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The frequency of GIC-400 in Juno SoC

wangyong

Hi,

I read Juno trm, but I didn't find the frequency of GIC-400 in Juno SoC. Because Cortex-A57 and  Cortex-A53 operate at diferent frequency and support DVFS, I think that GIC-400 should operate asynchronously with Cortex-A57 and Cortex-A53. This may cause more interrupt latency. Right?

Thanks.

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    Hi,

    It's correct that the GIC clock is not linked directly to the CPU clock. I don't know what the exact GIC clock freq is on Juno, without deeper investigation. However several hundreds of MHz is typical, 500MHz would be a reasonable guess. Pragmatically, the changes to CPU CLK (caused by the DVFS operating points on offer) wouldn't cause interrupt latency issues in a system of this type. There are many other dominant factors in hardware (& software).

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  • 0

    Hi,

    It's correct that the GIC clock is not linked directly to the CPU clock. I don't know what the exact GIC clock freq is on Juno, without deeper investigation. However several hundreds of MHz is typical, 500MHz would be a reasonable guess. Pragmatically, the changes to CPU CLK (caused by the DVFS operating points on offer) wouldn't cause interrupt latency issues in a system of this type. There are many other dominant factors in hardware (& software).

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