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M4-32/32-14JI View Datasheet(PDF) - Lattice Semiconductor

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M4-32/32-14JI Datasheet PDF : 62 Pages
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Macrocell
The macrocell consists of a storage element, routing resources, a clock multiplexer, and
initialization control. The macrocell has two fundamental modes: synchronous and
asynchronous (Figure 5). The mode chosen only affects clocking and initialization in the
macrocell.
Power-Up
Reset
PAL-Block
Initialization
Product Terms
Common PAL-block resource
Individual macrocell resources
From Logic Allocator
From
PAL-Clock
Generator
Block CLK0
Block CLK1
Block CLK2
Block CLK3
Individual
Initialization
Product Term
Power-Up
Reset
SWAP
AP AR
D/T/L Q
a. Synchronous mode
To Output and Input
Switch Matrices
17466G-009
From Logic
Allocator
From PAL-Block
Clock Generator
Individual Clock
Product Term
Block CLK0
Block CLK1
AP AR
D/T/L Q
b. Asynchronous mode
Figure 5. Macrocell
To Output and Input
Switch Matrices
17466G-010
In either mode, a combinatorial path can be used. For combinatorial logic, the synchronous
mode will generally be used, since it provides more product terms in the allocator.
14
MACH 4 Family
 

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