Notes to tables: (1) To implement the C" />
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39
ACEX 1K Programmable Logic Device Family Data Sheet
D
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lo
pm
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To
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ls
Notes to tables:
(1)
To implement the ClockLock and ClockBoost circuitry with the Altera software, designers must specify the input
frequency. The Altera software tunes the PLL in the ClockLock and ClockBoost circuitry to this frequency. The
fCLKDEV parameter specifies how much the incoming clock can differ from the specified frequency during device
operation. Simulation does not reflect this parameter.
(2)
Twenty-five thousand parts per million (PPM) equates to 2.5% of input clock period.
(3)
During device configuration, the ClockLock and ClockBoost circuitry is configured before the rest of the device. If
the incoming clock is supplied during configuration, the ClockLock and ClockBoost circuitry locks during
configuration because the tLOCK value is less than the time required for configuration.
(4)
The tJITTER specification is measured under long-term observation. The maximum value for tJITTER is 200 ps if
tINCLKSTB is lower than 50 ps.
I/O
Configuration
This section discusses the PCI pull-up clamping diode option, slew-rate
control, open-drain output option, and MultiVolt I/O interface for
ACEX 1K devices. The PCI pull-up clamping diode, slew-rate control, and
open-drain output options are controlled pin-by-pin via Altera software
logic options. The MultiVolt I/O interface is controlled by connecting
VCCIO to a different voltage than VCCINT. Its effect can be simulated in the
Altera software via the Global Project Device Options dialog box (Assign
menu).
Table 12. ClockLock & ClockBoost Parameters for -2 Speed-Grade Devices
Symbol
Parameter
Condition
Min
Typ
Max
Unit
tR
Input rise time
5ns
tF
Input fall time
5ns
tINDUTY
Input duty cycle
40
60
%
fCLK1
Input clock frequency (ClockBoost clock
multiplication factor equals 1)
25
80
MHz
fCLK2
Input clock frequency (ClockBoost clock
multiplication factor equals 2)
16
40
MHz
fCLKDEV
Input deviation from user specification in
the software (1)
25,000
PPM
tINCLKSTB Input clock stability (measured between
adjacent clocks)
100
ps
tLOCK
Time required for ClockLock or ClockBoost
to acquire lock (3)
10
s
tJITTER
Jitter on ClockLock or ClockBoost-
generated clock (4)
tINCLKSTB < 100
250 (4)
ps
tINCLKSTB < 50
200 (4)
ps
tOUTDUTY Duty cycle for ClockLock or ClockBoost-
generated clock
40
50
60
%
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