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SEMI P39-0304 E2 © SEMI 2004 17 19.5 LAYERN AME records may be re peated for the same layer name. The complete m apping for a lay er nam e is formed by the union of all layer, datatype, textlaye r, and texttype ranges as…

SEMI P39-0304

17.2 propname-string is an n-string which holds the property name. The reference-number is an unsigned-

integer which is either implicitly or explicitly assigned to the property name. Implicit assignment occurs in record

type ‘7’, by assigning sequential reference numbers beginning with 0 as each successive PROPNAME record is

encountered. Explicit assignment occurs in record type ‘8’.

17.3 Record types ‘7’ and ‘8’ may not both be used in the same OASIS file.

17.4 EXCEPTION HANDLING

— The appearance of two PROPNAME records in the same file with the same

number but different names, or two PROPNAME records in the same file with the same name but different

numbers, should be treated as a fatal error. The appearance of both record types ‘7’ and ‘8’ in the same OASIS file

should be treated as a fatal error.

18 PROPSTRING Record

18.1 A PROPSTRING record associates a property string with a unique reference number. This allows

PROPERTY records, if desired, to avoid redundantly storing the actual text of the property string and instead refer

to the property string by its assigned reference number. It has the following format:

‘9’ prop-string

‘10’ prop-string reference-number

18.2 prop-string is an a-string, b-string , or n-string which holds the property string, depending on the referencing

PROPERTY record. The reference-number is an unsigned-integer which is either implicitly or explicitly assigned

to the property string. Implicit assignment occurs in record type ‘9’, by assigning sequential reference numbers

beginning with 0 as each successive PROPSTRING record is encountered. Explicit assignment occurs in record

type ‘10’.

18.3 Record types ‘9’ and ‘10’ may not both be used in the same OASIS file.

18.4 EXCEPTION HANDLING

— The appearance of two PROPSTRING records in the same file with the same

number but different names should be treated as a fatal error. The appearance of both record types ‘9’ and ‘10’ in the

same OASIS file should be treated as a fatal error.

19 LAYERNAME Record

19.1 A LAYERNAME record provides a means of mapping numeric (layer,datatype) and (layer,texttype)

combinations to layer names. It has the following format:

‘11’ layername-string layer-interval datatype-interval

‘12’ layername-string textlayer-interval texttype-interval

19.2 Record type ‘11’ maps a range of (layer,datatype) numbers to a layer name, and record type ‘12’ maps a range

of (textlayer,texttype) numbers to a layer name.

19.3 layername-string is an n-string containing the layer name.

19.4 Each of the interval fields consists of an unsigned-integer denoting the interval type, followed by 0, 1, or 2

unsigned-integers representing the bounds of that interval as follows:

Table 13 LAYERNAME Interval Types

Type Bounds Implied Range

0 to  

bound-a

0 to bound-a

bound-a

bound-a to 

bound-a bound-a

bound-a bound-b

bound-a to bound-b

SEMI P39-0304

19.5 LAYERNAME records may be repeated for the same layer name. The complete mapping for a layer name is

formed by the union of all layer, datatype, textlayer, and texttype ranges associated with that name.

20 CELL Record

20.1 A CELL record introduces a cell definition. It has the following format:

‘13’ reference-number

‘14’ cellname-string

20.2 In record type ‘13’, reference-number is an unsigned-integer referring to a CELLNAME record where the

cell name is stored. In record type ‘14’, cellname-string stores the cell name locally. In either representation, the

cell name must be an n-string.

20.3 All subsequent records in the file up to the next CELL, END, or <name> record are considered to be part of

that cell.

20.4 EXCEPTION HANDLING

— Use of a reference-number for which there is no corresponding CELLNAME

record within the same OASIS file should be treated as a fatal error. Multiple CELL records within a single file

which refer to the same cell name (in effect, a duplicate cell definition) should also be treated as a fatal error.

21 XYABSOLUTE & XYRELATIVE Records

21.1 The XYABSOLUTE and XYRELATIVE records control the value of modal variable xy-mode, which in turn

governs the interpretation of the x and y values found in PLACEMENT, <geometry>, and TEXT records. They

consist simply of a record-ID with no additional fields:

‘15’ = XYABSOLUTE

‘16’ = XYRELATIVE

21.2 When each CELL record is encountered, modal variable xy-mode is set to absolute, and related modal position

variables placement-x, placement-y, geometry-x, geometry-y, text-x, and text-y are set to 0. The presence of an

XYRELATIVE record forces modal variable xy-mode to relative, and the presence of an XYABSOLUTE record

forces modal variable xy-mode to absolute. This mode may be changed any number of times within a cell definition.

21.3 In absolute mode, explicit x and y values, when present, are used directly as the actual (x,y) coordinates.

21.4 In relative mode, explicit x and y values, when present, are interpreted as relative displacements from the

stored position information in modal variables placement-x, placement-y, geometry-x,

geometry-y, text-x, or text-y,

depending on the record type in which they occur. In this mode, the actual x-coordinate is computed as the sum of

the x value and its corresponding modal position variable, and the actual y-coordinate is computed as the sum of the

y value and its corresponding modal position variable.

21.5 In both absolute and relative modes, when an x or y value is not explicitly present in the record, the value of

the corresponding modal position variable is used for the actual x or y coordinate. In both absolute and relative

modes, the corresponding modal position variables are always updated with the actual (x,y) coordinate position.

21.6 The interpretation of point-lists and repetitions does not depend on absolute or relative mode. Also, even when

a given element includes a repetition, the corresponding modal position variables (placement-x, placement-y,

geometry-x, geometry-y, text-x, or text-y) are always updated with the actual (x,y) coordinate of the initial element.

22 PLACEMENT Record

22.1 A PLACEMENT record describes one or more placements of the referenced cell within the current cell. It has

the following format:

‘17’ placement-info-byte [ reference-number | cellname-string ] [ x ] [ y ] [ repetition ]

‘18’ placement-info-byte [ reference-number | cellname-string ] [ magnification ] [ angle ]

[ x ] [ y ] [ repetition ]

SEMI P39-0304

22.2 In record type ‘17’, placement-info-byte contains the bit pattern ‘CNXYRAAF’.

22.3 In record type ‘18’, placement-info-byte contains the bit pattern ‘CNXYRMAF’.

22.4 When C = 1, the cell reference is explicit, in which case N = 1 means that reference-number (an unsigned-

integer) is present, and refers to a CELLNAME record where the cell name is stored; N = 0 means that cellname-

string (an n-string) is present and stores the cell name locally. When C = 0, N is ignored, and the value of modal

variable placement-cell is used, referring to the same cell as the previous PLACEMENT record.

22.5 x and y are signed-integer coordinates representing either the absolute or the relative (x,y) location of the

placement. X is 1 if x is present, and Y is 1 if y is present. When either x or y is unspecified, the value of modal

variable placement-x or placement-y, respectively, is used instead. Refer to Section 21 on page 17 for a discussion of

how absolute and relative modes affect the interpretation of x and y.

22.6 R is 1 if repetition is present. F = 1 indicates reflection (or flip) about the x-axis; F = 0 indicates no flip.

22.7 In record type ‘17’, magnification is 1.0 and rotation is a counterclockwise integral multiple of 90°: AA = 0 for

0°,

AA = 1 for 90°, AA = 2 for 180°, and AA = 3 for 270°.

22.8 In record type ‘18’, magnification and rotation are reals; angle is dimensioned in degrees, with positive values

denoting a counterclockwise rotation; magnification is, of course, unitless. A is 1 if angle is present, otherwise the

rotation defaults to 0°. M is 1 if magnification is present, otherwise the magnification defaults to 1.0.

22.9 Each successive PLACEMENT record updates all placement-related modal variables.

22.10 EXCEPTION HANDLING

— Use of a reference-number for which there is no corresponding CELLNAME

record should be treated as a fatal error. Any recursive cell reference (a cell placing a copy of itself within itself)

should be treated as a fatal error. Magnification values which are negative or zero should be treated as fatal errors.

Floating point values of NaN or Inf for either magnification or angle should be treated as fatal errors.

PLACEMENT records may refer to CELL records regardless of their relative location within the file, and may also

refer to external cells which are not defined in the same file.

23 Placement Transform Representation

23.1 EDA applications generally define a placement transform as a 3×3 matrix:

T =

X00 X01 0

X10 X11 0

X20 X21 1

which transforms any point (p,q) via left-multiplication by the 1×3 row matrix [ p q 1 ]. Conversion of OASIS

placement data to this form is defined as follows:

X00 = cos( angle ) * magnification

X01 = sin( angle ) * magnification

X10 = -f * sin( angle ) * magnification

X11 = +f * cos( angle ) * magnification

X20 = x

X21 = y

where f = 1 if F = 0, f = -1 if F = 1, “angle” is the rotation angle given by either AA or angle in the PLACEMENT

record, and “magnification” is magnification if specified, else 1.0. Note that if the rotation is a multiple of 90° and

the magnification is 1.0, then the upper 2×2 sub-matrix takes one of the following eight forms and OASIS

processors may optimize accordingly: