43 lines
939 B
Plaintext
43 lines
939 B
Plaintext
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Example of string-valued parameters for XSPICE LUT
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.param and="0001" or="0111"
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* Simple AND gate via parameter.
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.model l_and d_lut table_values=and
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aand [ d1 d2 ] o_and l_and
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* More usefully, strings may be passed as sub-circuit parameters
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xor d1 d2 o_or pgate table=or
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.subckt pgate 1 2 out table="0000"
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.model poly d_lut table_values=table
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ap [ 1 2 ] out poly
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.ends
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* Strings can be concatenated by .param, but not in .subckt lines or instances.
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.param both=or{and}
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xboth d1 d2 d3 o_both pgate3 table=both
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.subckt pgate3 1 2 3 out table="00000000"
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.model poly3 d_lut table_values=table
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ap3 [ 1 2 3 ] out poly3
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.ends
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* Verify the above with a simple transient simulation.
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v1 a1 0 pulse 1 0 0 1n 1n 0.5u 1u
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v2 a2 0 pulse 1 0 0 1n 1n 1u 2u
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v3 a3 0 pulse 1 0 0 1n 1n 2u 4u
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aadc [ a1 a2 a3 ] [ d1 d2 d3 ] adc
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.model adc adc_bridge in_low=0.5 in_high=0.5
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.control
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tran 0.1u 4.1u
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plot d1 d2 d3 o_and o_or o_both digitop
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.endc
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.end
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