[Die Supply Pads] Walter Katz Signal Integrity Software, Inc. IBIS Interconnect January 6, 2016

Overview Signal_names_are_bus_labels option in [Pin Mapping] Proposed [Die Supply Pads] Section in IBIS I/O Pin bus_labels in [Pin Mapping] IBIS signal_name and bus_label Rules IBIS Check signal_name and bus_label Logic 2

Signal_names_are_bus_labels Option in [Pin Mapping] Was Bus_label_signal_name Clarified Logic –POWER or GND pins (Model_name is POWER or GND) will by default have a bus_label equal to its signal_name –POWER or GND pins may have bus_labels that are not their signal name. 3

Keyword:[Die Supply Pads] Required:No Description:Associates signal_names and bus_labels to die supply pads. Sub-Params:None Usage Rules: Only die pads with signal_names that occur on POWER or GND pins are allowed. All die supply pads in a component need to be specified. Each line must contain either two or three columns. The first column must contain the die supply pad name. The second column, signal_name, gives the data book name for the signal. The third column is optional. If it exists it is a bus_label. If the third column does not exist, then the bus_label shall be the signal_name. Other Notes:The data in this section consists of a list of die pad node names and their corresponding Signal_names or bus_label that can be used to mate package and on-die Power Delivery Networks. Example: [Die Supply Pads] signal_name bus_labelVDDQ VDD1 VDD VDDa VDD2 VDD VDDa VDD3 VDD VDDb VSS1 VSS VSS2 VSS 4 Proposed [Die Supply Pads] Section in IBIS

I/O Pin bus_labels in [Pin Mapping] I/O pins’ pulldown_ref pullup_ref gnd_clamp_ref power_clamp_ref ext_ref fields will be bus_labels that are either –POWER or GND pin signal_names –POWER or GND bus_labels –Die Pad signal_names –Die Pad bus_lables. 5

IBIS signal_name and bus_label Rules If two pins have the same signal_name they must have the same model_name If two pins or die pads have the same bus_label they must have the same signal_name A bus_label on an I/O pin pullup_ref and power_clamp_ref bus_labels must be associated with a POWER signal_name. A bus_label on an I/O pin pulldown_ref and gnd_clamp_ref bus_labels must be associated with a GND signal_name. A bus_label on an I/O pin ext_ref bus_labels must be associated with a POWER or GND signal_name. A bus_label on an I/O pin pullup_ref, power_clamp_ref, pulldown_ref, gnd_clamp_ref or ext_ref bus_labels must be associated with a POWER or GND signal_name. 6

IBIS Check signal_name and bus_label Logic Make a list of all unique bus_labels on POWER and GND pins and [Die Supply Pad]. This list shall include the signal_name on POWER and GND pins that are not in [Pin Mapping] Make a list of all unique POWER and GND pin signal_names –For each unique POWER and GND pin signal_name make a list of all pins on that signal name –Verify that all of the pins for each signal_name are all POWER or all GND For each bus_label, make a list of all supply pins that have that bus_label and a list of all [Die Supply Pads] that have that bus_label. Verify that all of the pins and die supply pads in these two lists have the same signal_name For each I/O pin that is in [Pin Mapping] –pullup_ref and power_clamp_ref bus_labels Must exist in the list of unique bus_labels The signal name associated with the bus_labels must all be a POWER signal_name –pulldown_ref and gnd_clamp_ref bus_labels Must exist in the list of unique bus_labels The signal name associated with these bus_labels must all be a GND signal_name –ext_ref bus_labels Must exist in the list of unique bus_labels –pullup_ref, power_clamp_ref, pulldown_ref, gnd_clamp_ref and ext_ref bus_labels Must exist in the list of unique bus_labels 7