쉽지 않지만, 아래 waveform과 같이 보면, #시점의 데이터들이 위에서 정의한 순서대로 나열되는 것을 확인 할 수 있음.

 

 

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SAIF: Switching Activity Interface Format

• It presents system dynamic change rate, and usaually used in dynamice power analyze.
• Capture signal transition and the time spent at each logicallevel.
• It contains the toggle counts and static probabilities for the nets in the design.
  • Static probability is the probability that a signal is at a specific logic state, expressed as a number between 0 and 1. SP1 is the static probability that a signal is at logic-1, SP0 is at logic-0.
  • Relative to the total simulation time, the static probability is the ratio of time period. For example, if SP1=0.7, the signal is at high state 70 percent of the time.
  • Synopsys power tools, PTPX use SP1 when modeling switching activity.
  • Toggle rate/count is the number of logic-0-to-logic-1 or reverse transition of a design object, such as a net, pin, or port, per unit of time.
• Only supported in the average power analysis mode.
• ICC/ICC2 or some other tools only support SAIF format, so VCD need to convert to SAIF.

http://www.truevue.org/p/919

 

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FSDB: Fast Signal Database

Similar to the VCD wave file, but the redundant information in the VCD is removed so much smaller.

 

 

 

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Reference Lists

https://blog.fearcat.in/a?ID=01650-b81165d3-110d-45f9-88eb-3e910f4a9644#VCDSAIFFSDB_79 

PTPX power analysis actual combat, the difference between VCD, SAIF, FSDB - Fear Cat

https://blog.katastros.com/a?ID=00900-c12cafac-0d20-4df2-9bf2-39ee0ad894b8 

The difference between wave files (wlf, vcd, fsdb, shm, vpd) and how to generate them - Katastros

http://www.truevue.org/p/919

Switching Activity Interchange Format (SAIF) File – 东华博客

https://physicaldesign-asic.blogspot.com/2020/10/saif-file.html

SAIF File