Zedboard Clock Speed

I have ported LMBench to run on the Zedboard, and in doing so the benchmark reported that the core is running at 800MHz, not 677MHz. I'm running Linaro's nano linux as my OS.

I decided to dig deeper, and found that there's supposed to be a speed grade marking on the chip right before the CLG484 text. On my chip, there is no speed grade marking. I'm wondering if the board I have is actually an 800MHz board?

I've also heard the dev/eval kit board chips have the exact same text written on them as the Zedboard chips.

0 bhfletcher over 12 years ago

The current ZedBoards have ES Zynq silicon, which does not have a speed grade, which would explain why you see no marking in the speed grade position. When production Zynq silicon is available, the ZedBoard will ship with a -1 device, which has a max cpu clock frequency of 667 MHz.

The default design that ships with the ZedBoard is set to 667 MHz, as is the default XML board description file. It is possible that ZedBoards with ES silicon will operate at 800 MHz, but that is not the intention given the plans to ship with a -1.

Bryan
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0 Former Member over 12 years ago

I am thinking of buying Zedboard and this information combined with my another recent finding that Zynq-7020 uses AXI3 bus instead of AXI4, has put me in dilemma: should I buy Zedboard with a ES and AXI3 bus on it? While Xilinx is putting efforts on migrating all the cores to AXI4, I would rather wait if it is not too long. Any idea when will the Zedboard with production samples and higher-end Zynq devices be available?
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0 bhfletcher over 12 years ago

ZedBoard with Production Zynq 7020 is expected to be available mid-May. We do not plan on building ZedBoard with a different Zynq device. If you want a higher-end Zynq device, you could consider the ZC706:
http://www.em.avnet.com/en-us/design/drc/Pages/Xilinx-Zynq-7000-SoC-ZC706-Evaluation-Kit.aspx

Bryan
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