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Chapter 8: Configuration and Remote System Upgrades in Cyclone IV Devices
8–57
Configuration
May 2013
Altera Corporation
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
JTAG Instructions
f
For more information about the JTAG binary instruction code, refer to the
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
s 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
s after power up, with the
nCONFIG
pin high before issuing the
CONFIG_IO
instruction (or wait for the
nSTATUS
pin to go high)
Содержание Cyclone IV
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