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型號: EPM9400RI208-15
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代理商: EPM9400RI208-15
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-
Term
Select
Matrix
Preset
Clock
Clear
Product-
Term
Select
Matrix
Macrocell
Product-
Term Logic
From
Previous
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.
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