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14<h1 align="left">CP_IsSqrtBusy <img src="../../image/NTR.gif"align="middle"><img src="../../image/TWL.gif" align="middle"></H1>
15<H2>Syntax</H2>
16
17<dl>
18  <dd>
19<CODE>#include &lt;nitro/cp.h&gt;</CODE><BR>
20  <BR>
21  <CODE>s32 CP_IsSqrtBusy( void )</CODE></dd>
22</dl>
23
24<h2>Arguments</h2>
25<p>None.</p>
26
27<h2>Return Values</h2>
28<p>Determines whether square root calculator is busy. 0 means ready state and non-0 means busy state.</p>
29<H2>Description</H2>
30<P>Checks whether square root calculator is busy or not. After writing in a square root calculation register, it will be in a busy state for a fixed cycle period. When acquiring results of square root calculation, you need to read when it is no longer busy. The calculation cycle is as follows. (The calculation cycle is a cycle number based on 33.514 MHz. The CPU cycle conversion is a cycle number based on 67.028 MHz.))</P>
31<TABLE border="1">
32  <TBODY>
33    <TR>
34      <TH>Square Root Calculation Mode</TH>
35      <TH>Calculation</TH>
36      <TH>Calculation Cycles</TH>
37      <TH>CPU Cycle Conversion</TH>
38    </TR>
39    <TR>
40      <TD>CP_SQRT_32BIT_MODE</TD>
41      <TD>Square root calculation of 32-bit values</TD>
42      <TD>13 cycles</TD>
43      <TD>26 cycles</TD>
44    </TR>
45    <TR>
46      <TD>CP_SQRT_64BIT_MODE</TD>
47      <TD>Square root calculation of 64-bit values</TD>
48      <TD>13 cycles</TD>
49      <TD>26 cycles</TD>
50    </TR>
51  </TBODY>
52</TABLE>
53
54<h2>Internal Operation</h2>
55<p><CODE>Reference SQRTCNT(0x40002B0) of the IO register.<br></CODE></p>
56
57<h2>See Also</h2>
58<p><code><A href="CP_SetSqrtImm.html">CP_SetSqrtImm*</A></code>, <code><A href="CP_SetSqrt.html">CP_SetSqrt*</A></code>, <code><A href="CP_WaitSqrt.html">CP_WaitSqrt</A></code>, <code><A href="CP_GetSqrtResult.html">CP_GetSqrtResult*</A></code></p>
59
60<H2>Revision History</H2>
61<P>2004/11/02 Corrected the error in cycle numbers. Changed the function type in the C Specification from int to s32.<br> 2004/06/16 Added description of cycle number.<BR> 2004/01/09 Added contents.<BR> 2003/12/01 Initial version.</P>
62<hr><p>CONFIDENTIAL</p></body>
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