EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 75

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Chapter 5: Clock Networks and PLLs in the Cyclone III Device Family
Cyclone III Device Family PLL Hardware Overview
© December 2009
f
Altera Corporation
Figure 5–7
Figure 5–7. External Clock Outputs for PLLs
Notes to
(1) These external clock enable signals are available only when using the ALTCLKCTRL megafunction.
(2) PLL#_CLKOUTp and PLL#_CLKOUTn pins are dual-purpose I/O pins that you can use as one single-ended or
Each pin of a differential output pair is 180° out of phase. The Quartus II software
places the NOT gate in your design into the I/O element to implement 180° phase
with respect to the other pin in the pair. The clock output pin pairs support the same
I/O standards as standard output pins (in the top and bottom banks) as well as LVDS,
LVPECL, differential HSTL, and differential SSTL.
To determine which I/O standards are supported by the PLL clock input and output
pins, refer to the
Cyclone III device family PLLs can drive out to any regular I/O pin through the
GCLK. You can also use the external clock output pins as general purpose I/O pins if
external PLL clocking is not required.
one differential clock output.
Figure
shows the external clock outputs for PLLs.
5–7:
Cyclone III Device I/O Features
PLL #
clkena 0
C0
C1
C2
C3
C4
PLL #_CLKOUTp
(1)
chapter.
PLL #_CLKOUTn
(2)
Cyclone III Device Handbook, Volume 1
clkena 1
(2)
(1)
5–11