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I/O Buffer Information Specification, Electronic Board Description File Modifier

IP.com Disclosure Number: IPCOM000125120D
Publication Date: 2005-May-19
Document File: 3 page(s) / 392K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that uses a Practical Extraction and Reporting Language (PERL) script algorithm to modify an Electronic Board Description (EBD) file, as described in the I/O Buffer Information Specification (IBIS), to improve the signal integrity analysis process. Benefits include eliminating the need to manually scan an EBD to find a trace segment length.

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I/O Buffer Information Specification, Electronic Board Description    File Modifier

Disclosed is a method that uses a Practical Extraction and Reporting Language (PERL) script algorithm to modify an Electronic Board Description (EBD) file, as described in the I/O Buffer Information Specification (IBIS), to improve the signal integrity analysis process. Benefits include eliminating the need to manually scan an EBD to find a trace segment length.

Background

Vendors often offer EBD and other simulation model files (defined by the IBIS) that can be downloaded from their Web sites to aid in signal integrity analysis. EBD files specifically describe the layout and transmission line characteristics of an actual board product that they offer, such as a DDR DIMM. Each EBD file contains very detailed information about trace routing, trace length, and trace electrical characteristics. A sample excerpt from and EBD is shown in Figure 1.

Figure 1 shows the initial routing scheme for the CS1 signal on a particular DDR DIMM; the signal happens to be assigned to physical pin 71 on the DIMM. The ‘Len’ descriptor defines the  length of a trace. Multiple “Len” descriptors indicate that the electrical characteristics of the trace are changing as the trace is routed on the board, often as a result of traveling through vias or making turns. On each “Len” line, information related to the electrical values of inductance (L), capacitance (C), and resistance (R) are included for purposes of signal integrity analysis.

When using simulation tools, it is often necessary to manually model the board (such as the DDR DIMM shown in Figure 1) so that a simulati...