IQmath Library
IQmath Library
IQmath Library
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IQNisqrt<br />
Fixed point Inverse Square-root<br />
Description<br />
This module computes the inverse square root of the input using table<br />
lookup and Newton-Raphson approximation.<br />
input<br />
IQNisqrt<br />
output<br />
Availability<br />
C-Callable Assembly (CcA)<br />
Module Properties<br />
Type: Target Independent, Application Independent<br />
Target Devices: x28xx<br />
C/CPP Interface Files: <strong>IQmath</strong>Lib.h, <strong>IQmath</strong>CPP.h & <strong>IQmath</strong>.lib<br />
Item C-Callable ASM Comments<br />
Code Size<br />
69 words<br />
Data RAM<br />
0 words<br />
Multiple instances N/A<br />
Reentrancy Yes<br />
Multiple Invocation Yes<br />
Stack usage 2 words Stack grows by 2 words<br />
31<br />
Accuracy = log ( 2 ) 20log ( 5)<br />
20<br />
2<br />
−<br />
2<br />
=29 bits<br />
©Texas Instruments Inc., June 2002 57
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