EP4CE6E22C8N Altera, EP4CE6E22C8N Datasheet - Page 95
EP4CE6E22C8N
Manufacturer Part Number
EP4CE6E22C8N
Description
IC CYCLONE IV FPGA 6K 144EQFP
Manufacturer
Altera
Series
CYCLONE® IV Er
Datasheets
1.EP4CGX15BN11C8N.pdf
(44 pages)
2.EP4CGX15BN11C8N.pdf
(14 pages)
3.EP4CGX15BN11C8N.pdf
(478 pages)
4.EP4CGX15BN11C8N.pdf
(10 pages)
Specifications of EP4CE6E22C8N
Number Of Logic Elements/cells
6272
Number Of Labs/clbs
392
Total Ram Bits
270000
Number Of I /o
91
Voltage - Supply
1.15 V ~ 1.25 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
144-EQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
Lead Free Status / Rohs Status
Compliant
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Chapter 5: Clock Networks and PLLs in Cyclone IV Devices
Phase Shift Implementation
© December 2010 Altera Corporation
Equation 5–1. Fine Resolution Phase Shift
Equation 5–1
in which f
For example, if f
depends on reference clock frequency and counter settings.
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 5–21
VCO phase taps method. The eight phases from the VCO are shown and labeled for
reference. In this example, CLK0 is based on 0° phase from the VCO and has the C
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
0° phase from the VCO but has the C value for the counter set to three. This creates a
delay of two
fine
= 156.25 ps. The PLL operating frequency defines this phase shift, a value that
REF
shows an example of phase shift insertion using fine resolution through
is the input reference clock frequency.
shows the minimum delay time that you can insert using this method.
coarse
REF
is 100 MHz, N = 1, and M = 8, then f
(two complete VCO periods).
fine
coarse
=
T
-----------
VCO
8
=
=
C 1
----------- -
f
VCO
------------- -
8f
–
VCO
1
=
Equation 5–2
=
-------------------- -
C 1
Mf
----------------- -
8Mf
–
REF
N
N
REF
VCO
Cyclone IV Device Handbook, Volume 1
= 800 MHz, and
fine
shows the coarse phase
. CLK2 is based on the
5–33
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