EPM7032A 查看數據表（PDF） - Altera Corporation

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EPM7032A

Programmable Logic Device Family

Altera Corporation 

MAX 7000A Programmable Logic Device Data Sheet

Expander Product Terms

Although most logic functions can be implemented with the five product

terms available in each macrocell, more complex logic functions require

additional product terms. Another macrocell can be used to supply the

required logic resources. However, the MAX 7000A architecture also

offers both shareable and parallel expander product terms that provide

additional product terms directly to any macrocell in the same LAB. These

expanders help ensure that logic is synthesized with the fewest possible

logic resources to obtain the fastest possible speed.

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 3 shows how shareable expanders

can feed multiple macrocells.

Figure 3. MAX 7000A 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

10

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