EP3C16F484I7N Altera, EP3C16F484I7N Datasheet - Page 87

• Manufacturer Part Number: EP3C16F484I7N
• Description: Cyclone III
• Manufacturer: Altera

Specifications of EP3C16F484I7N

• Family Name: Cyclone III
• Number Of Logic Blocks/elements: 15408
• # I/os (max): 346
• Frequency (max): 437.5MHz
• Process Technology: 65nm
• Operating Supply Voltage (typ): 1.2V
• Logic Cells: 15408
• Ram Bits: 516096
• Operating Supply Voltage (min): 1.15V
• Operating Supply Voltage (max): 1.25V
• Operating Temp Range: -40C to 100C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 484
• Package Type: FBGA
• Lead Free Status / Rohs Status: Compliant

Chapter 5: Clock Networks and PLLs in the Cyclone III Device Family
Phase Shift Implementation
Figure 5–18. Delay Insertion Using VCO Phase Output and Counter Delay Time
© December 2009
CLK0
CLK1
CLK2
135
180
225
270
315
45
90
0
1/8 t
VCO
Altera Corporation
Coarse resolution phase shifts are implemented by delaying the start of the counters
for a predetermined number of counter clocks.
shift.
Equation 5–2. Coarse Resolution Phase Shift
C is the count value set for the counter delay time (this is the initial setting in the PLL
usage section of the compilation report in the Quartus II software). If the initial value
is 1, C – 1 = 0° phase shift.
Figure 5–18
VCO phase taps method. The eight phases from the VCO are shown and labeled for
reference. In this example, CLK0 is based on 0
value for the counter set to one. The CLK1 signal is divided by four, two VCO clocks
for high time and two VCO clocks for low time. CLK1 is based on the 135° phase tap
from the VCO and has the C value for the counter set to one. The CLK1 signal is also
divided by four. In this case, the two clocks are offset by 3 Φ
0° phase from the VCO but has the C value for the counter set to three. This creates a
delay of two Φ
You can use the coarse and fine phase shifts to implement clock delays in the
Cyclone III device family.
The Cyclone III device family supports dynamic phase shifting of VCO phase taps
only. The phase shift is configurable for any number of times. Each phase shift takes
about one scanclk cycle, allowing you to implement large phase shifts quickly.
Φ coarse
t
d0-1
=
t
d0-2
C 1
----------- -
f
VCO
–
shows an example of phase shift insertion using fine resolution through
coarse
t
=
VCO
(
-------------------- -
C 1
(two complete VCO periods).
Mf
–
R EF
) N
°
phase from the VCO and has the C
Equation 5–2
Cyclone III Device Handbook, Volume 1
fine
shows the coarse phase
. CLK2 is based on the
5–23