ISPXPLD5000MX datasheet(7/92 Pages) LATTICE

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Lattice Semiconductor

ispXPLD 5000MX Family Data Sheet

Figure 6. Dual-OR PT Sharing Array

Product Term Sharing Array

The Product Term Sharing Array (PTSA) consists of 32 inputs from the Dual-OR Array (Expandable PTSA OR) and

32 outputs directly to the macrocells. Each output is the OR term of any combination of the seven Expandable

PTSA OR terms connected to that output. Every Nth macrocell is connected to N-3, N-2, N-1, N, N+1, N+2 and

N+3 PTSA OR terms via a programmable connection. This wraps around the logic, for example, Macrocell 0 gets

its logic from 29, 30, 31, 0, 1, 2, 3. The Expandable PTSA OR used in conjunction with the PTSA allows wide func-

tions to be implemented easily and efﬁciently. Without using the Expandable PTSA OR capability, the greatest

number of product terms that can be included in a single function with one pass of delay is 35. Up to 160 product

terms can be included in a single function through the use of the expandable PTSA OR capability. Figure 7 shows

the graphical representation of the PTSA.

Figure 7. Product Term Sharing Array (PTSA)

From

n-7

Carry

Out

n+7

From PT0

From PT1

From PT2

From PT3

From PT4

PTSA Bypass

To Macrocell

To I/O Block

To Macrocell

To PTSA

PT OE

PT Clock

PT Preset

PT Reset

PTSA OR 0

PTSA OR 1

PTSA OR 2

PTSA OR 3

PTSA OR 29

PTSA OR 30

PTSA OR 31

Macrocell 0

Macrocell 1

Macrocell 2

Macrocell 29

Macrocell 30

Macrocell 31

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