Numbers -2 – Altera Floating-Point User 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
•
Provides the design example files for the Floating-Point IP cores
•
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