常见buffer类型
■ input buffer
b_input nd_pc nd_gc nd_in nd_out_of_in+ file='filename' model='model_name'+ [typ={typ|min|max|fast|slow}] [power={on|off}]+ [buffer={1|input}]+ [interpol={1|2}]+ [nowarn]+ [c_com_pc=c_com_pc_value]+ [c_com_gc=c_com_gc_value]+ [pc_scal=pc_scal_value]+ [gc_scal=gc_scal_value]
当power=on(default)时,pc/gc将会使用ibis model里面的电压值来连接电源,不需要额外再接电压源;反之,这需要外接电压源。
buffer测量并处理nd_in的电压值,并给nd_out_of_in发一个响应,上图中的v_out_of_in是一个数字信号,根据v_in(vinh/vinl/电压极性)来,有0/0.5/1三个值:
■ output buffer
b_output nd_pu nd_pd nd_out nd_in [nd_pc nd_gc]+ file='file_name' model='model_name'+ [typ={typ|min|max|fast|slow}] [power={on|off}]+ [buffer={2|output}]+ [xv_pu=state_pu] [xv_pd=state_pd]+ [interpol={1|2}]+ [ramp_fwf={0|1|2}] [ramp_rwf={0|1|2}]+ [fwf_tune=fwf_tune_value] [rwf_tune=rwf_tune_value]+ [nowarn]+ [c_com_pu=c_com_pu_value]+ [c_com_pd=c_com_pd_value]+ [c_com_pc=c_com_pc_value]+ [c_com_gc=c_com_gc_value]+ [pu_scal=pu_scal_value]+ [pd_scal=pd_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]+ [spd_scal=spd_scal_value]
■ tristate buffer
b_3state nd_pu nd_pd nd_out nd_in nd_en [nd_pc nd_gc]+ file='file_name' model='model_name'+ [typ={typ|min|max|fast|slow}] [power={on|off}]+ [buffer={4|three_state}]+ [xv_pu=state_pu] [xv_pd=state_pd]+ [interpol={1|2}]+ [ramp_fwf={2|1|0}] [ramp_rwf={2|1|0}]+ [fwf_tune=fwf_tune_value] [rwf_tune=rwf_tune_value]+ [nowarn]+ [c_com_pu=c_com_pu_value]+ [c_com_pd=c_com_pd_value]+ [c_com_pc=c_com_pc_value]+ [c_com_gc=c_com_gc_value]+ [pu_scal=pu_scal_value]+ [pd_scal=pd_scal_value]+ [pc_scal=pc_scal_value]+ [gc_scal=gc_scal_value]+ [rwf_scal=rwf_scal_value]+ [fwf_scal=fwf_scal_value]
■ input/output buffer
b_io nd_pu nd_pd nd_out nd_in nd_en nd_out_of_in [nd_pcnd_gc]+ file='file_name' model='model_name'+ [typ={typ|min|max|fast|slow}] [power={on|off}]+ [buffer={3|input_output}]+ [xv_pu=state_pu] [xv_pd=state_pd]+ [interpol={1|2}]+ [ramp_fwf={2|1|0}] [ramp_rwf={2|1|0}]+ [fwf_tune=fwf_tune_value] [rwf_tune=rwf_tune_value]+ [nowarn]+ [c_com_pu=c_com_pu_value]+ [c_com_pd=c_com_pd_value]+ [c_com_pc=c_com_pc_value]+ [c_com_gc=c_com_gc_value]+ [pu_scal=pu_scal_value]+ [pd_scal=pd_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]+ [spd_scal=spd_scal_value]
eg1:output driver buffer
b_out1 nd_pu nd_pd out1 in1+ file = 'at16245.ibs'+ model = 'at16245_out'eg2:使用ibis component
* instantiate an ibis component to see the logical nodes created.ibis ddr256+ file ='hyb256_400.ibs'+ component ='hyb25d256'.tran 1n 5n.option post probe dcstep=1.probe v(ddr*).end
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