alliance-support '1999
floating ground in rom


Ken Spicer (spicer@atmel.com)
Tue, 11 May 99 11:17:07 EDT

Hi Guys, We have been able to successfully generate a 4096w by 16bit rom using Grog. We are still unable to netlist and simulate this rom using the alliance tools. However, we have extracted a netlist using cadence tools and simulated the rom using "TimeMill" which is now a Synopsys tool. The simulations show that the rom has a ground that gradually floats toward 2.5volts. As the simulation steps through the low addresses for approximately the first 1000ns you can see that the memory contents appear to be correct. As the ground level rises the rom stops working. Have you seen this phenomenon before? Do you have any ideas as to what is going on? Any suggestions? Thanks for your help. Yours, Ken Spicer spicer@atmel.com

 



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