EP2AGX45DF29I5 Altera, EP2AGX45DF29I5 Datasheet - Page 92

• Manufacturer Part Number: EP2AGX45DF29I5
• Description: IC ARRIA II GX FPGA 45K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX45DF29I5

• 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
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Number Of Gates: -

4–20
Figure 4–13. Two-Multiplier Adder Mode Shown for Half-DSP Block
Notes to
(1) In a half-DSP block, you can implement 2 two-multiplier adders.
(2) Block output for accumulator overflow and saturate overflow.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
Figure
Two-Multiplier Adder Sum Mode
4–13:
datab_0[17..0]
dataa_0[17..0]
dataa_1[17..0]
datab_1[17..0]
clock[3..0]
In the two-multiplier adder configuration, the DSP block can implement four 18-bit
two-multiplier adders (2 two-multiplier adders per half-DSP block). You can
configure the adders to take the sum or difference of two multiplier outputs.
Summation or subtraction must be selected at compile time. The two-multiplier adder
function is useful for applications such as FFTs, complex FIR, and IIR filters.
Figure 4–13
The loopback mode is a sub-feature of the two-multiplier adder mode.
shows the DSP block configured in the loopback mode. This mode takes the 36-bit
summation result of the two multipliers and feeds back the most significant 18-bits to
the input. The lower 18-bits are discarded. You have the option to disable or zero-out
the loopback data with the dynamic zero_loopback signal. A logic 1 value on the
zero_loopback signal selects the zeroed data or disables the looped back data, and a
logic 0 selects the looped back data.
ena[3..0]
aclr[3..0]
Half-DSP Block
shows the DSP block configured in the two-multiplier adder mode.
output_saturate
output_round
signa
signb
+
(Note 1)
Chapter 4: DSP Blocks in Arria II Devices
overflow (2)
Arria II Operational Mode Descriptions
December 2010 Altera Corporation
result[ ]
Figure 4–14