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CLK15_6P Cyclone III Device Handbook
Prototype PCB
Part No.:   CLK15_6P
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Description:   Cyclone III Device Handbook
File Size :   7302 K    
Page : 274 Pages
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9–10
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
Initialization
In Cyclone III device family, the clock source for initialization is either a 10-MHz
(typical) internal oscillator (separate from the AS internal oscillator) or an optional
CLKUSR
pin. By default, the internal oscillator is the clock source for initialization. If
you use the internal oscillator, the device provides itself with enough clock cycles for a
proper initialization. When using the internal oscillator, you do not need to send
additional clock cycles from an external source to the
CLKUSR
pin during the
initialization stage. Additionally, you can use the
CLKUSR
pin as a user I/O pin.
You also have the flexibility to synchronize initialization of multiple devices or to
delay initialization with the
CLKUSR
option. The
CLKUSR
pin allows you to control
when your device enters user mode for an indefinite amount of time. You can turn on
the
Enable user-supplied start-up clock (CLKUSR)
option in the Quartus II software
from the
General
tab of the
Device and Pin Options
dialog box. When you turn on
the
Enable user supplied start-up clock option (CLKUSR)
option, the
CLKUSR
pin is
the initialization clock source. Supplying a clock on the
CLKUSR
pin does not affect the
configuration process. After the configuration data is accepted and
CONF_DONE
goes
high, the Cyclone III device family requires a certain amount of clock cycles to
initialize and to enter user mode.
lists the required clock cycles for proper initialization in Cyclone III device
family.
Table 9–5. Initialization Clock Cycles Required in Cyclone III Device Family
Device
Cyclone III
Cyclone III LS
Initialization Clock Cycles
3,185
3,192
lists the maximum CLKUSR frequency (f
MAX
) for Cyclone III device family.
Table 9–6. Maximum CLKUSR Frequency for Cyclone III Device Family
Device
Cyclone III
Cyclone III LS
f
MAX
(MHz)
133
100
1
If you use the optional
CLKUSR
pin and the
nCONFIG
pin is pulled low to restart
configuration during device initialization, ensure that the
CLKUSR
pin continues to
toggle when
nSTATUS
is low (a maximum of 230
s).
User Mode
An optional
INIT_DONE
pin is available that signals the end of initialization and the
start of user mode with a low-to-high transition. The
Enable INIT_DONE Output
option is available in the Quartus II software from the
General
tab of the
Device and
Pin Options
dialog box. If you use the
INIT_DONE
pin, it is high due to an external
10-k pull-up resistor when
nCONFIG
is low and during the beginning of
configuration. After the option bit to enable
INIT_DONE
is programmed into the device
Cyclone III Device Handbook
Volume 1
August 2012 Altera Corporation
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