This page describes configuration parameters that reside in the HDL Code Generation > Test Bench tab of the Configuration Parameters dialog box. Using the parameters in this tab, you can specify the floating-point tolerance strategy and the tolerance value.
When you map your design to the native floating-point libraries or the floating-point target libraries, specify the floating-point tolerance check option.
Default:
relative error
Select one of these options from the dropdown menu:
relative error: This is the default option.
When you verify the generated code by using HDL Testbench, HDL Coder™ checks for the floating-point tolerance of the native
floating-point library or the floating-point target library that your
design mapped to based on the relative error.
ulp error: When you verify the generated
code by using HDL Testbench, HDL Coder checks for the floating-point tolerance of the native
floating-point library or the floating-point target library that your
design mapped to based on the ULP error.
This option is disabled if you select the entire model. Select the DUT instead for Generate HDL for setting.
Property:
FPToleranceStrategy |
| Type: character vector |
Value:
'relative' | 'ULP' |
Default:
'relative' |
To set this property, use hdlset_param or makehdltb. To view the property
value, use hdlget_param.
For example, to specify the floating-point tolerance value for a model, use
the hdlset_param function to specify the tolerance
strategy, and then enter the tolerance value. For example, to check the
floating-point tolerance based on ULP error and enter the tolerance
value:
% Check for floating-point tolerance based on ULP hdlset_param('sfir_single', 'FPToleranceStrategy', 'ULP'); % When using ULP, optionally enter tolerance value >= 0 hdlset_param('FP_test_16a', 'FPToleranceValue', 1); % Generate HDL testbench with specified tolerance setting makehdltb('sfir_single/symmetric_fir')
Enter the tolerance value based on the floating-point tolerance check setting that you specify.
Default: 1e-07
The value must be a positive integer or a double data type.
The default tolerance value depends on the floating-point tolerance check setting that you specify. When you set the Floating point tolerance check based on to:
relative error, the default is a
Tolerance Value of
1e-07. When you use this floating-point tolerance
check setting, specify the tolerance value as a double data type.
You can specify a Tolerance Value, N, that is
less than or equal to 1e-07.
ulp error, the default is a
Tolerance Value of 0.
When you use this floating-point tolerance check setting, specify
the tolerance value as an integer. You can specify a
Tolerance Value, N, that is greater than or
equal to 0.
Property:
FPToleranceValue |
| Type: double | integer |
Default:
1e-07 |
To set this property, use hdlset_param or makehdltb. To view the property
value, use hdlget_param.
For example, to specify the floating-point tolerance value for a model, use
the hdlset_param function to specify the tolerance
strategy, and then enter the tolerance value. For example, to check the
floating-point tolerance based on ULP error and enter the tolerance
value:
% Check for floating-point tolerance based on ULP hdlset_param('sfir_single', 'FPToleranceStrategy', 'ULP'); % When using ULP, optionally enter tolerance value >= 0 hdlset_param('FP_test_16a', 'FPToleranceValue', 1); % Generate HDL testbench with specified tolerance setting makehdltb('sfir_single/symmetric_fir')