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ISPMACH4ACPLDFAMILY Datasheet(PDF) 6 Page - Lattice Semiconductor

Part No. ISPMACH4ACPLDFAMILY
Description  High Performance E 2 CMOS In-System Programmable Logic
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Maker  LATTICE [Lattice Semiconductor]
Homepage  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

ISPMACH4ACPLDFAMILY Datasheet(HTML) 6 Page - Lattice Semiconductor

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6
ispMACH 4A Family
Table 4. Architectural Summary of ispMACH 4A devices
The Macrocell-I/O cell ratio is defined as the number of macrocells versus the number of I/O
cells internally in a PAL block (Table 4).
The central switch matrix takes all dedicated inputs and signals from the input switch matrices
and routes them as needed to the PAL blocks. Feedback signals that return to the same PAL block
still must go through the central switch matrix. This mechanism ensures that PAL blocks in
ispMACH 4A devices communicate with each other with consistent, predictable delays.
The central switch matrix makes a ispMACH 4A device more advanced than simply several PAL
devices on a single chip. It allows the designer to think of the device not as a collection of
blocks, but as a single programmable device; the software partitions the design into PAL blocks
through the central switch matrix so that the designer does not have to be concerned with the
internal architecture of the device.
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
Notes:
1. M4A3-64/64 internal switch matrix functionality embedded in central switch matrix.
ispMACH 4A Devices
M4A3-64/32, M4A5-64/32
M4A3-96/48, M4A5-96/48
M4A3-128/64, M4A5-128/64
M4A3-192/96, M4A5-192/96
M4A3-256/128, M4A5-256/128
M4A3-384
M4A3-512
M4A3-32/32
M4A5-32/32
M4A3-64/64
M4A3-256/160
M4A3-256/192
Macrocell-I/O Cell
Ratio
2:1
1:1
Input Switch Matrix
Yes
Yes1
Input Registers
Yes
No
Central Switch Matrix
Yes
Yes
Output Switch Matrix
Yes
Yes


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