MAX9000 Просмотр технического описания (PDF) - Altera Corporation

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MAX9000

Programmable Logic Device Family

Altera Corporation 

MAX 9000 Programmable Logic Device Family Data Sheet

Expander Product Terms

Although most logic functions can be implemented with the five product

terms available in each macrocell, some logic functions are more complex

and require additional product terms. Although another macrocell can

supply the required logic resources, the MAX 9000 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 LAB local 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 (tLOCAL + tSEXP) is incurred

when shareable expanders are used. Figure 4 shows how shareable

expanders can feed multiple macrocells.

Figure 4. MAX 9000 Shareable Expanders

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

33 Row

FastTrack

Interconnect

Signals

LAB Local Array

Macrocell

Product-Term

Logic

Product-Term Select Matrix

Macrocell

Product-Term

Logic

16 Local 16 Shared

Feedbacks Expanders

10

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