EP4CE30F29C7N Datasheet, PDF (221/488 Pages) Altera Corporation – Cyclone IV Device Handbook, Volume 1

Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
Configuration
8–57
Reconfiguration
After the configuration data is successfully written into the serial configuration
device, the Cyclone IV device does not automatically start reconfiguration. The
intelligent host issues the PULSE_NCONFIG JTAG instruction to initialize the
reconfiguration process. During reconfiguration, the master device is reset and the
SFL design no longer exists in the Cyclone IV device and the serial configuration
device configures all the devices in the chain with the user design.
f For more information about the SFL, refer to AN 370: Using the Serial FlashLoader with
Quartus II Software.
JTAG Instructions
f For more information about the JTAG binary instruction code, refer to the JTAG
Boundary-Scan Testing for Cyclone IV Devices chapter.
I/O Reconfiguration
Use the CONFIG_IO instruction to reconfigure the I/O configuration shift register
(IOCSR) chain. This instruction allows you to perform board-level testing prior to
configuring the Cyclone IV device or waiting for a configuration device to complete
configuration. After the configuration is interrupted and JTAG testing is complete,
you must reconfigure the part through the PULSE_NCONFIG JTAG instruction or by
pulsing the nCONFIG pin low.
You can issue the CONFIG_IO instruction any time during user mode.
You must meet the following timing restrictions when using the CONFIG_IO
instruction:
■ The CONFIG_IO instruction cannot be issued when the nCONFIG pin is low
■ You must observe a 230 μs minimum wait time after any of the following
conditions:
■ nCONFIG pin goes high
■ Issuing the PULSE_NCONFIG instruction
■ Issuing the ACTIVE_ENGAGE instruction, before issuing the CONFIG_IO instruction
■ You must wait 230 μs after power up, with the nCONFIG pin high before issuing the
CONFIG_IO instruction (or wait for the nSTATUS pin to go high)
May 2013 Altera Corporation
Cyclone IV Device Handbook,
Volume 1