Supported Operational Modes In Intel Agilex Devices; Fixed-Point Arithmetic - Intel Agilex User Manual

® ™
1. Intel Agilex Variable Precision DSP Blocks Overview
UG-20213 | 2019.04.02
• Sequential vector dot product
• Exception handling support using exception flags:-
— 8-bit exception flags for 32-bit arithmetic
— 16-bit exception flags for 16-bit arithmetic
• Subnormal values handling
Related Information
Intel Agilex Device Data Sheet—DSP Block Specifications
Refer to the Intel Agilex Device Data Sheet for more information on the DSP block
performance.

1.2. Supported Operational Modes in Intel Agilex Devices

1.2.1. Fixed-Point Arithmetic

Table 1. Supported Combinations of Operational Modes and Features
Variable- Operation Mode
Precision DSP
Block
Resource
1 variable Fixed-point
precision DSP independent 18 x 19
block multiplication
Fixed-point
independent 27 x 27
multiplication
Fixed-point two
18 x 19 multiplier
adder mode
Fixed-point 18 x 18
multiplier adder
summed with 36-bit
input
Fixed-point 18 x 19
systolic mode
Fixed-point four 9 x 9
multiplier adder mode
2 Variable Fixed-point complex
precision DSP 18x19 multiplication
blocks
(1) ®
The Intel Quartus
multiplication automatically when there are not enough DSP blocks on the device or within a
Logic Lock (Standard) region.
(2)
Each of the two inputs to a pre-adder has a maximum width of 18-bit. When the input cascade
is used to feed one of the pre-adder inputs, the maximum width for the input cascade is
18-bit.
(3)
When you enable the pre-adder feature, the input cascade support is not available.
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Supported
Operation
Instance
(1)
2
1
1
1
1
1
1
Prime software will determine the merging of two independent
Pre-Adder Coefficient
Support Support
Yes Yes
Yes Yes
Yes Yes
No No
Yes Yes
No No
No No
® ™
Intel Agilex Variable Precision DSP Blocks User Guide
Input Chainin/
Cascade Chainout
Support Support
(2)
Yes No
(3)
Yes Yes
(2)
Yes Yes
No Yes
(2)
Yes Yes
No Yes
(2)
Yes No
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