4-26
PLL Control Signals
Figure 4-25: Dual-Purpose Clock I/O Pins Associated with PLL for Stratix V Devices
SV51005
2014.01.10
C0
EXTCLKOUT[0]
I/O / FPLL_<#>_CLKOUT0/ FPLL_<#>_CLKOUTp/
Fractional PLL0
VCO 0
C1
C2
C3
C4
fbin0
FPLL_<#>_FB0
C5
C6
C7
You can feed these clock output pins using any one
of the C[17..0] or M counters. When not used as
Fractional PLL1
VCO 1
C8
C9
C10
C11
C12
C13
C14
C15
C16
20
mux
EXTCLKOUT[3..0]
4
EXTCLKOUT[1]
EXTCLKOUT[2]
fbin1
I/O / FPLL_<#>CLKOUT1/
FPLL_<#>_CLKOUTn
I/O / FPLL_<#>_CLKOUT2 /
FPLL<#>_FBp / FPLL_<#>_FB1
external clock outputs, these clock output pins can
be used as
regular user I/Os.
The FPLL_<#>_CLKOUT0, FPLL_<#>_CLKOUT1,
FPLL_<#>_CLKOUT2, and FPLL_<#>_CLKOUT3
pins are single-ended clock output pins.
The FPLL_<#>_CLKOUTp and
FPLL_<#>_CLKOUTn pins are differential output
pins while the FPLL_<#>_FBp and FPLL_<#>_FBn
C17
M0
pins are differential feedback input pins to support
differential EFB only in VCO 1.
M1
EXTCLKOUT[3]
I/O / FPLL_<#>_CLKOUT3 /
FPLL_<#>_FBn
The FPLL_<#>_FB0 and
FPLL_<#>_FB1 pins are single-ended
feedback input pins.
Each pin of a single-ended output pair can be either in-phase or 180° out-of-phase. To implement the 180°
out-of-phase pin in a pin pair, the Quartus II software places a NOT gate in the design into the IOE.
The clock output pin pairs support the following I/O standards:
?
?
?
?
Same I/O standard for the pin pairs
LVDS
Differential high-speed transceiver logic (HSTL)
Differential SSTL
Stratix V PLLs can drive out to any regular I/O pin through the GCLK or RCLK network. You can also use
the external clock output pins as user I/O pins if you do not require external PLL clocking.
Related Information
Provides more information about I/O standards supported by the PLL clock input and output pins.
? Zero-Delay Buffer Mode on page 4-30
? External Feedback Mode on page 4-31
PLL Control Signals
You can use the areset signal to control PLL operation and resynchronization, and use the locked signal
to observe the status of the PLL.
areset
The areset signal is the reset or resynchronization input for each PLL. The device input pins or internal
logic can drive these input signals.
When areset is driven high, the PLL counters reset, clearing the PLL output and placing the PLL out-of-
lock. The VCO is then set back to its nominal setting. When areset is driven low again, the PLL
resynchronizes to its input as it re-locks.
Altera Corporation
Clock Networks and PLLs in Stratix V Devices
Send Feedback
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