Altera Floating-Point - Manual (Page 88)

Table 11-2: Truth Table for Inverse Square Root Operations
DATA[] SIGN BIT RESULT[] Zero Division_by_
zero
NaN
Normal 0 Normal 0 0 0
Normal 1 NaN 0 0 1
Denormal 0/1 Infinity 0 1 0
Zero 0/1 Infinity 0 1 0
Infinity 0/1 Zero 1 0 0
NaN X NaN 0 0 1
ALTFP_INV_SQRT Resource Utilization and Performance
This table lists the resource utilization and performance information for the ALTFP_INV_SQRT IP core.
The information was derived using the Quartus II software version 10.0.
Table 11-3: ALTFP_INV_SQRT Resource Utilization and Performance forStratix IV Devices
Device Family Precision
Output
Latency
Logic usage
f
MAX
(MHz)
Adaptive
Look-up
Tables
(ALUTs)
Dedicated
Logic
Registers
(DLRs)
Adaptive
Logic
Modules
(ALMs)
18-Bit DSP
Stratix IV
Single 26 502 658 430 22 413
Double 36 1,324 1,855 1,209 78 209
ALTFP_INV_SQRT Design Example: Inverse Square Root of Single-
Precision Format Numbers
This design example uses the ALTFP_INV_SQRT IP core to compute the inverse square root of single-
precision format numbers. This example uses the parameter editor GUI to define the core.
Related Information
• Floating-Point IP Cores Design Example Files on page 1-16
• Floating-Point IP Cores Design Examples
Provides the design example files for the Floating-Point IP cores
• ModelSim-Altera Software Support
Provides information about installation, usage, and troubleshooting
(5) Any denormal input is treated as a zero before going through the inverse process.
11-2 ALTFP_INV_SQRT Resource Utilization and Performance
UG-01058
2014.12.19
Altera Corporation ALTFP_INV_SQRT IP Core
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