M4A3-384SLASH160-10YI datasheet(7/62 Pages) LATTICE

Part #	M4A3-384/160-10YI

Description	High Performance E 2 CMOS In-System Programmable Logic

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ispMACH 4A Family

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Product-Term Array

The product-term array consists of a number of product terms that form the basis of the logic

being implemented. The inputs to the AND gates come from the central switch matrix (Table 5),

and are provided in both true and complement forms for efﬁcient logic implementation.

Logic Allocator

Within the logic allocator, product terms are allocated to macrocells in “product term clusters.”

The availability and distribution of product term clusters are automatically considered by the

software as it ﬁts functions within a PAL block. The size of a product term cluster has been

optimized to provide high utilization of product terms, making complex functions using many

product terms possible. Yet when few product terms are used, there will be a minimal number

of unused—or wasted—product terms left over. The product term clusters available to each

macrocell within a PAL block are shown in Tables 6 and 7.

Each product term cluster is associated with a macrocell. The size of a cluster depends on the

conﬁguration of the associated macrocell. When the macrocell is used in synchronous mode

(Figure 2a), the basic cluster has 4 product terms. When the associated macrocell is used in

asynchronous mode (Figure 2b), the cluster has 2 product terms. Note that if the product term

cluster is routed to a different macrocell, the allocator conﬁguration is not determined by the

mode of the macrocell actually being driven. The conﬁguration is always set by the mode of the

macrocell that the cluster will drive if not routed away, regardless of the actual routing.

In addition, there is an extra product term that can either join the basic cluster to give an

extended cluster, or drive the second input of an exclusive-OR gate in the signal path. If included

with the basic cluster, this provides for up to 20 product terms on a synchronous function that

uses four extended 5-product-term clusters. A similar asynchronous function can have up to 18

product terms.

When the extra product term is used to extend the cluster, the value of the second XOR input

can be programmed as a 0 or a 1, giving polarity control. The possible conﬁgurations of the logic

allocator are shown in Figures 3 and 4.

Table 5. PAL Block Inputs

Device

Number of Inputs to PAL Block

M4A3-32/32 and M4A5-32/32

M4A3-64/32 and M4A5-64/32

M4A3-64/64

M4A3-96/48 and M4A5-96/48

M4A3-128/64 and M4A5-128/64

33

M4A3-192/96 and M4A5-192/96

M4A3-256/128 and M4A5-256/128

34

M4A3-256/160 and M4A3-256/192

M4A3-384

M4A3-512

36

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