EP4SE530H35C2N Altera, EP4SE530H35C2N Datasheet - Page 159
EP4SE530H35C2N
Manufacturer Part Number
EP4SE530H35C2N
Description
IC STRATIX IV FPGA 530K 1152HBGA
Manufacturer
Altera
Series
STRATIX® IV Er
Datasheets
1.EP4SGX110DF29C3N.pdf
(80 pages)
2.EP4SGX110DF29C3N.pdf
(1154 pages)
3.EP4SGX110DF29C3N.pdf
(432 pages)
4.EP4SGX110DF29C3N.pdf
(22 pages)
5.EP4SGX110DF29C3N.pdf
(72 pages)
6.EP4SE230F29C3N.pdf
(12 pages)
Specifications of EP4SE530H35C2N
Number Of Logic Elements/cells
531200
Number Of Labs/clbs
21248
Total Ram Bits
27376
Number Of I /o
744
Voltage - Supply
0.87 V ~ 0.93 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
1152-HBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
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Manufacturer
Quantity
Price
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Part Number:
EP4SE530H35C2N
Manufacturer:
ALTERA
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147
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Chapter 5: Clock Networks and PLLs in Stratix IV Devices
PLLs in Stratix IV Devices
Figure 5–38. VCO Switchover Operating Frequency
February 2011 Altera Corporation
PLL Reconfiguration
ΔF vco
■
■
■
■
PLLs use several divide counters and different VCO phase taps to perform frequency
synthesis and phase shifts. In Stratix IV PLLs, you can reconfigure both the counter
settings and phase-shift the PLL output clock in real time. You can also change the
charge pump and loop-filter components, which dynamically affects PLL bandwidth.
You can use these PLL components to update the output-clock frequency and PLL
bandwidth and to phase-shift in real time, without reconfiguring the entire Stratix IV
device.
The ability to reconfigure the PLL in real time is useful in applications that operate at
multiple frequencies. It is also useful in prototyping environments, allowing you to
sweep PLL output frequencies and adjust the output-clock phase dynamically. For
instance, a system generating test patterns is required to generate and transmit
patterns at 75 or 150 MHz, depending on the requirements of the device under test.
Reconfiguring the PLL components in real time allows you to switch between two
such output frequencies within a few microseconds. You can also use this feature to
adjust clock-to-out (tCO) delays in real time by changing the PLL output clock phase
shift. This approach eliminates the need to regenerate a configuration file with the
new PLL settings.
After a switchover occurs, there may be a finite resynchronization period for the
PLL to lock onto a new clock. The exact amount of time it takes for the PLL to
re-lock depends on the PLL configuration.
The phase relationship between the input clock to the PLL and the output clock
from the PLL is important in your design. Assert areset for at least 10 ns after
performing a clock switchover. Wait for the locked signal to go high and be stable
before re-enabling the output clocks from the PLL.
Figure 5–38
clock is lost and then increases as the VCO locks on to the backup clock.
Disable the system during clock switchover if it is not tolerant of frequency
variations during the PLL resynchronization period. You can use the clkbad[0]
and clkbad[1] status signals to turn off the PFD (PFDENA = 0) so the VCO
maintains its most recent frequency. You can also use the state machine to switch
over to the secondary clock. When the PFD is re-enabled, output clock-enable
signals (clkena) can disable clock outputs during the switchover and
resynchronization period. When the lock indication is stable, the system can
re-enable the output clocks.
Primary Clock Stops Running
shows how the VCO frequency gradually decreases when the current
Switchover Occurs
VCO Tracks Secondary Clock
Stratix IV Device Handbook Volume 1
5–43
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