Specifications
Pin Connections and Guidelines
Observe the following pin connections and guidelines for this configuration setup:
• Tie the following pins of all devices in the chain together:
•
nCONFIG
•
nSTATUS
•
DCLK
•
DATA[]
•
CONF_DONE
By tying the CONF_DONE and nSTATUS pins together, the devices initialize and enter user mode at the
same time. If any device in the chain detects an error, configuration stops for the entire chain and you
must reconfigure all the devices. For example, if the first device in the chain flags an error on the nSTATUS
pin, it resets the chain by pulling its nSTATUS pin low.
•
Ensure that DCLK and DATA[] are buffered for every fourth device to prevent signal integrity and clock
skew problems.
• All devices in the chain must use the same data width.
• If you are configuring the devices in the chain using the same configuration data, the devices must be of
the same package and density.
Using Multiple Configuration Data
To configure multiple Cyclone V devices in a chain using multiple configuration data, connect the devices
to an external host as shown in the following figure.
Figure 7-3: Multiple Device FPP Configuration Using an External Host When Both Devices Receive a Different
Set of Configuration Data
CONF_DONE
nSTATUS
nCE
nCONFIG
Memory
ADDR DATA[7..0]
GND
10 kΩ
10 kΩ
DCLK
nCEO
CONF_DONE
nSTATUS
nCE
nCONFIG
DCLK
nCEO
V
CCPGM
V
CCPGM
DATA[]
MSEL[4..0]
DATA[]
MSEL[4..0]
Buffers
External Host
(MAX II Device,
MAX V Device, or
Microprocessor)
FPGA Device Master
FPGA Device Slave
For more information, refer to
the MSEL pin settings.
You can leave the nCEO pin
unconnected or use it as a user
I/O pin when it does not feed
another device’s nCE pin.
Connect the repeater buffers between the
FPGA master and slave device for DATA[]
and DCLK for every fourth device.
Connect the resistor to a supply
that provides an acceptable input
signal for the FPGA device.
V
CCPGM
must be high enough to
meet the V
IH
specification of the
I/O on the device and the external
host. Altera recommends
powering up all configuration
system I/Os with V
CCPGM
.
N.C.
Configuration, Design Security, and Remote System Upgrades in Cyclone V Devices
Altera Corporation
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CV-52007
Pin Connections and Guidelines
7-10
2013.06.11