[IBIS-Users] series model

Hi experts,

I created an IBIS model for LVDS buffer, it can be enabled/disabled internal terminating resistor(100-ohm) by user

Could you tell me how to include this function in an IBIS file?

I edit the IBIS file as below(in red text):

[Pin] signal_name model_name R_pin L_pin C_pin

|

3 Anyp a_p

4 Anyn a_n

1 Vcc Power

2 GND GND

|

[Series Pin Mapping] pin_2 model_name function_table_group

3 4 terminate_diff 1

|

[Series Switch Groups]

| Function Group States

|On 1 /

Off 1 /

|*********************************************************************

|

[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max

|

3 4 NA NA NA NA

|

|*********************************************************************

[Model] terminate_diff

Model_type Series

|

| variable R(typ) R(min) R(max)

[R Series] 100ohm 99hm 101ohm

|

|*********************************************************************

When running a syntax and IBIS parser check, there are errors as below:

ERROR - Model terminate_diff: One of C_comp, C_comp_pullup, C_comp_pulldown, C_comp_power_clamp, C_comp_gnd_clamp must be defined

ERROR - Model 'terminate_diff': Pullup Reference Required when No Voltage Range is Specified

ERROR - Model 'terminate_diff': Pulldown Reference Required when No Voltage Range is Specified

ERROR - Model 'terminate_diff': POWER Clamp Reference Required when No Voltage Range is Specified

ERROR - Model 'terminate_diff': GND Clamp Reference Required when No Voltage Range is Specified

I wonder if the series model need this parameters?

If yes, what are the parameters?

Thanks

Yitong

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