Motorola MVME197LE manual Floating Point Support, CPU/MPU Registers

Page 67

Floating Point Support

CPU/MPU Registers

MPU register CR20 is reserved for usage by the debugger. If CR20 is to be used by the user program, it must be restored prior to utilizing debugger resources (system calls).

Floating Point Support

4

The floating point Special Function Unit (SFU) of the MC88110 microprocessor

 

chip is supported in this version of 197Bug. For MVME197Bug, the commands

 

MD, MM, RM, and RS have been extended to allow display and modification

 

of floating point data in registers and in memory. Floating point instructions

 

can be assembled/disassembled with the DI option of the MD and MM

 

commands.

 

Valid data types that can be used when modifying a floating point data register or a floating point memory location:

 

 

Integer Data Types

 

12

 

Byte

 

 

 

 

 

 

 

1234

 

Half-Word

 

 

 

 

 

 

 

123455678

 

Word

 

 

 

 

 

 

Floating Point Data Types

 

 

 

1_FF_7FFFFF

 

Single Precision Real Format

 

 

 

1_7FF_FFFFFFFFFFFFF

 

Double Precision Real Format

 

 

 

-3.12345678901234501_E+123

 

Scientific Notation Format (decimal)

 

 

 

 

 

When entering data in single or double precision format, the following rules must be observed:

1.The sign field is the first field and is a binary field.

2.The exponent field is the second field and is a hexadecimal field.

3.The mantissa field is the last field and is a hexadecimal field.

4.The sign field, the exponent field, and at least the first digit of the mantissa field must be present (any unspecified digits in the mantissa field are set to zero).

5.Each field must be separated from adjacent fields by an underscore.

6.All the digit positions in the sign and exponent fields must be present.

MVME197LEIG/D1

4-7

Image 67
Contents MVME197LE Restricted Rights Legend Document Terminology PrefaceBIT Document Title Motorola Publication Number Related DocumentationPage Page Safety Summary Safety Depends on YOU Contents Hardware Preparation and Installation Using the 197Bug Debugger Appendix a Configure and Environment Commands List of Figures Xiv List of Tables Xvi Overview IntroductionRequirements Features Block Diagram SpecificationsMVME197LE Specifications Block Diagram Memory Array Bus Data Bus 256 BusSwitchMC88110 Address Data MUX Address Mezzanine Address BusFunctional Description Front Panel Switches and IndicatorsOnboard Dram Data Bus StructureMC88110 MPU Flash MemorySerial Port Interface Battery Backup RAM and ClockVMEbus Interface InterfacesEthernet Interface Printer InterfaceScsi Termination Scsi InterfacePeripheral Resources Processor Bus Memory Map ConnectorsMemory Maps Interrupt SourcesDramsize Processor Bus Memory MapLocal Devices Memory Map Address Range Devices Accessed Port SizeVMEbus Memory Map VMEbus Accesses to the Local Peripheral BusVMEbus Short I/O Memory Map Hardware Preparation Unpacking InstructionsHardware Preparation and Installation VMEbus Connector P1 Switch S1 Configuration SwitchesConfiguration Switch S1 General Information S1-1 to S1-8 OFF -- All Ones Factory Configuration Switch S6 Installation InstructionsMVME197LE Module Installation System Considerations MVME197LEIG/D1 Hardware Preparation and Installation Description of 197Bug Overview of M88000 FirmwareComparison With M68000-Based Firmware Installation and Start-up197Bug Implementation Ote Terminal to make sure XON/XOFF handshaking is enabledAutoboot Network Boot ROMbootRestarting the System ResetBreak AbortSYSFAIL* Assertion/Negation Memory RequirementsMPU Clock Speed Calculation DEL Terminal Input/Output ControlBlocks Versus Sectors Disk I/O SupportDevice Probe Function Disk I/O via 197Bug Commands Dskcfig Disk I/O via 197Bug System CallsDisk I/O Error Codes Default 197Bug Controller and Device ParametersNetwork I/O Support RARP/ARP Protocol Modules Bootp Protocol ModulePhysical Layer Manager Ethernet Driver UDP/IP Protocol ModulesMultiprocessor Control Register Mpcr Method Network Boot Control ModuleNetwork I/O Error Codes Multiprocessor SupportMpar Gcsr Method Diagnostic FacilitiesDebugger General Information Debugger Entering Debugger Command LinesExpression as a Parameter Syntactic VariablesData Type Base Identifier Examples Address Formats Address as a ParameterOffset Registers Port Numbers Entering and Debugging ProgramsHardware Functions Calling System Utilities From User ProgramsPreserving The Debugger Operating Environment 197Bug Vector Table and WorkspaceCPU/MPU Registers Floating Point SupportDouble Precision Real Single Precision RealScientific Notation Debugger Commands 197Bug Debugger Command SetNocm Noma Name Nioc RL Addrbhw Using the 197Bug Debugger Cnfg MI Configure Board Information BlockENV D Set Environment to Bug/Operating SystemENV Parameter and Options Default Meaning of Default Table A-1. ENV Command ParametersConfigure and Environment Commands Ffbffffc Table A-1. ENV Command Parameters Memory Requirement s 01FFFFFF Table A-1. ENV Command Parameters Efffffff FF7FFFFF Table A-1. ENV Command Parameters Table A-1. ENV Command Parameters Table A-1. ENV Command Parameters Disk/Tape Controller Modules Supported DISK/TAPE Controller DataMVME323 4 Devices Disk/Tape Controller Default ConfigurationsSingle Board Computers 7 Devices MVME320 4 DevicesMVME328 14 Devices MVME327A 9 DevicesMVME350 1 Device IOT Parameter IOT Command Parameters for Supported Floppy TypesDisk/Tape Controller Data Network Controller Modules Supported Network Controller DataNetwork Controller Data Numerics SymbolsIN-2 IN-3 Nvram A-2 XON/XOFF Index
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