Simulink®

Hardware Implementation Pane

Hardware Implementation Overview

Describe the hardware characteristics for the modelled system, including how to set up embedded and emulation hardware settings for both simulation and code generation.

Note   Hardware Implementation pane options do not control hardware or compiler behavior: their purpose is to solely describe hardware and compiler properties to MATLAB® software, which uses the information to generate code that is correct for the platform, runs as efficiently as possible, and gives bit-true agreement among simulation results, production code, and test code.

Configuration

1. Choose the Device type in the Embedded hardware subpane.

2. Set the parameters displayed for the selected device type.

3. Apply the changes.

4. Repeat as needed for Emulation hardware.

Tips

• This pane applies to models of computer-based systems, such as embedded controllers.

• Specifying hardware characteristics enables simulation of the model to detect error conditions that could arise when executing code, such as hardware overflow.

See Also

• Configuring Hardware Properties

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Device vendor

Select the manufacturer of the hardware you will use to implement the production version of the system represented by this model.

Settings

Default: Generic

• AMD

• ARM Compatible

• ASIC/FPGA

• Analog Devices

• Atmel

• Freescale

• Infineon

• Intel

• Microchip

• NEC

• Renesas

• SGI

• STMicroelectronics

• Texas Instruments

• Generic

Tips

• Select the device vendor before you specify the hardware device used to define your system's constraints.

• If your test hardware does not match any of the listed vendors, select Generic.

• The Device vendor and Device type fields both share the same command line parameter: ProdHWDeviceType. When specifying this parameter from the command line, separate the device vendor and device type values using the characters —>. For example: 'Intel->8051 Compatible'.

• To add Device vendor and Device type values to the default set that is displayed on the Hardware Implementation pane, see Registering Additional Device Vendor and Device Type Values in the Real-Time Workshop^® documentation.

Dependencies

This parameter determines the options available in the Device type drop-down menu.

Command-Line Information

Recommended Settings

See Also

• Device type (production hardware)

• Device vendor (test hardware)

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Device type

Select the type of hardware you will use to implement the production version of the system represented by this model.

Settings

Default: Unspecified (assume 32–bit Generic)

Generic options:

• 16-bit Embedded Processor

• 32-bit Embedded Processor

• 32-bit Real-Time Simulator

• 32-bit x-86 compatible

• 8-bit Embedded Processor

• Custom

• Unspecified (assume 32-bit Generic)

AMD^® options:

• K5/K6/Athlon

ARM^® Compatible options:

• ARM 7

• ARM 8

• ARM 9

ASIC/FPGA options:

• ASIC/FPGA

Analog Devices™ options:

• Blackfin

• SHARC

• TigerSHARC

Atmel^® options:

• AVR

Freescale™ options:

• 32-bit PowerPC

• 68332

• 68HC08

• 68HC11

• ColdFire

• DSP563xx (16-bit mode)

• HC(S)12

• MPC5500

Infineon^® options:

• C16x, XC16x

• TriCore

Intel^® options:

• 8051 Compatible

• x86/Pentium

Microchip:

• PIC18

• dsPIC

NEC^® options:

• V850

Renesas^® options:

• M16C

• M32C

• R8C/Tiny

• SH-2/3/4

SGI:

• UltraSPARC IIi

STMicroelectronics:

• ST10/Super10

Texas Instruments™ options:

• C2000

• C5000

• C6000

• MSP430

Tips

• Select the device vendor before you specify the hardware device type.

• Selecting a device type specifies the hardware device to define your system's constraints:

  • Default hardware properties appear as the initial values.

  • Parameters with only one possible value cannot be changed.

  • Parameters with more than one possible value provide a pulldown list of legal values.

  • Static values for each device type are displayed in the following table.

  • Parameters that you can modify are identified with an x.

  Key:	Word size = native word size
  	Rounds to = Signed integer division rounds to
  	Shift right = Shift right on a signed integer as arithmetic shift
  Device vendor / Device type	Number of bits					Byte ordering	Rounds to	Shift right
  	char	short	int	long	Word size
  Generic
  Unspecified (assume 32-bit Generic) (default)	8	16	32	32	32	Un- specified	x	Set
  Custom	x	x	x	x	x	x	x	x
  16-bit Embedded Processor	8	16	16	32	16	x	x	Set
  32-bit Embedded Processor	8	16	32	32	32	x	x	Set
  32-bit Real Time Simulator	8	16	32	32	32	x	x	Set
  32-bit x86 compatible	8	16	32	32	32	Little Endian	Zero	Set
  8-bit Embedded Processor	8	16	16	32	8	x	x	Set
  AMD
  K5/K6/Athlon	8	16	32	32	32	Little Endian	x	Set
  ARM Compatible
  ARM 7/8/9	8	16	32	32	x	x	x	x
  ASIC/FPGA
  ASIC/FPGA	NA	NA	NA	NA	NA	NA	NA	NA
  Analog Devices
  Blackfin	8	16	32	32	32	Little Endian	Zero	Set
  SHARC	32	32	32	32	32	Big Endian	Zero	Set
  TigerSHARC	32	32	32	32	32	Little Endian	Zero	Set
  Atmel
  AVR	8	16	16	32	8	Little Endian	Zero	Set
  Freescale
  32-bit PowerPC	8	16	32	32	32	Big Endian	Zero	Set
  68332	8	16	32	32	32	Big Endian	x	Set
  68HC08	8	16	16	32	8	Big Endian	x	Set
  68HC11	8	16	16	32	8	Big Endian	x	Set
  ColdFire	8	16	32	32	32	Big Endian	Zero	Set
  DSP563xx (16-bit mode)	8	16	16	32	16	x	x	Set
  HC(S)12	8	16	16	32	16	Big Endian	x	Set
  MPC5500	8	16	32	32	32	x	Zero	Set
  Infineon
  C16x, XC16x	8	16	16	32	16	Little Endian	Zero	Set
  TriCore	8	16	32	32	32	Little Endian	x	Set
  Intel
  8051 Compatible	8	16	16	32	8	x	x	Clear
  xPC/Pentium	8	16	32	32	32	Little Endian	x	Set
  Microchip
  PIC18	8	16	16	32	8	Little Endian	Zero	Set
  dsPIC	8	16	16	32	16	Little Endian	Zero	Set
  NEC
  V850	8	16	32	32	32	x	x	x
  Renesas
  M16C	8	16	16	32	16	Little Endian	x	x
  M32C	8	16	x	32	x	Little Endian	x	x
  R8C/Tiny	8	16	16	32	16	Little Endian	x	x
  SH-2/3/4	8	16	32	32	32	x	x	x
  SGI
  UltraSPARC IIi	8	16	32	32	32	Big Endian	x	Set
  STMicroelectronics
  ST10/Super10	8	16	16	32	16	Little Endian	Zero	Set
  Texas Instruments
  C2000	16	16	16	32	16	x	Zero	Set
  C5000	16	16	16	32	16	Big Endian	Zero	Set
  C6000	8	16	32	40	32	x	Zero	Set

• If your production hardware does not match any of the listed types, select Unspecified (assume 32-bit Generic) if it has the characteristics of a generic 32-bit microprocessor; otherwise select Custom.

• The Device vendor and Device type fields both share the same command line parameter: TargetHWDeviceType. When specifying this parameter from the command line, separate the device vendor and device type values using the characters —>. For example: 'Intel->8051 Compatible'.

• To add Device vendor and Device type values to the default set that is displayed on the Hardware Implementation pane, see Registering Additional Device Vendor and Device Type Values in the Real-Time Workshop documentation.

Dependencies

The options available in the drop-down menu are determined by the Device vendor parameter.

Selecting ASIC/FPGA enables the Emulation hardware (code generation only) subpane.

For all other device types, this parameter sets:

• char

• short

• int

• long

• native word size

• Byte ordering

• Signed integer division rounds to

• Shift right on a signed integer as arithmetic shift

Command-Line Information

Recommended Settings

See Also

• Device vendor (production hardware)

• Device type (test hardware)

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: char

Describe the character bit length for the production hardware.

Settings

Default: 8

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink^® software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: short

Describe the data bit length for the production hardware.

Settings

Default: 16

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: int

Describe the data integer bit length for the production hardware.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a number between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: long

Describe the data bit lengths for the production hardware.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: native word size

Describe the microprocessor native word size for the production hardware.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Byte ordering

Describe the byte ordering for the production hardware.

Settings

Default: Unspecified

Unspecified

Specifies that the code determines the endianness of the hardware. This is the least efficient choice.

Big Endian

The most significant byte appears first.

Little Endian

The least significant byte appears first.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Signed integer division rounds to

Describe how to produce a signed integer quotient for the production hardware.

Settings

Default: Undefined

Undefined

Choose this option if neither Zero nor Floor describes the compiler's behavior, or if that behavior is unknown.

Zero

If the quotient is between two integers, the compiler chooses the integer that is closer to zero as the result.

Floor

If the quotient is between two integers, the compiler chooses the integer that is closer to negative infinity.

Tips

• Use the Round integer calculations toward parameter on your model's blocks to simulate the rounding behavior of the C compiler that you intend to use to compile code generated from the model. This setting appears on the Signal Data Type pane of the parameter dialog boxes of blocks that can perform signed integer arithmetic.

• For most blocks, the value of Round integer calculations toward completely defines rounding behavior. For blocks that support fixed-point data and the Simplest rounding mode, the value of Signed integer division rounds to also affects rounding. For details, see Rounding in the Simulink^® Fixed Point™ User's Guide.

• See Hardware Implementation Options in the Real-Time Workshop documentation for information on how this option affects code generation.

• The following table illustrates the compiler behavior described by the options for this parameter.

  N	D	Ideal N/D	Zero	Floor	Undefined
  33	4	8.25	8	8	8
  -33	4	-8.25	-8	-9	-8 or -9
  33	-4	-8.25	-8	-9	-8 or -9
  -33	-4	8.25	8	8	8

Dependency

This parameter is enabled by Device type.

Command-Line Information

Recommended settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Shift right on a signed integer as arithmetic shift

Describe how your compiler rounds the result of two signed integers for the production hardware.

Settings

Default: On

On

Generates simple efficient code whenever the Simulink model performs arithmetic shifts on signed integers.

Off

Generates fully portable but less efficient code to implement right arithmetic shifts.

Tips

• Select this parameter if the C compiler implements a signed integer right shift as an arithmetic right shift.

• An arithmetic right shift fills bits vacated by the right shift with the value of the most significant bit, which indicates the sign of the number in twos complement notation.

Dependency

This parameter is enabled by Device type.

Command-Line Information

Recommended settings

See Also

• Hardware Implementation Options

• Specifying Embedded Hardware Characteristics

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

None

Specify whether the test hardware differs from the deployment hardware.

Settings

Default: On

On

Specifies that the hardware used to test the code generated from the model is the same as the production hardware, or has the same characteristics.

Off

Specifies that the hardware used to test the code generated from the model has different characteristics than the production hardware.

Tips

• You can generate code that runs on the test hardware but behaves as if it had been generated for and executed on the deployment hardware.

• The Embedded hardware (simulation and code generation) subpane specifies the deployment hardware properties. The Emulation hardware (code generation only) subpane is used to specify the test hardware properties.

Dependency

Enables the Emulation hardware subpane.

Command-Line Information

Recommended settings

More information

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Device vendor

Select the manufacturer of the hardware that will be used to test the code generated from the model.

Settings

Default: Generic

• AMD

• ARM Compatible

• ASIC/FPGA

• Analog Devices

• Atmel

• Freescale

• Infineon

• Intel

• Microchip

• NEC

• Renesas

• SGI

• STMicroelectronics

• Texas Instruments

• Generic

Tips

• Select the device vendor before you specify the hardware device used to define your system's constraints.

• If your test hardware does not match any of the listed vendors, select Generic.

• The Device vendor and Device type fields both share the same command line parameter: TargetHWDeviceType. When specifying this parameter from the command line, separate the device vendor and device type values using the characters —>. For example: 'Intel->8051 Compatible'.

Dependencies

This parameter determines the options available in the Device type drop-down menu.

Command-Line Information

Recommended Settings

See Also

• Device type (test hardware)

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Device type

Select the type of hardware that will be used to test the code generated from the model.

Settings

Default: Unspecified (assume 32–bit Generic)

Generic options:

• 16-bit Embedded Processor

• 32-bit Embedded Processor

• 32-bit Real-Time Simulator

• 32-bit x-86 compatible

• 8-bit Embedded Processor

• Custom

• MATLAB Host Computer

• Unspecified (assume 32-bit Generic)

AMD options:

• K5/K6/Athlon

ARM Compatible options:

• ARM 7

• ARM 8

• ARM 9

Analog Devices options:

• Blackfin

• SHARC

• TigerSHARC

Atmel options:

• AVR

Freescale options:

• 32-bit PowerPC

• 68332

• 68HC08

• 68HC11

• ColdFire

• DSP563xx (16-bit mode)

• HC(S)12

• MPC5500

Infineon options:

• C16x, XC16x

• TriCore

Intel options:

• 8051 Compatible

• x86/Pentium

Microchip:

• PIC18

• dsPIC

NEC options:

• V850

Renesas options:

• M16C

• R8C/Tiny

• SH-2/3/4

SGI:

• UltraSPARC IIi

STMicroelectronics:

• ST10/Super10

Texas Instruments options:

• C2000

• C5000

• C6000

• MSP430

Tips

• Select the device vendor before you specify the hardware device type.

• Selecting a device type specifies the hardware device to define your system's constraints:

  • Default hardware properties appear as the initial values.

  • Parameters with only one possible value cannot be changed.

  • Parameters with more than one possible value provide a pulldown list of legal values.

  • Static values for each device type are displayed in the following table. Parameters that you can modify are identified with an x.

  Key:	Word size = native word size
  	Rounds to = Signed integer division rounds to
  	Shift right = Shift right on a signed integer as arithmetic shift
  Device vendor / Device type	Number of bits					Byte ordering	Rounds to	Shift right
  	char	short	int	long	Word size
  Generic
  Unspecified (assume 32-bit Generic) (default)	8	16	32	32	32	Un- specified	x	Set
  Custom	x	x	x	x	x	x	x	x
  16-bit Embedded Processor	8	16	16	32	16	x	x	Set
  32-bit Embedded Processor	8	16	32	32	32	x	x	Set
  32-bit Real Time Simulator	8	16	32	32	32	x	x	Set
  32-bit x86 compatible	8	16	32	32	32	Little Endian	Zero	Set
  8-bit Embedded Processor	8	16	16	32	8	x	x	Set
  MATLAB Host Computer	8	16	32	32	32	Little Endian	x	Set
  AMD
  K5/K6/Athlon	8	16	32	32	32	Little Endian	x	Set
  ARM Compatible
  ARM 7/8/9	8	16	32	32	x	x	x	x
  ASIC/FPGA
  ASIC/FPGA	NA	NA	NA	NA	NA	NA	NA	NA
  Analog Devices
  Blackfin	8	16	32	32	32	Little Endian	Zero	Set
  SHARC	32	32	32	32	32	Big Endian	Zero	Set
  TigerSHARC	32	32	32	32	32	Little Endian	Zero	Set
  Atmel
  AVR	8	16	16	32	8	Little Endian	Zero	Set
  Freescale
  32-bit PowerPC	8	16	32	32	32	Big Endian	Zero	Set
  68332	8	16	32	32	32	Big Endian	x	Set
  68HC08	8	16	16	32	8	Big Endian	x	Set
  68HC11	8	16	16	32	8	Big Endian	x	Set
  ColdFire	8	16	32	32	32	Big Endian	Zero	Set
  DSP563xx (16-bit mode)	8	16	16	32	16	x	x	Set
  HC(S)12	8	16	16	32	16	Big Endian	x	Set
  MPC5500	8	16	32	32	32	x	Zero	Set
  Infineon
  C16x, XC16x	8	16	16	32	16	Little Endian	Zero	Set
  TriCore	8	16	32	32	32	Little Endian	x	Set
  Intel
  8051 Compatible	8	16	16	32	8	x	x	Clear
  xPC/Pentium	8	16	32	32	32	Little Endian	x	Set
  Microchip
  PIC18	8	16	16	32	8	Little Endian	Zero	Set
  dsPIC	8	16	16	32	16	Little Endian	Zero	Set
  NEC
  V850	8	16	32	32	32	x	x	x
  Renesas
  M16C	8	16	16	32	16	Little Endian	x	x
  M32C	8	16	x	32	x	Little Endian	x	x
  R8C/Tiny	8	16	16	32	16	Little Endian	x	x
  SH-2/3/4	8	16	32	32	32	x	x	x
  SGI
  UltraSPARC IIi	8	16	32	32	32	Big Endian	x	Set
  STMicroelectronics
  ST10/Super10	8	16	16	32	16	Little Endian	Zero	Set
  Texas Instruments
  C2000	16	16	16	32	16	x	Zero	Set
  C5000	16	16	16	32	16	Big Endian	Zero	Set
  C6000	8	16	32	40	32	x	Zero	Set

• If your production hardware does not match any of the listed types, select Unspecified (assume 32-bit Generic) if it has the characteristics of a generic 32-bit microprocessor; otherwise select Custom.

• The Device vendor and Device type fields both share the same command line parameter: TargetHWDeviceType. When specifying this parameter from the command line, separate the device vendor and device type values using the characters —>. For example: 'Intel->8051 Compatible'.

Dependencies

The options available in the drop-down menu are determined by the Device vendor parameter.

This parameter sets:

• char

• short

• int

• long

• native word size

• Byte ordering

• Signed integer division rounds to

• Shift right on a signed integer as arithmetic shift

Command-Line Information

Recommended Settings

See Also

• Device vendor (test hardware)

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: char

Describe the character bit length for the hardware used to test code.

Settings

Default: 8

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: short

Describe the data bit length for the hardware used to test code.

Settings

Default: 16

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: int

Describe the data integer bit length of the hardware used to test code.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a number between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: long

Describe the data bit lengths for the hardware used to test code.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Number of bits: native word size

Describe the microprocessor native word size for the hardware used to test code.

Settings

Default: 32

Minimum: 8

Maximum: 32

Enter a value between 8 and 32.

Tip

All values must be a multiple of 8.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Byte ordering

Describe the byte ordering for the hardware used to test code.

Settings

Default: Unspecified

Unspecified

Specifies that the code determines the endianness of the hardware. This is the least efficient choice.

Big Endian

The most significant byte comes first.

Little Endian

The least significant byte comes first.

Note   For guidelines to observe when configuring Embedded hardware controls for code generation, see Hardware Implementation Options in the Real-Time Workshop documentation.

Dependencies

• This parameter is enabled by Device type.

• Simulink software disables this control if it knows the data type lengths for the selected device type.

Command-Line Information

Recommended Settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Signed integer division rounds to

Describe how to produce a signed integer quotient for the hardware used to test code.

Settings

Default: Undefined

Undefined

Choose this option if neither Zero nor Floor describes the compiler's behavior, or if that behavior is unknown.

Zero

If the quotient is between two integers, the compiler chooses the integer that is closer to zero as the result.

Floor

If the quotient is between two integers, the compiler chooses the integer that is closer to negative infinity.

Tips

• Use the Round integer calculations toward parameter on your model's blocks to simulate the rounding behavior of the C compiler that you intend to use to compile code generated from the model. This setting appears on the Signal Data Type pane of the parameter dialog boxes of blocks that can perform signed integer arithmetic.

• For most blocks, the value of Round integer calculations toward completely defines rounding behavior. For blocks that support fixed-point data and the Simplest rounding mode, the value of Signed integer division rounds to also affects rounding. For details, see Rounding in the Simulink^® Fixed Point™ User's Guide.

• See Hardware Implementation Options in the Real-Time Workshop documentation for information on how this option affects code generation.

• The following table illustrates the compiler behavior described by the options for this parameter.

  N	D	Ideal N/D	Zero	Floor	Undefined
  33	4	8.25	8	8	8
  -33	4	-8.25	-8	-9	-8 or -9
  33	-4	-8.25	-8	-9	-8 or -9
  -33	-4	8.25	8	8	8

Dependency

This parameter is enabled by Device type.

Command-Line Information

Recommended settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

Back to Top

Shift right on a signed integer as arithmetic shift

Describe how your compiler rounds the result of two signed integers for the hardware used to test code.

Settings

Default: On

On

Generates simple efficient code whenever the Simulink model performs arithmetic shifts on signed integers.

Off

Generates fully portable but less efficient code to implement right arithmetic shifts.

Tips

• Select this parameter if your C compiler implements a signed integer right shift as an arithmetic right shift.

• An arithmetic right shift fills bits vacated by the right shift with the value of the most significant bit, which indicates the sign of the number in twos complement notation. It is equivalent to dividing the number by 2.

• This setting affects only code generation

Dependency

This parameter is enabled by Device type.

Command-Line Information

Recommended settings

See Also

• Specifying Emulation Hardware Characteristics

• Hardware Implementation Options

• Configuration Parameters Dialog Box

• Hardware Implementation Pane

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