ISPXPLD5512MX 查看數據表（PDF） - Lattice Semiconductor

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ISPXPLD5512MX

3.3V, 2.5V and 1.8V In-System Programmable eXpanded Programmable Logic Device XPLD™ Family

Lattice Semiconductor 

Lattice Semiconductor

Figure 6. Dual-OR PT Sharing Array

From PT0

ispXPLD 5000MX Family Data Sheet

From Carry

n-7 In

To I/O Block

PT OE

From PT1

PTSA Bypass To Macrocell

From PT2

From PT3

N

To PTSA

To Macrocell

PT Clock

To Macrocell

PT Preset

From PT4

To

Carry

n+7

Out

To Macrocell

PT Reset

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)

PTSA OR 0

PTSA OR 1

PTSA OR 2

PTSA OR 3

Macrocell 0

Macrocell 1

Macrocell 2

PTSA OR 29

PTSA OR 30

PTSA OR 31

Macrocell 29

Macrocell 30

Macrocell 31

7

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