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1、GEIA-STD-000 1 Approved: 10/07/2005 GEIA STANDARD IBIS Interconnect Modeling Specification GEIA-STD-0001 October 2005 GOVERNMENT ELECTRONICS AND INFORMATION TECHNOLOGY ASSOCIATION A Sector o f the Electronic Industries Alliunc Copyright Government Electronics therefore it is enough to use only the p
2、refixes to scale the parameters. However, for clarity, it is allowed to use full abbreviations for the units, (e.g., pF, nH I mA, m0hm). In addition, scientific notation IS allowed (e.g., 1.2345e-12). 10) All temperatures are represented in degrees Celsius. 11) All lines that occur before the Begin
3、Header keyword or after the End keyword shall be treated as comments and ignored by the parser. The intent of this rule is to facilitate the inclusion of HTML tags, revision control headers, etc. at the beginning of the ICM file. 12) The following words are reserved words and must not be used for an
4、y other purposes in the document: POWER - reserved model name, used with power supply pins, GND - reserved model name, used with ground pins, NC - reserved model name, used with no-connect pins, NA - used where data not available. 13) Unless explicitly overridden by the subparameter description, a s
5、ingle numeric argument is separated from its associated subparameter by an equals sign (=); white space around the equals sign is optional. A set of numeric values (such as typ, min and max values) is separated from its associated subparameter by white space, without an equals sign. Symbolic (text)
6、arguments are separated from their associated subparameter by one or more white spaces. 14) Note that the text here, in many cases, assumes that the model data describes a connector. However, other types of interconnect can be modeled using the ICM format; in these cases, the words “pin“ and “port“
7、in the text below can be interpreted to refer to the locations where the interconnect is accessed for probing, measurement or analysis. 6 Copyright Government Electronics one stub matrix is re-used, and another stub is repeated Begin ICM Model MyModelExample4 ICM - model - type MLM Tree Path Descrip
8、tion Model pinmap MyModelPinMapA Section Mult=l A Fork Section Mult=l stubl Section Mult=l stub2 Section Mult=l stubl Endfork Section Mult=l B Fork Endfork Section Mult=l C Model - pinmap MyModelPinMapB Section Mult=2 stub4 End ICM Model . Example 5: 2 ports per conductor, 3 stubs Begin ICM Model My
9、Model4 ICM model type MLM Tree-Path Description Model pinmap MyModelPinMapA Section Mult=l A Fork Endfork Fork Section Mult=l Stubl Section Mult=l B Section Mult=l Stub2 Section Mult=l Stub3 Section Mult=l Stub4 Endfork 26 Copyright Government Electronics while EDA tools are encouraged to implement
10、one or more of the approaches described, they are free to implement others not listed here: (1) Centering the Swath around the pins of interest (2) Expansion and Centering: Expanding the Swath matrix into a 37 Copyright Government Electronics the swath simply represents a small portion of the larger
11、 interconnect. EDA tools should not infer data regarding other columns in the full interconnect in this case. When the signals of interest are at the left or right the swath would normally be positioned to “cover“ those edges. For example, column A of the swath matrix may be “lined up“ with column 1
12、 of the interconnect. However, columns 6 through 9 of the full interconnect would not be described at all, nor should their behavior be inferred by EDA tools using this swath data. 38 Copyright Government Electronics 1 - name NEG 0 NEG 1 POS-o POSI1 - ICM Node Map PORT A l PORTA2 PORTA3 PORTA4 PORTA
13、5 ICM N o d e Map PORT B 1 PORT-B2 PORTB3 PORTB4 PORTB5 - I Pin I Pin P o r t A node A l A2 A3 A4 A5 P o r t B node B 1 B2 B3 B4 B5 name POS-0-A NEG 0 A P O S I l A NEG 1 A REF - - name POS-OB NEG 0 B P O S I l B NEG 1 B REF - - ICM Node Map PORT A l PORTA2 PORTA3 PORTA4 PORTA5 ICM N o d e Map PORT
14、B 1 PORTB2 - I Pin I Pin P o r t A node A l A2 A3 A4 A5 P o r t B node B 1 B2 name POS-0-A NEG 0 A P O S I l A NEG 1 A REF - - name POS-OB NEG 0 B - - 49 Copyright Government Electronics charges will build up on each side of the circuit element. In practice, this situation cannot exist more than For
15、 the purposes of simulation the condition does not affect resultant loop inductance values. Then from the currents found the magnetic fields and inductance can be calculated. In this way, the self and mutual inductances of any section can be calculated. ins tead instantaneously. the This representat
16、ion of inductance in terms of partial self and mutual inductance allows the analysis of any combination of current paths. The signal and return current paths can be defined in circuit after the model is established. Assuming that the self inductance is included in the return path, the circuit under
17、simulation can account for the impact on signal- cross-talk and ground-bounce from currents passing through any combination of pins. integrity, section Signal . Signal Signal . Signal Signal . Signal (side A) I (side B) I There are many ways to create this information using either 2D or 3D field sol
18、vers. It may also be possible to create this information using other methods which are left to the model developer. For an MLM model, partial inductance values are required. Off-diagonal terms may be positive floating point numbers, positive integer numbers, negative floating point numbers, negative
19、 integer numbers or zero. Capacitance Matrix Description See “Multi-Line Capacitance Matrix“ section above for more information on Multi-Line Matrices. Two capacitance matrix methods are supported: 59 Copyright Government Electronics Multi-Line , Maxwell Capacitance Matrix (coupled) If ICM - model -
20、 type is SLM - * then all sections must only contain Single Line Capacitance Matrix. If ICM model type is MLM then all sections must use a Maxwell Capacitance a s stated below. Single-Line Capacitance Matrix Description: To define capacitance requires conductors separated by a dielectric. The conduc
21、tors are those found in a loop of a closed path including a signal and all possible return paths. The Maxwell Capacitance Matrix relates the total consisting charges on the conductors to the voltages applied to them. Q=Cm VI where Cm is the Maxwell Capacitance Matrix, QI is the vector of total condu
22、ctor charges, and VI is a vector of applied voltages. The negative values of the off-diagonal entries can be explained on physical grounds: if you put +1 volt on a single conductor and O volts on the others, then you induce negative charges on those other conductors to terminate the field lines eman
23、ating from the conductor at 1 volt. Maxwell Capacitance Matrix Description In the Maxwell Capacitance Matrix, the diagonal term is the maximum capacitance that the conductor encounters, meaning the capacitance to ground plus the capacitances to all the other conductors. In the Maxwell Capacitance Ma
24、trix, the off-diagonal term is the capacitance that the conductor encounters relative to a second conductor. This capacitance value is affected by other nearby conductors during the field extraction phase. It should not normally be used by itself to determine the capacitance of a random pair of cond
25、uctors in a given structure. When the Section or N-section subparameters use the “Mult“ variable then DO NOT USE farads/unit length as this is the total value and includes the length of this section. When the Section or N-section subparameters use the “Len“ variable then USE farads/unit length. Off-
26、diagonal terms must be negative floating point numbers, negative integer numbers or zero. Conductance Matrix Description: Copyright Government Electronics the resulting data set is assumed to be frequency-invariant or identical at all frequencies. Begin ICM Section ExampleMatrixOl Derivation Method
27、Distributed Resistance Matrix Banded-matrix Bandwidth O Inductance Matrix Full - matrix Frequency O Row 1 3.048590003-07 4.731850003-08 1.740220003-07 7.354690003-08 Row 2 3.048590003-07 4.731850003-08 1.740220003-07 7.354690003-08 Row 3 3.048590003-07 4.731850003-08 1.740220003-07 7.354690003-08 Ro
28、w 4 3.048590003-07 1.338070003-08 1.342800003-08 2.732010003-08 1.342800003-08 2.732010003-08 2.732010003-08 2.732010003-08 6.121910003-09 1.338070003-08 7.354690003-08 7.354690003-08 7.354690003-08 66 Copyright Government Electronics & Information Technology Association Provided by IHS under licens
29、e with GEIA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GEIA-STD-000 1 1.740220003-07 Row 5 Rowl 6 Row 7 Rowl 8 4.700490003-07 1.437910003-07 4.700490003-07 1.437910003-07 4.7004900
30、03-07 1.437910003-07 4.700490003-07 F r e q u e n c y 1. OM Row 1 1.524295003-07 8.701100003-08 Row 2 1.524295003-07 8.701100003-08 Row 3 1.524295003-07 8.701100003-08 Row 4 1.524295003-07 8.701100003-08 Row 5 Rowl 6 Row 7 Rowl 8 2.350245003-07 2.350245003-07 2.350245003-07 2.350245003-07 2.36592500
31、3-08 3.677345003-08 2.365925003-08 3.677345003-08 2.365925003-08 3.677345003-08 6.690350003-09 7.189550003-08 7.189550003-08 7.189550003-08 F r e q u e n c y 1.000000003+09 Row 1 7.621475003-08 4.350550003-08 Row 2 7.621475003-08 4.350550003-08 Row 3 7.621475003-08 4.350550003-08 Row 4 7.621475003-0
32、8 4.350550003-08 Row 5 Rowl 6 Row 7 Rowl 8 1.175122503-07 1.175122503-07 1.175122503-07 1.175122503-07 T h e capacitance 1.182962503-08 1.838672503-08 1.182962503-08 1.838672503-08 1.182962503-08 1.838672503-08 3.345175003-09 3.594775003-08 3.594775003-08 3.594775003-08 5.758050003-08 5.758050003-08
33、 6.714000003-09 1.366005003-08 6.714000003-09 1.366005003-08 1.366005003-08 1.366005003-08 2.879025003-08 2.879025003-08 3.357000003-09 6.830025003-09 3.357000003-09 6.830025003-09 6.830025003-09 6.830025003-09 1.439512503-08 1.439512503-08 matrix has sparse coupling: 2.950880003-08 3.060955003-09 6
34、.690350003-09 3.677345003-08 3.677345003-08 3.677345003-08 1.475440003-08 1.530477503-09 3.345175003-09 1.838672503-08 1.838672503-08 1.838672503-08 7.377200003-09 C a p a c i t a n c e M a t r i x S p a r s e m a t r i x 67 Copyright Government Electronics & Information Technology Association Provi
35、ded by IHS under license with GEIA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GEIA-STD-000 1 F r e q u e n c y O Row 1 1 2.482270003-10 2 -1.566510003-11 5 -9.541580003-11 6 -7.156
36、840003-12 Row 2 2 2.517980003-10 3 -1.565520003-11 5 -6.851990003-12 6 -9.048600003-11 7 -6.820030003-12 Row 3 3 2.517980003-10 4 -1.566510003-11 6 -6.820030003-12 7 -9.048600003-11 8 -6.851990003-12 Row 4 4 2.482270003-10 7 -7.156840003-12 8 -9.541580003-11 Row 5 5 1.735420003-10 6 -3.382470003-11
37、Row 6 6 1.868330003-10 7 -3.272260003-11 Row 7 7 1.868330003-10 8 -3.382470003-11 Row 8 8 1.735420003-10 F r e q u e n c y 1. OM Row 1 1 6.205675003-11 2 -3.916275003-12 5 -2.385395003-11 6 -1.789210003-12 Row 2 2 6.294950003-11 3 -3.913800003-12 5 -1.712997503-12 6 -2.262150003-11 7 -1.705007503-12
38、 Row 3 3 6.294950003-11 4 -3.916275003-12 6 -1.705007503-12 7 -2.262150003-11 8 -1.712997503-12 Row 4 4 6.205675003-11 7 -1.789210003-12 8 -2.385395003-11 Row 5 68 Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Licensee=IHS Employees/111
39、1111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GEIA-STD-000 1 5 4.338550003-11 6 -8.456175003-12 Rowl 6 6 4.670825003-11 7 -8.180650003-12 Row 7 7 4.670825003-11 8 -8.456175003-12 Rowl 8 8 4.338550003-11 Freque
40、ncy 1.000000003+09 Row 1 1 3.102837503-11 2 -1.958137503-12 5 -1.192697503-11 6 -8.946050003-13 Row 2 2 3.147475003-11 3 -1.956900003-12 5 -8.564987503-13 6 -1.131075003-11 7 -8.525037503-13 Row 3 3 3.147475003-11 4 -1.958137503-12 6 -8.525037503-13 7 -1.131075003-11 8 -8.564987503-13 Row 4 4 3.1028
41、37503-11 7 -8.946050003-13 8 -1.192697503-11 Row 5 5 2.169275003-11 6 -4.228087503-12 Row 6 6 2.335412503-11 7 -4.090325003-12 Row 7 7 2.335412503-11 8 -4.228087503-12 Row 8 End ICM Section 8 2.169275003-11 69 Copyright Government Electronics & Information Technology Association Provided by IHS unde
42、r license with GEIA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GEIA-STD-000 1 Section 9 END K E Y W O R D Keyword: End Required: Yes Description: Specifies end of f i l e . Any tex
43、t after the End keyword is Usage Rules: The End keyword marks the end of the interconnect model i n an ignored. ICM f i l e and must be the l a s t ICM keyword i n the f i l e . . End 70 Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Lic
44、ensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- GEIA Document Improvement Proposal Submitters Name: If, in the review or use of this document, a potential change is made evident for safety
45、, health, or technical reasons please fill in the appropriate information below and mail or FAX to: Telephone No.: FAX No.: E-mail: Government Electronics and Information Technology Association (GEIA) Standards & Technology Department 2500 Wilson Blvd. Arlington, VA 2220 1 FAX: (703) 907-7968 Urgenc
46、y - of Change: Immediate : Document No. - At next revision: I Document Title: b. Recommended Changes: c. ReasodRationale for Recommendation: Additional Remarks: Signature: I Date: FOR GEIA USE ONLY Responsible Committee: Chairman: Date comments forwarded to Committee Chairman: Copyright Government E
47、lectronics & Information Technology Association Provided by IHS under license with GEIA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Government Electronics & Information Technology Association Provided by IHS under license with GEIA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 23:36:55 MDTNo reproduction or networking permitted without license from IHS -,-,-