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Ansoft Designer / Ansys Designer 在线帮助文档：

System Simulator >
System Component Models >
Fixed-Point >
   Fixed-Point Real Scaler (FXTRSCALE)       

Fixed-Point Real Scaler (FXTRSCALE)

 

 


Property

Description

Units

Default

Range/type

useInAsOut

Use the input precision as the output precision: 1 for use, 0 for not use

None

1

[0, 1]/Integer

coefW

Word length of fixed point coefficient

None

32

[1, 32]/Integer

coefD

Precision of the fixed point coefficient

None

0

[0, 32]/Integer

outW

Word length of the output fixed point number

None

32

[1, 32]/Integer

outD

Precision of the output fixed point number

None

0

[0, 32]/Integer

ovf

Overflow characteristic:

0 for wrapped,

1 for saturate,

2 for zero saturate

None

0

[0, 2]/Integer

quant

Quantization characteristic:

0 for truncated,

1 for rounded,

2 for truncated 0

None

0

[0, 2]/Integer

gain

Gain of the scaler

None

1

(Inf, -Inf)/Real

ArithType

Arithmetic type: 0 for signed, 1 for unsigned

None

0

[0, 1]/Integer

Rin

Input impedance

Ohm

Inf

(0, Inf]/Real

Rout

Output impedance

Ohm

0

[0, Inf)/Real

Ports

Input

Input signal (fixed point real number)

Output

Output signal (floating point real number)

 

Limits

outW > outD, coefW > coefD for signed arithmetic

Notes

1. This model produces the result of the multiplication of the input signal with the coefficient. The coefficient is a fixed-point number converted from the parameter value “gain” according to the user defined format coefW, coefD, ovf, quant, arithtype. The fixed point output signal format is the same as the input signal format when the parameter useInAsOut is set to be 0, in which case outW, outD, ovf, quant and arithtype ignored. Otherwise, the output format is set by outW, outD, ovf, quant and arithtype.

2. The following plot shows the relationship between word length and precision.

Netlist Form

FXTRSCALE:NAME n1 n2 [useInAsOut=val] [coefW=val] [coefD=val] [outW=val] [outD=val] [ovf=val] [quant=val] gain=val [arithtype=val] [Rin=val] [Rout=val]

Netlist Example

FXTRSCALE:1 1 2 useInAsOut=0 coefW=16 coefD=4 outW=24 outD=8 ovf=1 quant=1 gain=2.34



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