EP2AGX65DF29I5N Altera, EP2AGX65DF29I5N Datasheet - Page 96

• Manufacturer Part Number: EP2AGX65DF29I5N
• Description: IC ARRIA II GX FPGA 65K 780FBGA
• Manufacturer: Altera
• Series: Arria II GXr

Specifications of EP2AGX65DF29I5N

• Number Of Logic Elements/cells: 60214
• Number Of Labs/clbs: 2530
• Total Ram Bits: 5246
• 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: Lead free / RoHS Compliant
• Number Of Gates: -

4–24
Figure 4–17. High-Precision Multiplier Adder Configuration for Half-DSP Block
Note to
(1) Block output for accumulator overflow and saturate overflow.
Arria II Device Handbook Volume 1: Device Interfaces and Integration
Figure
High-Precision Multiplier Adder Mode
4–17:
dataA[0:17]
dataB[0:17]
dataA[0:17]
dataB[18:35]
dataC[0:17]
dataD[0:17]
dataC[0:17]
dataD[18:35]
In the high-precision multiplier adder, the DSP block can implement 2 two-multiplier
adders, with a multiplier precision of 18 × 36 (one two-multiplier adder per half-DSP
block). This mode is useful in filtering or FFT applications where a datapath greater
than 18 bits is required, yet 18 bits is sufficient for coefficient precision. This can occur
if data has a high dynamic range. If the coefficients are fixed, as in FFT and most filter
applications, the precision of 18 bits provides a dynamic range over 100 dB, if the
largest coefficient is normalized to the maximum 18-bit representation.
In these situations, the datapath can be up to 36 bits, allowing sufficient capacity for
bit growth or gain changes in the signal source without loss of precision, which is
useful in single precision block floating point applications.
high-precision multiplier is performed in two stages. The sum of the results of the two
adders produce the final result:
Z[54..0] = P
where P
0
= A[17..0] × B[35..0] and P
Half-DSP Block
clock[3..0]
0
ena[3..0]
aclr[3..0]
[53..0] + P
1
<<18
<<18
[53..0]
+
+
P
P
0
1
signa
signb
1
= C[17..0] × D[35..0]
+
Chapter 4: DSP Blocks in Arria II Devices
overflow (1)
Arria II Operational Mode Descriptions
Figure 4–17
December 2010 Altera Corporation
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shows the