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Nexxim Simulator >
Nexxim Component Models >
IBIS Buffer Elements >
Tristate ECL Buffer

Tristate ECL Buffer

Netlist Syntax

B_3STATE_ECLxxx nd_pu nd_out nd_in [nd_pc nd_gc]

+ file='file_name' model='model_name'

+ buffer=14|three_state_ecl

+ [typ=typ|min|max|fast|slow]

+ [power=on|off]

+ [interpol=1|2]

+ [nowarn]

+ [xv_pu=state_pu]

+ [ramp_fwf=2|1|0] [ramp_rwf=2|1|0]

+ [fwf_tune=fwf_tune_value] [rwf_tune=rwf_tune_value]

+ [c_com_pu=c_com_pu_fraction]

+ [c_com_pc=c_com_pc_fraction]

+ [c_com_gc=c_com_gc_fraction]

+ [pu_scal=pu_scal_value]

+ [pc_scal=pc_scal_value]

+ [gc_scal=gc_scal_value]

+ [rwf_scal=rwf_scal_value]

+ [fwf_scal=fwf_scal_value]

+ [spu_scal=spu_scal_value]

+ [rm_dly_rwf=rm_dly_rwf_value]

+ [rm_dly_fwf=rm_dly_fwf_value]

+ [rm_tail_rwf=rm_tail_rwf_value]

+ [rm_tail_rwf=rm_tail_fwf_value]

Node nd_pu is the pullup, nd_in is the logic input, nd_out is the output, nd_en is the enable. Node nd_pc is the power clamp, nd_gc is the ground clamp, when present.

**IBIS Tristate BufferInstance Parameters**
Parameter	Description	Units	Default
FILE	Name of IBIS file	None	None
MODEL	Name of model in IBIS file. The model type must match the instance type.	None	None
BUFFER	Code or token for buffer type. Must be 14 or three_state_ecl for the Tristate ECL Buffer type	None	None
TYP	Parameter range: typ=midrange of all values min=minimum of all values max=maximum of all values fast=maxima and minima selected to produce the fastest transitions. slow=maxima and minima selected to produce the slowest transitions. See TYP Parameter Effects for all IBIS Buffers for fast and slow settings.	None	typ
POWER	Power mode: on=PULLUP, POWER, and GND, as applicable, are connected internally. The circuit must not connect voltage sources to these terminals off=Circuit must provide voltages to these terminals	None	on
INTERPOL	Interpolation: 1=linear, 2=spline	None	1
NOWARN	When present, disable parser warnings	None	Warnings enabled
XV_PU	Name of node for pullup scaling factor output	None	None
RAMP_FWF	Falling waveform ramp specification: 0=ramp only, 1=single waveform in IBIS file, 2=double waveform in IBIS file	None	2
RAMP_RWF	Rising waveform ramp specification: 0=ramp only, 1=single waveform in IBIS file, 2=double waveform in IBIS file	None	2
FWF_TUNE	Falling waveform adjustment. Used only when RAMP_FWF=0 or 1. Waveform assumes device transitions from on to off in the fraction of the total transition time given by FWF_TUNE.	None	0.1
RWF_TUNE	Rising waveform adjustment. Used only when RAMP_RWF=0 or 1. Waveform assumes device transitions from off to on in the fraction of the total transition time given by RWF_TUNE.	None	0.1
C_COM_PC	Fraction of capacitance on power clamp vs. GC and PU, (value between 0 and 1). Capacitance fractions must sum to 1.0.	None	0
C_COM_GC	Fraction of capacitance on ground clamp vs. PC and PU (value between 0 and 1). Capacitance fractions must sum to 1.0.	None	1
C_COM_PU	Fraction of capacitance on pullup vs. GC and PC (value between 0 and 1). Capacitance fractions must sum to 1.0.	None	0
PC_SCAL	Scale factor for power clamp current drive strength applied to IBIS table values	None	1.0
GC_SCAL	Scale factor for ground clamp current drive strength applied to IBIS table values	None	1.0
PU_SCAL	Scale factor for pullup current drive strength applied to IBIS table values	None	1.0
FWF_SCAL	Scale factor applied to falling ramp transition time	None	1.0
RWF_SCAL	Scale factor applied to rising ramp transition time	None	1.0
SPU_SCAL	Scale factor for pullup current drive strength applied to IBIS table values Used only when POWER=OFF and the voltage difference between the pullup and pulldown nodes is not equal to the [Voltage Range] value in the IBIS file.	None	1.0
RM_DLY_RWF	Amount of time to trim off the front of the rising waveform, relative to time=0	Sec	0.0
RM_DLY_FWF	Amount of time to trim off the front of the falling waveform, relative to time=0	Sec	0.0
RM_TAIL_RWF	Amount of time to trim off the end of the rising waveform, relative to the time of the last point in the waveform	Sec	0.0
RM_TAIL_FWF	Amount of time to trim off the end of the falling waveform, relative to the time of the last point in the waveform	Sec	0.0

Notes

[1] If any of the parameters RM_DLY_RWF, RM_DLY_FWF, RM_TAIL_RWF, or RM_TAIL_FWF is given a negative value, Nexxim sets the value to 0.0 with a warning.

[2] If the values of RM_DLY_RWF and RM_DLY_FWF are not equal, Nexxim generates a warning, since the unequal values alter the duty cycle of the output waveform relative to what is specified by the IBIS file itself. The simulation will run.

[3] If the value of RM_DLY_RWF, RM_DLY_FWF, RM_TAIL_RWF, or RM_TAIL_FWF is such that more than 10 percent of the original voltage transition is trimmed off, Nexxim generates a warning, but the simulation will run.

[4] If the values of RM_DLY_RWF and RM_TAIL_RWF are such that fewer than three (3) data points are left in the resulting waveform, Nexxim ignores the settings and issues a warning. With fewer than three data points, ramp transitions may give better results.

[5] If the values of RM_DLY_FWF and RM_TAIL_FWF are such that fewer than three (3) data points are left in the resulting waveform, Nexxim ignores the settings and issues a warning. With fewer than three data points, ramp transitions may give better results.

[6] If the sum of RM_DLY_RWF and RM_TAIL_RWF is such that the entire rising waveform is removed, Nexxim halts with an error.

[7] If the sum of RM_DLY_FWF and RM_TAIL_FWF is such that the entire falling waveform is removed, Nexxim halts with an error.

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