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EP2C8AT324I7N Datasheet(PDF) 88 Page - Altera Corporation

Part No. EP2C8AT324I7N
Description  Section I. Cyclone II Device Family Data Sheet
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP2C8AT324I7N Datasheet(HTML) 88 Page - Altera Corporation

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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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