EPM7256EGC192-15 데이터 시트보기 (PDF) - Altera Corporation

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EPM7256EGC192-15

Programmable Logic Device Family

Altera Corporation 

MAX 7000 Programmable Logic Device Family Data Sheet

Shareable Expanders

Each LAB has 16 shareable expanders that can be viewed as a pool of

uncommitted single product terms (one from each macrocell) with

inverted outputs that feed back into the logic array. Each shareable

expander can be used and shared by any or all macrocells in the LAB to

build complex logic functions. A small delay (tSEXP) is incurred when

shareable expanders are used. Figure 5 shows how shareable expanders

can feed multiple macrocells.

Figure 5. Shareable Expanders

Shareable expanders can be shared by any or all macrocells in an LAB.

Macrocell

Product-Term

Logic

Product-Term Select Matrix

Macrocell

Product-Term

Logic

36 Signals

from PIA

16 Shared

Expanders

Parallel Expanders

Parallel expanders are unused product terms that can be allocated to a

neighboring macrocell to implement fast, complex logic functions.

Parallel expanders allow up to 20 product terms to directly feed the

macrocell OR logic, with five product terms provided by the macrocell and

15 parallel expanders provided by neighboring macrocells in the LAB.

12

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