Power Up; Reset; Configuration - Altera Cyclone V Device Handbook

7-4

Power Up

Figure 7-1: Configuration Sequence for Cyclone V Devices
You can initiate reconfiguration by pulling the
width except for configuration using the partial reconfiguration operation. When this pin is pulled low, the
and
nSTATUS CONF_DONE
Power Up
Power up all the power supplies that are monitored by the POR circuitry. All power supplies, including
V and V
CCPGM
up time specification. Otherwise, hold the
voltage level.
V Pin
CCPGM
The configuration input buffers do not have to share power lines with the regular I/O buffers in Cyclone V
devices.
Altera Corporation
Configuration Error Handling
• nSTATUS pulled low
• CONF_DONE remains low
• Restarts configuration if option
enabled
pins are pulled low and all I/O pins are tied to an internal weak pull-up.
, must ramp up from 0 V to the recommended operating voltage level within the ramp-
CCPD
Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
Power Up
• nSTATUS and CONF_DONE
driven low
• All I/Os pins are tied to an
internal weak pull-up
• Clears configuration RAM bits
Power supplies including V
recommended operating voltage

Reset

• nSTATUS and CONF_DONE
remain low
• All I/Os pins are tied to an
internal weak pull-up
• Samples MSEL pins
nSTATUS and nCONFIG released high
CONF_DONE pulled low

Configuration

Writes configuration data to
FPGA
CONF_DONE released high
Initialization
• Initializes internal logic and
registers
• Enables I/O buffers
INIT_DONE released high
(if option enabled)
User Mode
Executes your design
pin low to at least the minimum t
nCONFIG
pin low until all the power supplies reach the recommended
nCONFIG
and V reach
CCPD CCPGM
low-pulse
CFG
Send Feedback
CV-52007
2014.01.10