EP3C25F256C7N Altera, EP3C25F256C7N Datasheet - Page 197

• Manufacturer Part Number: EP3C25F256C7N
• Description: IC CYCLONE III FPGA 256-FBGA
• Manufacturer: Altera
• Series: Cyclone® IIIr

Specifications of EP3C25F256C7N

• Number Of Logic Elements/cells: 24624
• Number Of Labs/clbs: 1539
• Total Ram Bits: 608256
• Number Of I /o: 156
• Voltage - Supply: 1.15 V ~ 1.25 V
• Mounting Type: Surface Mount
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 256-FBGA
• Family Name: Cyclone III
• Number Of Logic Blocks/elements: 24624
• # I/os (max): 156
• Frequency (max): 437.5MHz
• Process Technology: 65nm
• Operating Supply Voltage (typ): 1.2V
• Logic Cells: 24624
• Ram Bits: 608256
• Operating Supply Voltage (min): 1.15V
• Operating Supply Voltage (max): 1.25V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 256
• Package Type: FBGA
• For Use With: 544-2370 - KIT STARTER CYCLONE III EP3C25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / Rohs Status: Compliant
• Other names: Q4433068

Chapter 9: Configuration, Design Security, and Remote System Upgrades in the Cyclone III Device Family
Configuration Features
© December 2009
Altera Corporation
In a multi-device PS configuration, the nCE pin of the first device is connected to GND
while its nCEO pin is connected to the nCE pin of the next device in the chain. The nCE
input of the last device comes from the previous device, while its nCEO pin is left
floating. After the first device completes configuration in a multi-device configuration
chain, its nCEO pin drives low to activate the nCE pin of the second device, which
prompts the second device to begin configuration. The second device in the chain
begins configuration in one clock cycle. Therefore, the transfer of data destinations is
transparent to the external host device. All other configuration pins (nCONFIG,
nSTATUS, DCLK, DATA[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.
Because all device CONF_DONE pins are tied together, all devices initialize and enter
user mode at the same time.
If any device detects an error, configuration stops for the entire chain and the entire
chain must be reconfigured because all nSTATUS and CONF_DONE pins are tied
together. For example, if the first device flags an error on nSTATUS, it resets the chain
by pulling its nSTATUS pin low. This behavior is similar to a single device detecting
an error.
You can have multiple devices that contain the same configuration data in your
system. To support this configuration scheme, all device nCE inputs are tied to GND,
while the nCEO pins are left floating. All other configuration pins (nCONFIG,
nSTATUS, DCLK, DATA[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.
Cyclone III Device Handbook, Volume 1
9–37