Specifications

Figure 7-1: Configuration Sequence for Cyclone V Devices
Power supplies including V
CCPD
and V
CCPGM
reach
recommended operating voltage
nSTATUS and nCONFIG released high
CONF_DONE pulled low
CONF_DONE released high
INIT_DONE released high
(if option enabled)
Power Up
• nSTATUS and CONF_DONE
released low
• All I/Os pins are tied to an
internal weak pull-up
• Clears configuration RAM bits
Reset
• nSTATUS and CONF_DONE
remain low
• All I/Os pins are tied to an
internal weak pull-up
• Samples MSEL pins
Initialization
• Initializes internal logic and
registers
• Enables I/O buffers
Configuration Error Handling
• nSTATUS pulled low
• CONF_DONE remains low
• Restarts configuration if option
enabled
User Mode
Executes your design
Configuration
Writes configuration data to
FPGA
You can initiate reconfiguration by pulling the nCONFIG pin low to at least the minimum t
CFG
low-pulse
width except for configuration using the partial reconfiguration operation. When this pin is pulled low, the
nSTATUS and CONF_DONE pins are pulled low and all I/O pins are tied to an internal weak pull-up.
Power Up
Power up all the power supplies that are monitored by the POR circuitry. All power supplies, including
V
CCPGM
and V
CCPD
, must ramp up from 0 V to the recommended operating voltage level within the ramp-
up time specification. Otherwise, hold the nCONFIG pin low until all the power supplies reach the
recommended voltage level.
V
CCPGM
Pin
The configuration input buffers do not have to share power lines with the regular I/O buffers in Cyclone V
devices.
Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
Altera Corporation
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CV-52007
Power Up
7-4
2013.06.11