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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPEAR1310 датащи(PDF) 13 Page - STMicroelectronics |
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SPEAR1310 датащи(HTML) 13 Page - STMicroelectronics |
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13 / 57 page  SPEAr1310 Clock and reset system Doc ID 17528 Rev 4 13/57 4 Clock and reset system This centralized structure provides system synchronization and includes the following features: ● Six PLLs. Four of them are fully programmable and offer an EMI reduction mode (spread spectrum clock generation through dithering) that can replace all traditional EMI reduction techniques. – PLL1 programmable dithered pll, dedicated for Core1 & 2 & AXI/AHB bus & peripherals. Both core need to run at the same speed – PLL2 programmable dithered PLL, dedicated for the 125 MHz clock of the Gigabit Ethernet MACs – PLL3 programmable dithered PLL, for specific embedded IP functions – PLL4 programmable dithered PLL, dedicated for the DDR memory controller (Asynchronous access memory mode) – PLL5 low jitter, dedicated for the USB – PLL6 for the PCIe controllers ● Several synthesizers provide different frequencies for different IPs ● Fully programmable control of clock and reset signals for all slave blocks allowing sophisticated power management. |
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