Text item: Text_1
## DOES THIS BELONG HERE (FROM BOB'S BIRD 10.1x)? ############################
## When measuring the entries of the RLC matrices, either with laboratory
## equipment or field-solver software, currents are defined as ENTERING the pins
## of the package from the board (General Syntax Rule #10). The corresponding
## voltage drops are to be measured with the current pointing "in" to the "+"
## sign and "out" of the "-" sign.
##
## I1 +-----+ I2
## -----> | | <------
## board 0--------| Pkg |---------0 board
## + V1 - | | - V2 +
## +-----+
##
## It is important to observe this convention in order to get the correct signs
## for the mutual inductances and resistances.
################################################################################
$|------------------------------------------------------------------------------
$[Package Model] Package_Model_Name
$|
$|==============================================================================
$| Keyword: [Pin Mapping]
$| Required: No
$|Description: Used to indicate which power and ground buses a given driver,
$| receiver, or terminator is connected.
$| Sub-Params: pulldown_ref, pullup_ref, gnd_clamp_ref, power_clamp_ref
$|Usage Rules: Each power and ground bus is given a unique name which must
$| not exceed 15 characters. The first column contains a pin
$| number. Each pin number must match one of the pin numbers
$| declared previously in the [Pin] section of the IBIS file.
$| The second column, "pulldown_ref", designates the ground bus
$| connections for that pin. Here the term "ground bus" can
$| also mean another "power bus". The third column "pullup_ref"
$| designates the power bus connection. The forth and fifth
$| columns "gnd_clamp_ref" and "power_clamp_ref" contain
$| entries, if needed, to specify different ground bus
$| and power bus connections than those previously specified.
$|
$| If the [Pin Mapping] keyword is present, then the bus
$| connections for EVERY pin listed in the [Pin] section must
$| be given.
$|
$| Each line must contain either three or five columns. "NC"
$| is used for entries which are not needed or which follow
$| the conditions below:
$|
$| If a pin has no connection, then both the "pulldown_ref"
$| and "pullup_ref" entries for it will be NC.
$|
$| GND and POWER pin entries and buses are designated by
$| entries in either the "pulldown_ref" or "pullup_ref" columns.
$| There is no implied association to any column other than
$| through explicit designations in other pins.
$|
$| For any other type of pin, the "pulldown_ref" column contains
$| the power connection for the [Pulldown] table for non-ECL type
$| [Models]. This is also the power connection for the [GND Clamp]
$| table and the [Rgnd] model unless overridden by a specification
$| in the "gnd_clamp_ref" column.
$|
$| Also, the "pullup_ref" column contains the power connection
$| for the [Pullup] table and, for ECL type models, the [Pulldown]
$| table. This is also the power connection for the [POWER Clamp]
$| table and the [Rpower] model unless overridden by a
specification
$| in the "power_clamp_ref" column.
$|
$| Column length limits are:
$| [Pin Mapping] 5 characters max
$| pulldown_ref 15 characters max
$| pullup_ref 15 characters max
$| gnd_clamp_ref 15 characters max
$| power_clamp_ref 15 characters max
$|
$$| When 5 columns are used the headings "gnd_clamp_ref" and
$| "power_clamp_ref" must be used. Otherwise, these headings can
$| be omitted.
$|---------------------------------------------------------------------------
$[Pin Mapping] pulldown_ref pullup_ref gnd_clamp_ref power_clamp_ref
$|
$1 GNDBUS1 PWRBUS1 | Signal pins and their associated
$2 GNDBUS2 PWRBUS2 | ground and power connections
$3 GNDBUS1 PWRBUS1 GNDCLMP PWRCLAMP
$4 GNDBUS2 PWRBUS2 GNDCLMP PWRCLAMP
$5 GNDBUS2 PWRBUS2 NC PWRCLAMP
$6 GNDBUS2 PWRBUS2 GNDCLMP NC
$ | Some possible clamping connections
$| . | are shown above for illustration
$| . | purposes
$| .
$11 GNDBUS1 NC | One set of ground connections.
$12 GNDBUS1 NC | NC indicates no connection to
$13 GNDBUS1 NC | power bus.
$| .
$21 GNDBUS2 NC | Second set of ground connections
$22 GNDBUS2 NC
$23 GNDBUS2 NC
$| .
$31 NC PWRBUS1 | One set of power connections.
$32 NC PWRBUS1 | NC indicates no connection to
$33 NC PWRBUS1 | ground bus.
$| .
$41 NC PWRBUS2 | Second set of power connections
$42 NC PWRBUS2
$43 NC PWRBUS2
$| .
$51 GNDCLMP NC | Additional power connections
$52 NC PWRCLMP | for clamps
$|
$|==============================================================================
$| Keyword: [Diff Pin]
$| Required: No
$|Description: Associates differential pins, their differential
$| threshold voltages, and differential timing delays.
$| Sub-Params: inv_pin, vdiff, tdelay_typ, tdelay_min, tdelay_max
$|Usage Rules: Enter only differential pin pairs. The [Diff Pin] column
$| contains a non-inverting pin number and the inv_pin column
$| always contains the corresponding inverting pin number for
$| I/O output. The vdiff column contains the specified
$| output and differential threshold voltage between pins if
$| the pins are Input or I/O Model_types. For output only
$| differential pins, the vdiff entry is 0V. The tdelay columns
$| contain launch delays of the non-inverting pins relative to
$| the inverting pins. The values can be either polarity.
$|
$| If a pin is a differential input pin, the differential input
$| threshold (vdiff) overrides and supersedes the need for Vinh and
$| Vinl.
$|
$| If vdiff is not defined for a pin that is defined as requiring a
$| Vinh by its [Model] type. The parser issues a warning and
$| vdiff is set to the default value of 200mV.
$|
$|Other Notes: The output pin polarity specification in the table overrides
$| the [Model] Polarity specification such that the pin in the
$| [Diff Pin] column is Non-Inverting and the pin in the
$| inv_pin column is Inverting. This convention enables
$| one [Model] to be used for both pins.
$|
$| Column length limits are:
$| [Diff Pin] 5 characters max
$| inv_pin 5 characters max
$| vdiff 9 characters max
$| tdelay_typ 9 characters max
$| tdelay_min 9 characters max
$| tdelay_max 9 characters max
$|
$| Each line must contain either four or six columns. If "NA" is
$| entered in the vdiff, tdelay_typ, or tdelay_min columns, its
$| entry is interpreted as 0V or 0ns. If "NA" appears in
$| the tdelay_max column, its value is interpreted as the
$| tdelay_typ value. When using six columns, the headers
$| tdelay_min and tdelay_max must be listed. Entries for the
$| tdelay_min column are based on minimum magnitudes; and
$| tdelay_max column, maximum magnitudes. One entry of vdiff,
$| regardless of its polarity, is used for difference magnitudes.
$|---------------------------------------------------------------------------
$[Diff Pin] inv_pin vdiff tdelay_typ tdelay_min tdelay_max
$|
$ 3 4 150mV -1ns 0ns -2ns | Input or I/O pair
$ 7 8 0V 1ns NA NA | Output* pin pair
$ 9 10 NA NA NA NA | Output* pin pair
$16 15 200mV 1ns | Input or I/O pin pair
$20 19 0V NA | Output* pin pair, tdelay = 0ns
$22 21 NA NA | Output*, tdelay = 0ns
$ | * Could be Input or I/O with vdiff = 0V
|==============================================================================
| Keyword: [Model]
| Required: Yes
| Description: Used to define a model, and its attributes.
$| Sub-Params: Model_type, Polarity, Enable, Vinl, Vinh, C_comp, Vmeas, Cref
$| Rref, Vref
$| Usage Rules: Each Input, Output, I/O, 3-state, Open_drain, I/O_open_drain,
$| Open_sink, I/O_open_sink, Open_source, I/O_open_source,
$| Input_ECL, Output_ECL, I/O_ECL, and Terminator model must
| begin with the keyword [Model]. The model_name must match
| the one that is listed under the [Pin] keyword and must not
| contain more than 20 characters. An .ibs file must contain
| enough [Model] keywords to cover all of the model_names
| specified under the [Pin] keyword, except for those
| model_names that use reserved words (POWER, GND and NC).
| Model_names with reserved words are an exception and
| they do not have to have a corresponding [Model] keyword.
| C_comp is allowed to use "NA" for the min and max values only.
| The Model_type and C_comp sub-parameters are required.
|
$| The model types Input, I/O, I/O_open_drain, I/O_open_sink, and
$| I/O_open_soure must have Vinl and Vinh defined. If they are not
$| defined, the parser issues a warning and the default
$| values of Vinl=.8V and Vinh=2.0V are assumed.
$|
$| The model types Input_ECL and I/O_ECL must have Vinl and Vinh
$| defined. If they are not defined, the parser issues a
$| warning and the default values of Vinl=-1.475V and Vinh=-1.165V
$| are assumed.
$|
$| Cref, Rref and Rref are optional. These parameters correspond
$| to the test load that the manufacturer uses when specifying the
$| propagation delay and/or output switching time of the device.
$| Vmeas is the reference voltage level the manufacture uses
$| for the above. This information is included in the IBIS
$| specification to facilitate board-level timing simulation.
$| The assumed connections for Cref, Rref, and Rref are shown
$| below.
$|
## AR John Keifer: Please supply a connection diagram
$|
$| Other Notes: A complete [Model] description normally contains the following
$| keywords: [Voltage Range], [Pullup], [Pulldown], [GND Clamp],
$| [POWER Clamp], and [Ramp]. A Model_type of Terminator uses one
$| or more of the [Rgnd], [Rpower], [Rac], and [Cac] keywords.
$| However, some models may have only a subset of these keywords.
$| For example, an input structure normally only needs the
$| [Voltage Range], [GND Clamp], and possibly the [POWER Clamp]
$| keywords. If one or more of [Rgnd], [Rpower], [Rac], and [Cac]
$| keywords are used, then the Model_type must be Terminator.
$|
$| A "Terminator" is an input-only device that can have analog
$| loading effects on the circuit being simulated but has no
$| digital logic thresholds. Examples of Terminators are:
$| capacitors, termination diodes, pullup resistors etc.
$|
## The following paragraph seems confusing to me, particularly the
## parenthetical phrases. - Derrick
$|
$| Model_types with Open_sink specify that the output has
$| an OPEN side (the [Pullup] keyword is not used, or I = 0mA
$| for all voltages specified) AND the output SINKS current.
$| Model_types with "open_drain" have the identical meaning and
$| are retained for backward compatibility. Model_types with
$| Open_source specify that the output has an OPEN side (the
$| [Pulldown keyword is not used, or I = 0mA for all voltages
$| specified) AND the output SOURCES current. Model_types with
$| Input_ECL, Output_ECL, or I/O_ECL specify that the model
$| represents and ECL type logic that follows different
$| conventions for the [Pulldown] keyword.
$|
| C_comp defines the silicon die capacitance. This
| value should not include the capacitance of the package.
|
|------------------------------------------------------------------------------
[Model] model_name
Model_type Input, Output, I/O, 3-state, Open_drain,
$ I/O_open_drain, Open_sink, I/O_open_sink,
$ Open_source, I/O_open_source, Input_ECL,
$ Output_ECL, I/O_ECL, Terminator | List one only, if any
Polarity Non-Inverting, Inverting | List one only, if any
Enable Active-High, Active-Low | List one only, if any
| Signals RAS, CAS, A(0-64), D(0-128),... | Local list, if desired
Vinl = 0.8V | input logic "low" DC voltage, if any
Vinh = 2.0V | input logic "high" DC voltage, if any
$Vmeas = 1.5V |Test voltage timings are specified to
$Cref = 50pF |Timing specification test load capacitance value
$Rref = NA |Timing specification test load resistance value
$Vref = NA |Timing specification test load voltage
| variable typ min max
C_comp 12.0pF 10.0pF 15.0pF
|
|==============================================================================
$| Keyword: [Temperature range]
$| Required: Yes, if other than the preferred 0, 50, 100 degree C range
$| Description: Defines the temperature range over which the model is
$| to operate.
$| Usage Rules: List the actual die temperatures (not percentages) in the
$| usual typ, min, max format. "NA" is not allowed.
$| Other Notes: [Temperature range] also describes the temperature range over
$| which the various V/I curves and ramp rates were derived.
$|------------------------------------------------------------------------------
$| variable typ min max
$[Temperature range] 27.0C -50C 130.0C
|
|==============================================================================
| Keyword: [Voltage Range]
$| Required: Yes, if [Pullup Reference], [Pulldown Reference],
$| [POWER Clamp Reference], and [GND Clamp Reference] are not
$| present
$|Description: Defines the power supply voltage tolerance over which the
$| model is intended to operate. It also specifies the default
$| voltage rail to which the pullup and POWER_clamp V/I data is
$| referenced.
$|Usage Rules: Provide actual voltages (not percentages) in the usual typ, min,
$| max format. "NA" is allowed for the min and max values only.
$|---------------------------------------------------------------------------
$| variable typ min max
$[Voltage Range] 5.0v 4.5v 5.5v
$|
$|==============================================================================
$| Keyword: [Pullup Reference]
$| Required: Yes, if the [Voltage Range] keyword is not present.
$|Description: Defines a voltage rail other than that defined by the
$| [Voltage Range] keyword as the reference voltage for the
$| pullup V/I data.
$|Usage Rules: Provide actual voltages (not percentages) in the usual typ, min,
$| max format. "NA" is allowed for the min and max values only.
$|Other Notes: This keyword, if present, also defines the voltage range over
$| which the min and max dV/dt_r values are derived.
$|---------------------------------------------------------------------------
$| variable typ min max
$[Pullup Reference] 5.0V 4.5V 5.5V
$|
$|==============================================================================
$| Keyword: [Pulldown Reference]
$| Required: Yes, if the [Voltage Range] keyword is not present.
$|Description: Defines a power supply rail other than 0v as the reference
$| voltage for the pulldown V/I data. If this keyword is not
$| present, the voltage data points in the pulldown V/I table
$| are referenced to 0v.
$|Usage Rules: Provide actual voltages (not percentages) in the usual typ, min,
$| max format. "NA" is allowed for the min and max values only.
$|Other Notes: This keyword, if present, also defines the voltage range over
$| which the min and max dV/dt_f values are derived.
$|---------------------------------------------------------------------------
$| variable typ min max
$[Pulldown Reference] 0V 0V 0V
$|
$|==============================================================================
$| Keyword: [POWER Clamp Reference]
$| Required: Yes, if the [Voltage Range] keyword is not present.
$|Description: Defines a voltage rail other than that defined by the
$| [Voltage Range] keyword as the reference voltage for the
$| [POWER Clamp] V/I data.
$|Usage Rules: Provide actual voltages (not percentages) in the usual typ, min,
$| max format. "NA" is allowed for the min and max values only.
$|Other Notes: Refer the "NOTES ON SPECIFYING POWER SUPPLIES" section below.
$|---------------------------------------------------------------------------
$| variable typ min max
$[POWER Clamp Reference] 5.0V 4.5V 5.5V
$|
---------------------------------- end of part 2 ------------------------------
Received on Wed May 25 00:03:49 1994
This archive was generated by hypermail 2.1.8 : Fri Jun 03 2011 - 09:52:28 PDT