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ID: 2491
实例类型: faq
分类: Architecture
相关: PLL/DLL/Clock Routing
产品系列: All FPGA

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All Devices: Is the PLL Lock time, Tlock, measured from power ramp up?

The lock time of the PLL is not gated to power ramp up, it is dependent on the reset signal. After the FPGA is finished configuring, a global reset signal (GSR) is asserted to the chip prior to waking up and operating. PLL lock time, Tlock, is specified from the time the GSR is released to the time of lock, as long as the input clock is consistent.