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M5-128/104-10VI/1 View Datasheet(PDF) - Lattice Semiconductor

Part Name
Description
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M5-128/104-10VI/1
Lattice
Lattice Semiconductor Lattice
M5-128/104-10VI/1 Datasheet PDF : 47 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
2
OE Generator
Control Generator
32
Block
Feeder
16
Product-term
Array
32
32
Input Register
Path
2
Interconnect Feeder
Figure 2. PAL Block Structure
20446G-002
Product-Term Array and Logic Allocator
The product-term array uses the same sum-of-products architecture as PAL devices and consists of
32 inputs (plus their complements) and 64 product terms arranged in 16 clusters. A cluster is a sum-
of-products function with either 3 of 4 product terms.
Logic allocators assign the clusters to macrocells. Each macrocell can accept up to eight clusters of
three or four product terms, but a given cluster can only be steered to one macrocell (Table 4). If
only three product terms in a cluster are steered, the fourth can be used as an input to an XOR
gate for separate logic generation and/or polarity control.
The wide logic allocator is comprised of all 16 of the individual logic allocators and acts as an output
switch matrix by reassigning logic to macrocells to retain pinout as designs change. The logic
allocation scheme in the MACH 5 device allows for the implementation of large equations (up to
32 product terms) with only one pass through the logic array.
Macrocell
M0
M1
M2
M3
M4
M5
M6
M7
Table 4. Product Term Steering Options for PT Clusters and Macrocells
Available Clusters
Macrocell
Available Clusters
C0, C1, C2, C3, C4
C0, C1, C2, C3, C4, C5
C0, C1, C2, C3, C4, C5, C6
C0, C1, C2, C3, C4, C5, C6, C7
C0, C1, C2, C3, C4, C5, C6, C7
C1, C2, C3, C4, C5, C6, C7, C8
C2, C3, C4, C5, C6, C7, C8, C9
C3, C4, C5, C6, C7, C8, C9, C10
M8
C5, C6, C7, C8, C9, C10, C11, C12
M9
C6, C7, C8, C9, C10, C11, C12, C13
M10
C7, C8, C9, C10, C11, C12, C13, C14
M11
C8, C9, C10, C11, C12, C13, C14, C15
M12
C8, C9, C10, C11, C12, C13, C14, C15
M13
C9, C10, C11, C12, C13, C14, C15
M14
C10, C11, C12, C13, C14, C15
M15
C11, C12, C13, C14, C15
MACH 5 Family
5
 

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