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CL-PS7500FE-56QC-A Datasheet PDF : 251 Pages
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CL-PS7500FE
System-on-a-Chip for Internet Appliance
17. FPA COPROCESSOR MACROCELL ................................................................................156
17.1 FPA Functional Blocks....................................................................................................................157
17.1.1 Coprocessor Interface ....................................................................................................157
17.1.2 Instruction Issuer ............................................................................................................157
17.1.3 The Load-Store Unit .......................................................................................................157
17.1.4 The Register Bank ..........................................................................................................157
17.1.5 The Arithmetic Unit .........................................................................................................158
18. FLOATING-POINT COPROCESSOR PROGRAMMER’S MODEL ...................................160
18.1 Overview.........................................................................................................................................160
18.1.1 Floating-Point Status Register ........................................................................................160
18.1.2 Floating-Point Control Register.......................................................................................160
18.2 Floating-Point Operation.................................................................................................................160
18.3 ARM Integer and Floating-Point Number Formats .........................................................................161
18.3.1 Integer.............................................................................................................................161
18.3.2 IEEE Single Precision (S) ...............................................................................................161
18.3.3 IEEE Double Precision (D) .............................................................................................161
18.3.4 IEEE Extended Double Precision (E) .............................................................................162
18.3.5 Packed Decimal (P) ........................................................................................................163
18.3.6 Expanded Packed Decimal (EP).....................................................................................163
18.4 The Floating-Point Status Register (FPSR)....................................................................................164
18.4.1 System ID Byte ...............................................................................................................164
18.4.2 Exception Trap Enable Byte............................................................................................165
18.4.3 System Control Byte .......................................................................................................165
18.4.4 Cumulative Exception Flags Byte ...................................................................................166
18.5 The Floating-Point Control Register (FPCR) ..................................................................................168
19. FLOATING-POINT INSTRUCTION SET.............................................................................170
19.1 Coprocessor Data Transfer .............................................................................................................170
19.1.1 LDF/STF — Load and Store Floating .............................................................................170
19.1.2 Assembler Syntax...........................................................................................................171
19.1.3 Load and Store Multiple Floating Instructions ................................................................172
19.1.4 Assembler Syntax — Form 1..........................................................................................173
19.1.5 Assembler Syntax — Form 2..........................................................................................174
19.2 Coprocessor Data Operations ........................................................................................................174
19.2.1 Dyadic Operations ..........................................................................................................174
19.2.2 Monadic Operations........................................................................................................175
19.2.3 Library Calls....................................................................................................................175
19.2.4 Backwards Compatibility.................................................................................................175
19.3 Coprocessor Register Transfer .......................................................................................................178
19.3.1 Compare Operations ......................................................................................................179
19.4 FPA Instruction Set ........................................................................................................................180
19.4.1 Infinities and NaNs..........................................................................................................180
19.4.2 Exceptional Conditions ...................................................................................................180
19.5 Floating-point Support Code ..........................................................................................................182
19.5.1 IEEE Standard Conformance .........................................................................................182
19.6 Instruction Cycle Timing .................................................................................................................183
19.6.1 Instruction Classification .................................................................................................184
19.6.2 Performance Tuning ........................................................................................................185
June 1997
ADVANCE DATA BOOK v2.0
9
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