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M4-32/32-15JC View Datasheet(PDF) - Lattice Semiconductor

Part NameDescriptionManufacturer
M4-32/32-15JC High-performance E2CMOS in-system programmable logic, 5-V VCC, 32 macrocells, 32 I/Os, 12ns Lattice
Lattice Semiconductor Lattice
M4-32/32-15JC Datasheet PDF : 62 Pages
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Each PAL block consists of:
x Product-term array
x Logic allocator
x Macrocells
x Output switch matrix
x I/O cells
x Input switch matrix
x Clock generator
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 9),
and are provided in both true and complement forms for efficient logic implementation.
Table 9. PAL Block Inputs
Device
Number of Inputs to PAL Block
M4-32/32 and M4LV-32/32
33
M4-64/32 and M4LV-64/32
33
M4-96/48 and M4LV-96/48
33
M4-128/64 and M4LV-128/64
33
M4-128N/64 and M4LV-128N/64
33
M4-192/96 and M4LV-192/96
34
M4-256/128 and M4LV-256/128
34
M4A3-32/32 and M4A5-32/32
33
M4A3-64/32 and M4A5-64/32
33
M4A3-96/48 and M4A5-96/48
33
M4A3-128/64 and M4A5-128/64
33
M4A3-192/96 and M4A5-192/96
34
M4A3-256/128 and M4A5-256/128
34
M4A3-64/64
36
M4A3-128/96 and M4A3-128/128
36
M4A3-192/68 and M4A3-192/128
36
M4A3-256/160 and M4A3-256/192
36
M4A3-384
36
M4A3-512
36
Because the number of product terms available for a given logic function is not fixed, the full
sum of products is not realized in the array. The product terms drive the logic allocator, which
allocates the appropriate number of product terms to generate the function.
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
10
MACH 4 Family
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