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Concepts
Agilent 81250 Parallel Bit Error Ratio Tester, Programming Reference, March 2006
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Using Base w
Consider the following portion of import language code:
:statePar: { {B "0 x1")
:stateSet: B
:base: w
:vectorWidth: 5
:vectors:
{
001xx
}
Let us examine the :statePar: statement. A state set name B is
associated with the coding "0 x1". The order of the characters "0 x1" is
particularly important as it implies the underlying binary values.
Starting with 0, the coding assumes increasing order from left to right.
Each of the waveform characters represents a state. To represent
three waveform characters, two bits are required. With two bits there
are 4 binary values available. The value 01 must be represented by
'blank' because this is not a valid waveform character. Therefore, the
binary values of the states are: 0 = 00, 'blank'= 01, x = 10 and 1 = 11.
Enough information is now available to decode the vector: 001xx = 00
00 11 10 10
Coding
Memory Representation
0
00
'blank'
n/a
x
10
1
11
Coding
Memory Representation
0
0
1
1
Here is the same example using a hexadecimal base and the coding
"0 x1":
Segment Import and Export Language
#define state set B to have coding "0 x1"
#select State set B
#use waveform characters
#vector is 5 states wide
#this is the vector
Hardware Representation
0
n/a
Don't care
1
Hardware Representation
0
1
327
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