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EP2C35A15F324C6N Datasheet(PDF) 88 Page - Altera Corporation |
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EP2C35A15F324C6N Datasheet(HTML) 88 Page - Altera Corporation |
88 / 168 page ![]() 4–6 Altera Corporation Cyclone II Device Handbook, Volume 1 February 2007 Power-On Reset Circuitry For Cyclone II devices, wake-up time consists of power-up, POR, configuration, and initialization. The device must properly go through all four stages to configure correctly and begin operation. You can calculate wake-up time using the following equation: Figure 4–3 illustrates the components of wake up time. Figure 4–3. Cyclone II Wake-Up Time Note to Figure 4–3: (1) VCC ramp must be monotonic. The VCC ramp time and POR time will depend on the device characteristics and the power supply used in your system. The fast-on devices require a maximum VCC ramp time of 2 ms and have a maximum POR time of 12 ms. Configuration time will depend on the configuration mode chosen and the configuration file size. You can calculate configuration time by multiplying the number of bits in the configuration file with the period of the configuration clock. For fast configuration times, you should use Passive Serial (PS) configuration mode with maximum DCLK frequency of 100 MHz. In addition, you can use compression to reduce the configuration file size and speed up the configuration time. The tCD2UM or tCD2UMC parameters will determine the initialization time. 1 For more information on the tCD2UM or tCD2UMC parameters, refer to the Configuring Cyclone II Devices chapter in the Cyclone II Device Handbook. Wake-Up Time = VCC Ramp Time + POR Time + Configuration Time + Initialization Time VCC Ramp Time POR Time Configuration Time Initialization Time VCC Minimum Voltage Time User Mode |
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