Specifications

Related Information
Cyclone V Device Datasheet
Provides more information about t
STATUS
and t
CFG
timing parameters.
Initialization
The initialization clock source is from the internal oscillator, CLKUSR pin, or DCLK pin. By default, the
internal oscillator is the clock source for initialization. If you use the internal oscillator, the Cyclone V device
will be provided with enough clock cycles for proper initialization.
If you use the optional CLKUSR pin as the initialization clock source and the nCONFIG pin is pulled
low to restart configuration during device initialization, ensure that the CLKUSR or DCLK pin
continues toggling until the nSTATUS pin goes low and then goes high again.
Note:
The CLKUSR pin provides you with the flexibility to synchronize initialization of multiple devices or to
delay initialization. Supplying a clock on the CLKUSR pin during initialization does not affect configuration.
After the CONF_DONE pin goes high, the CLKUSR or DCLK pin is enabled after the time specified by t
CD2CU
.
When this time period elapses, Cyclone V devices require a minimum number of clock cycles as specified
by T
init
to initialize properly and enter user mode as specified by the t
CD2UMC
parameter.
Related Information
Cyclone V Device Datasheet
Provides more information about t
CD2CU
, t
init
, and t
CD2UMC
timing parameters, and initialization clock
source.
User Mode
You can enable the optional INIT_DONE pin to monitor the initialization stage. After the INIT_DONE
pin is pulled high, initialization completes and your design starts executing. The user I/O pins will then
function as specified by your design.
Device Configuration Pins
Configuration Pins Summary
The following table lists the Cyclone V configuration pins and their power supply.
The TDI, TMS, TCK, and TDO pins are powered by V
CCPD
of the bank in which the pin resides.
Note:
The CLKUSR, DEV_OE, DEV_CLRn, and DATA[15..5] pins are powered by V
CCPGM
during
configuration and by V
CCIO
of the bank in which the pin resides if you use it as a user I/O pin.
Note:
Table 7-3: Configuration Pin Summary for Cyclone V Devices
Powered ByUser ModeInput/OutputConfiguration
Scheme
Configuration Pin
V
CCPD
—InputJTAG
TDI
V
CCPD
—InputJTAG
TMS
Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
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Initialization
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2013.06.11