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- PLA(5OCTTOOLS) MISC. REFERENCE MANUAL PAGES PLA(5OCTTOOLS)
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- NAME
- pla - Format for physical description of Programmable Logic
- Arrays.
-
- SYNOPSIS
- pla
-
- DESCRIPTION
- This format is used by programs which manipulate plas to
- describe the physical implementation. Lines beginning with
- a `#' are comments and are ignored. Lines beginning with a
- `.' contain control information about the pla. Currently,
- the control information is given in the following order:
- .i <number of inputs>
- .o <number of outputs>
- .p <number of product terms (pterms)>
- and optionally,
- .na<name> (the name to be used for the pla)
-
- What follows then is a description of the AND and OR planes
- of the pla with one line per product term. Connections in
- the AND plane are represented with a `1' for connection to
- the non-inverted input line and a `0' for connection to the
- inverted input line. No connection to an input line is
- indicated with 'x', 'X', or '-' with '-' being preferred.
- Connections in the OR plane are indicated by a '1' with no
- connection being indicated with 'x', 'X', '0', or '-' with
- '-' being preferred. Spaces or tabs may be used freely and
- are ignored.
-
- The end of the pla description is indicated with:
- .e
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- Programs capable of handling split and folded arrays employ
- the following format:
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- AND PLANE
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- Column (1) Contact to input (2) No contact to input
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- (1) (2)
- 1 - Normal contacts, no splits or folds
- ! _ Split below
- ; , Fold to right
- : . Split below and fold to right
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- OR PLANE
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- Column (1) Contact to output (2) No contact to output
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- (1) (2)
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- PLA(5OCTTOOLS) MISC. REFERENCE MANUAL PAGES PLA(5OCTTOOLS)
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- I ~ Normal contacts, no splits or folds
- i = Split below
- | ' Fold to right
- j " Split below and fold to right
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- ADDITIONAL ELEMENTS
-
- * Input buffer
- + Output buffer
- D Depletion load associated with product term
- N No depletion load associated with product term
-
-
- Note that the decoding function of the AND plane is
- separated from the specification of its connectivity. This
- makes the AND and OR plane specifications identical.
-
- These programs handle the following more general set
- of .parameters:
-
- .il <number of left-AND plane inputs>
- .ir <number of right-AND plane inputs>
- .ol <number of left-OR plane inputs>
- .or <number of right-OR plane inputs>
- .p <number of product terms>
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- .ilt <labels left-top-AND plane>
- .ilb <labels left-bottom-AND plane>
- .irt <labels right-top-AND plane>
- .irb <labels right-bottom-AND plane>
- .olb <labels left-bottom-OR plane>
- .olt <labels left-top-OR plane>
- .orb <labels right-bottom-Or plane>
- .ort <labels right-top-Or plane>
- .pl <labels left product terms>
- .pr <labels right product terms>
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- The first group of parameters must precede the second group.
- If there is only one AND or OR plane it is assumed to be the
- left one and the companion .parameters may be shortened by
- dropping their (left,right) designation character.
-
- In order to better deal with folded and split PLAs, the
- following .parameters are proposed:
-
- .ig <input group>
- .og <output group>
- .ins <inputs excluded from splitting>
- .inf <inputs excluded from folding>
- .ons <outputs excluded from splitting>
- .onf <outputs excluded from folding>
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- PLA(5OCTTOOLS) MISC. REFERENCE MANUAL PAGES PLA(5OCTTOOLS)
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- In order to build finite state machines, the
- following .parameters are proposed:
-
- .iltf <left-top-AND feedback terms>
- .ilbf <left-bottom-AND feedback terms>
- .irtf <right-top-AND feedback terms>
- .irbf <right-bottom-AND feedback terms>
- .oltf <left-top-OR feedback terms>
- .olbf <left-bottom-OR feedback terms>
- .ortf <right-top-OR feedback terms>
- .orbf <right-bottom-OR feedback terms>
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- .ilr <left re-ordered inputs>
- .irr <right re-ordered inputs>
- .olrf <left re-ordered outputs>
- .orrf <right re-ordered outputs>
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- The .XXXf parameters must occur in pairs, with the .oXXf
- line first. Input and output terms must occur on the same
- side (top, bottom) of the PLA. Feedback terms must be given
- in ascending order. The re-order .parameters simplify feed-
- back routing.
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- SEE ALSO
- espresso(1OCTTOOLS), espresso(5OCTTOOLS), misII(1OCTTOOLS)
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