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FIGURE 18.16 ODB++ job tree The left hand side of the figure describes the top-most elements under the Job level and the right hand side describes the top-most elements under the Step level.
18.3.4.2 IPC-2581. IPC-2581, on the part of the IPC and the electronics industry, is a universal vendor-independent data exchange format.* IPC-D-350 was the first such format in the 1970s, followed by IPC-2511 GenCAM in the 1990s; in the new millennium, IPC-2581 evolved. IPC-2581 (nicknamed Offspring ) is based on ODB++ and is the culmination of the ODB++ and GenCAM convergence project sponsored by the National Electronics Manufacturing Initiative (NEMI). IPC-2581 has inherited some of IPC-2511 GenCAM characteristics. IPC-2581 is actually a series of IPC-258x documents, where x represents 1 9; IPC-2581 consists of the generic requirements (or, in this case, the full format description), whereas IPC-2582 and above are sectional requirements. IPC-2584, for example, contains the sectional requirements for fabrication and explains which generic IPC-2581 elements are required for bare-board fabrication and which elements are optional.
* For an IPC-2581 viewer, Contact IPC at http://www.ipc.org.
PRINTED CIRCUITS HANDBOOK
# #Feature symbol names # $0 r3.937 $1 r5 $2 r5.118 $3 r5.906 $4 r9.843 $5 r13.779 $6 r19.685 $7 r23.622 $8 r27.559 $9 r30.315 $10 r39.37 $11 r53.15 $12 r55.118 # #Feature attribute names # @0 .nomenclature @1 .geometry @2 .string @3 .pad_usage @4 .string_angle # #Layer features # P 5.3145669 3.215 0 P 0 0 P 5.1909449 3.1756299 12 P 0 2;1=0,3=0 L -0.3374074 1.5350394 -0.2950992 1.5249055 2 P 0 ;0,2=270.000000 L -0.2950992 1.5249055 -0.2598425 1.5249055 2 P 0 ;0,2=270.000000
FIGURE 18.17 An ODB++ feature file with annotations. P 5.3145669 3.215 0 P 0 0 indicates a pad at (5.314.., 3.215) with a 3.937 mil diameter. (The first 0 points to symbol 0, clearly represented by $0 r3.937 in the symbols section. P 0 0 indicates that the pad has P (positive polarity), is not rotated 0 , and has zero attribute values.
Symbol 0 definition
IPC-2581 is an all-inclusive, explicit, accurate, and intelligent format containing all data needed for both manufacturing and assembly. The following data elements can be described in a full-mode IPC-2581 file:
Original schematic capture files Original layer/stack instance files Original conductor routing files
INFORMATION FORMATING AND EXCHANGE
BOM and AVL Component packages and logical Nets Outerlayer copper lands Solder mask, solder paste, and legend layers Drilling and routing layers Documentation layers Physical Nets Outer copper layers (non-lands) Innerlayers Nondocument miscellaneous layers Instructions and specifications Component tuning and programming instructions, program files, and/or references thereof
This format contains information not available in the earlier formats (including details about personnel and the enterprise, material requirements, and component tuning and programming). Most industry tools lack these items in their internal formats, so at this point these sections are usable primarily in human-readable form. Future evolution and market acceptance of IPC-2581 depend on committee work and vendor implementation and could well take several more years.
Component Information BOM and AVL files do not usually follow any global standard, but rather conform to the internal standards of each organization. Their format may be simple ASCII or a spreadsheet (see Fig. 18.18). Interpretation of BOM and AVL files requires either manual or semi-automatic parsing followed by conversion into a known supported format. This process might entail creation of templates that recognize various types of BOM and AVL files and translate them semi-automatically. BOM and AVL files are sometimes combined in a single BOM/AVL file that lists reference designators to be placed and part-ordering information. Figure 18.19 is a typical AVL file sample as seen in already-tabulated format. The line numbers are not part of the file. Lines 1 through 5 are header lines and lines 6 through 15 are data lines. There are two types of data lines; line 1 contains column headers for the first line type, and line 3 contains column headers for the second line type. Lines 6 and 12 are lines of the first type, representing functional devices (usually referred to as customer part
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