EP2AGX45DF29I5N Altera, EP2AGX45DF29I5N Datasheet - Page 35

• Manufacturer Part Number: EP2AGX45DF29I5N
• Description: IC ARRIA II GX FPGA 45K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX45DF29I5N

• Number Of Logic Elements/cells: 42959
• Number Of Labs/clbs: 1805
• Total Ram Bits: 3435
• Number Of I /o: 364
• Voltage - Supply: 0.87 V ~ 0.93 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 100°C
• Package / Case: 780-FBGA
• Family Name: Arria® II GX
• Number Of Logic Blocks/elements: 45125
• # I/os (max): 364
• Frequency (max): 500MHz
• Operating Supply Voltage (typ): 900mV
• Logic Cells: 45125
• Ram Bits: 3565158.4
• Operating Supply Voltage (min): 0.87V
• Operating Supply Voltage (max): 0.93V
• Operating Temp Range: -40C to 100C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 780
• Package Type: FC-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Gates: -
• Lead Free Status / Rohs Status: Compliant

Chapter 2: Logic Array Blocks and Adaptive Logic Modules in Arria II GX Devices
Adaptive Logic Modules
© June 2009 Altera Corporation
1
In arithmetic mode, the ALM support simultaneous use of the adder ’s carry output
along with combinational logic outputs. In this operation, the adder output is ignored.
This usage of the adder with the combinational logic output provides resource
savings of up to 50%.
Arithmetic mode also offers clock enable, counter enable, synchronous up and down
control, add and subtract control, synchronous clear, and synchronous load. The LAB
local interconnect data inputs generate the clock enable, counter enable, synchronous
up and down, and add and subtract control signals. These control signals are good
candidates for the inputs that are shared between the four LUTs in the ALM. The
synchronous clear and synchronous load options are LAB-wide signals that affect all
registers in the LAB. These signals can also be individually disabled or enabled per
register. The Quartus II software automatically places any registers that are not used
by the counter into other LABs.
Carry Chain
The carry chain provides a fast carry function between the dedicated adders in
arithmetic or shared arithmetic mode. The two-bit carry select feature in Arria II GX
devices halves the propagation delay of carry chains within the ALM. Carry chains
can begin in either the first ALM or the fifth ALM in a LAB. The final carry-out signal
is routed to an ALM, where it is fed to local, row, or column interconnects.
The Quartus II Compiler automatically creates carry chain logic during design
processing, or you can create it manually during design entry. Parameterized
functions such as library of parameterized modules (LPM) automatically take
advantage of carry chains for the appropriate functions.
The Quartus II Compiler creates carry chains longer than 20 ALMs (10 ALMs in
arithmetic or shared arithmetic mode) by linking LABs together automatically. For
enhanced fitting, a long carry chain runs vertically, allowing fast horizontal
connections to TriMatrix memory and DSP blocks. A carry chain can continue as far as
a full column.
To avoid routing congestion in one small area of the device when a high fan-in
arithmetic function is implemented, the LAB can support carry chains that only use
either the top half or bottom half of the LAB before connecting to the next LAB. This
leaves the other half of the ALMs in the LAB available for implementing narrower
fan-in functions in normal mode. Carry chains that use the top five ALMs in the first
LAB carry into the top half of the ALMs in the next LAB in the column. Carry chains
that use the bottom five ALMs in the first LAB carry into the bottom half of the ALMs
in the next LAB within the column. In every alternate LAB column, the top half can be
bypassed; in the other MLAB columns, the bottom half can be bypassed.
For more information on carry chain interconnect, refer to
page
2–13.
Arria II GX Device Handbook, Volume 1
“ALM Interconnects” on
2–9