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IBIS Models Support in Eldo<br />

Buffers<br />

denote optional nodes. Pseudo-differential buffers are recognized as a separate buffer type by<br />

the IBIS standard and are constructed from two single-ended buffers. Therefore, pseudodifferential<br />

buffer nodes can be obtained from their single-ended version by replacing<br />

“a_signal” with “a_signal_pos” and “a_signal_neg”. PN is used to denote the power nodes,<br />

which are:<br />

• a_pcref - a_gcref for Input, Input_ECL, Terminator, and Input_diff buffers.<br />

• a_pcref - a_gcref - a_puref - a_pdref for other types.<br />

Table 17-2. Buffer Types and Port Names Used<br />

Type Number Nodes (in order) Min/Max<br />

Input 1 a_signal - [d_receive] - [PN] 1/4<br />

Output 2 a_signal - d_drive - [PN] 2/6<br />

I/O 3 a_signal - d_drive - d_enable - [d_receive] - [PN] 3/8<br />

3-state 4 a_signal - d_drive - d_enable - [PN] 3/7<br />

Open_drain 5 a_signal - d_drive - [PN] 2/6<br />

I/O_open_drain 8 a_signal - d_drive - d_enable - [d_receive] - [PN] 3/8<br />

Open_sink 7 a_signal - d_drive - [PN] 2/6<br />

I/O_open_sink 8 a_signal - d_drive - d_enable - [d_receive] - [PN] 3/8<br />

Open_source 9 a_signal - d_drive - [PN] 2/6<br />

I/O_open_source 10 a_signal - d_drive - d_enable - [d_receive] - [PN] 3/8<br />

Input_ECL 11 a_signal - [d_receive] - [PN] 1/4<br />

Output_ECL 12 a_signal - d_drive - [PN] 2/6<br />

I/O_ECL 13 a_signal - d_drive - d_enable - [d_receive] - [PN] 3/8<br />

3-state_ECL 14 a_signal - d_drive - d_enable - [PN] 3/7<br />

Series 15 a_pos - a_neg 2<br />

Series_switch 16 a_pos - a_neg - [d_switch] 2/3<br />

Terminator 17 a_signal - [PN] 1/3<br />

Input_diff 18 a_signal_pos - a_signal_neg - [d_receive] - [PN] 2/5<br />

Output_diff 19 a_signal_pos - a_signal_neg - d_drive - [PN] 3/7<br />

I/O_diff 20 a_signal_pos - a_signal_neg - d_drive - d_enable 4/9<br />

- [d_receive] [PN]<br />

3-state_diff 21 a_signal_pos - a_signal_neg - d_drive - d_enable<br />

- [PN]<br />

4/8<br />

734<br />

Eldo® User's Manual, 15.3

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