Z Microsystems ZX3 Manual de usuario descargar pdf (Pagina 11)

Altera Corporation 11

MAX 9000 Programmable Logic Device Family Data Sheet

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.

Figure 5 shows how parallel expanders can feed the neighboring

macrocell.

Figure 5. MAX 9000 Parallel Expanders

Preset

Clock

Clear

Product-

Ter m

Select

Matrix

Preset

Clock

Clear

Product-

Ter m

Select

Matrix

Macrocell

Product-

Term Logic

From

Macrocell

To Next

Macrocell

LAB Local

Array

Macrocell

Product-

Term Logic

33 Row

FastTrack

Interconnect

Signals

16 Local

Feedbacks

16 Shared

Expanders

Unused product terms in a macrocell can be allocated to a neighboring macrocell.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 45 46

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Z Microsystems ZX3 Manual de usuario Pagina 11

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