9–46
Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
If a system has multiple devices that contain the same configuration data, tie all
device
nCE
inputs to GND and leave
nCEO
pins floating. All other configuration pins
(nCONFIG,
nSTATUS, DCLK, DATA[7..0],
and
CONF_DONE)
are connected to every device in
the chain. Configuration signals can require buffering to ensure signal integrity and
prevent clock skew problems. Ensure that the
DCLK
and
DATA
lines are buffered.
Devices must be of the same density and package. All devices start and complete
configuration at the same time.
shows multi-device FPP configuration when both Cyclone III device
family is receiving the same configuration data.
Figure 9–22. Multi-Device FPP Configuration Using an External Host When Both Devices Receive
the Same Data
Memory
VCCIO
(1)
VCCIO
(1)
ADDR DATA[7..0]
10 k
10 k
MSEL[3..0]
CONF_DONE
nSTATUS
nCEO
nCE
GND
DATA[7..0]
(4)
nCONFIG
DCLK
(4)
(3)
Cyclone III Device Family 1
Cyclone III Device Family 2
MSEL[3..0]
CONF_DONE
nSTATUS
nCEO
nCE
GND
DATA[7..0]
(4)
nCONFIG
DCLK
(4)
(3)
External Host
(MAX II Device or
Microprocessor)
N.C. (2)
N.C. (2)
Buffers (4)
Notes to
(1) The pull-up resistor must be connected to a supply that provides an acceptable input signal for all devices in the
chain. V
CC
must be high enough to meet the V
IH
specification of the I/O on the device and the external host.
(2) The
nCEO
pins of both devices are left unconnected or used as user I/O pins when configuring the same configuration
data into multiple devices.
(3) The MSEL pin settings vary for different configuration voltage standards and POR time. To connect
MSEL[3..0],
refer to
Connect the MSEL pins directly to V
CCA
or GND.
(4) All I/O inputs must maintain a maximum AC voltage of 4.1 V.
DATA[7..0]
and
DCLK
must fit the maximum overshoot
equation outlined in
You can use a single configuration chain to configure Cyclone III device family with
other Altera devices that support the FPP configuration. To ensure that all devices in
the chain complete configuration at the same time or that an error flagged by one
device starts reconfiguration in all devices, tie all the device
CONF_DONE
and
nSTATUS
pins together.
f
For more information about configuring multiple Altera devices in the same
configuration chain, refer to the
chapter in
volume 2 of the
Configuration Handbook.
Cyclone III Device Handbook
Volume 1
August 2012 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
