NAME_TABLE:

C_Function_Name: cm_d_xor

Spice_Model_Name: d_xor

Description: "digital exclusive-or gate"

PORT_TABLE:

Port Name: in out

Description: "input" "output"

Direction: in out

Default_Type: d d

Allowed_Types: [d] [d]

Vector: yes no

Vector_Bounds: [2 -] -

Null_Allowed: no no

PARAMETER_TABLE:

Parameter_Name: rise_delay fall_delay

Description: "rise delay" "fall delay"

Data_Type: real real

Default_Value: 1.0e-9 1.0e-9

Limits: [1.0e-12 -] [1.0e-12 -]

Vector: no no

Vector_Bounds: - -

Null_Allowed: yes yes

PARAMETER_TABLE:

Parameter_Name: input_load

Description: "input load value (F)"

Data_Type: real

Default_Value: 1.0e-12

Limits: -

Vector: no

Vector_Bounds: -

Null_Allowed: yes

• Description:
  The digital xor gate is an n-input, single-output xor gate that produces an active `1' value if an odd number of its inputs are also `1' values. The delays associated with an output rise and those associated with an output fall may be specified independently.
  The model also posts an input load value (in farads) based on the parameter input load. The output of this model does not, however, respond to the total loading it sees on its output; it will always drive the output strongly with the specified delays. Note also that to maintain the technology-independence of the model, any UNKNOWN input, or any floating input causes the output to also go UNKNOWN.

Example SPICE Usage:

a9 [1 2] 8 xor3

.model xor3 d_xor(rise_delay = 0.5e-9 fall_delay = 0.3e-9

+ input_load = 0.5e-12)