HyperText
New Member
Hi,
https://i.imgur.com/vsNsjOh.png
suppose that I have an FPGA, and, based on the image above, that I have a circuit that is synthesized on the bottom-left part of the FPGA (green box). Furthermore, suppose that I synthesized another circuit (red box) that surrounds the first. This last circuit is a high power demanding circuit, and it is basically a "disturbing circuit" (it is useless). I'd like to know if the red "disturbing" circuit, which is located very closely to the green one, might influence in some way the green circuit (I'm talking about ANY influence it might have, such as timings constraints, power instability, or whatever, and why).
I'm asking this question because from experiments on Xilinx Spartan-3E FPGA I noticed that the green circuit behaves differently depending on the position of the red one. Assuming that I have a ring oscillator (green box) and that I can measure its frequency, I noticed that when the red disturbing circuit is close to the ring oscillator circuit, the ring oscillator's frequency is slower than when the red circuit is far away.
I'd like to investigate the causes of this behavior. Any direction is welcomed
Thanks
https://i.imgur.com/vsNsjOh.png
suppose that I have an FPGA, and, based on the image above, that I have a circuit that is synthesized on the bottom-left part of the FPGA (green box). Furthermore, suppose that I synthesized another circuit (red box) that surrounds the first. This last circuit is a high power demanding circuit, and it is basically a "disturbing circuit" (it is useless). I'd like to know if the red "disturbing" circuit, which is located very closely to the green one, might influence in some way the green circuit (I'm talking about ANY influence it might have, such as timings constraints, power instability, or whatever, and why).
I'm asking this question because from experiments on Xilinx Spartan-3E FPGA I noticed that the green circuit behaves differently depending on the position of the red one. Assuming that I have a ring oscillator (green box) and that I can measure its frequency, I noticed that when the red disturbing circuit is close to the ring oscillator circuit, the ring oscillator's frequency is slower than when the red circuit is far away.
I'd like to investigate the causes of this behavior. Any direction is welcomed
Thanks