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Digital Device Reference 125
Connection details:
Name Description Flow
Type
out
d
Output
out
Model format:
.MODEL model_name d_source parameters
Model parameters:
Name
Description
Type
Default Limits
input_file
Digital input vector filename
string none
none
out_family
Output logic family
string UNIV
none
out_res
Digital output resistance
real
100
0 - INF
out_res_pos
Digital O/P Res pos slope
real
out_res
0 - INF
out_res_neg
Digital O/P Res neg slope
real
out_res
0 - INF
min_sink
Minimum sink current
real
-0.001
none
max_source
Maximum source current
real
0.001
none
Device Operation
The digital signal source provides a multi bit arbitrary digital signal defined in a file.
File Format
The file is in ASCII format and is in the form of a table each row being on a new line.
The first column defines the time values while the entries in the remaining columns
define the output value for each of the outputs. So the total number of columns must be
the number of outputs plus one. The output values must appear in the same order as the
outputs in the netlist entry. So, the values for out_0 will be in column 2, out_1 in column
3 etc.
The file may include blank lines and comment lines beginning with a '*'.
The output values must specify the state as well as the strength using the following
codes:
Code
State-Strength
0S
LOW-STRONG
1S
HIGH-STRONG
US
UNKNOWN-STRONG
0R
LOW-RESISTIVE
1R
HIGH-RESISTIVE
UR
UNKNOWN-RESISTIVE
0Z
LOW-HI-Z
1Z
HIGH-HI-Z
UZ
UNKNOWN-HI-Z