m4-128n64-15jc Lattice Semiconductor Corp., m4-128n64-15jc Datasheet - Page 6
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m4-128n64-15jc
Manufacturer Part Number
m4-128n64-15jc
Description
High Performance Cmos In-system Programmable Logic
Manufacturer
Lattice Semiconductor Corp.
Datasheet
1.M4-128N64-15JC.pdf
(46 pages)
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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 MACH
4 devices communicate with each other with consistent, predictable delays.
The central switch matrix makes a MACH 4 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:
6
Product-term array
Logic allocator
Macrocells
Output switch matrix
I/O cells
Input switch matrix
Clock generator
Macrocell-I/O Cell
Ratio
Input Switch Matrix
Input Registers
Central Switch Matrix
Output Switch Matrix
Table 4. Architectural Summary of MACH 4 devices
M4-128N/64, M4LV-128N/64
M4-256/128, M4LV-256/128
M4-128/64, M4LV-128/64
M4-192/96, M4LV-192/96
M4-64/32, M4LV-64/32
M4-96/48, M4LV-96/48
MACH 4 Family
Yes
Yes
Yes
Yes
2:1
MACH 4 Devices
M4LV-32/32
M4-32/32
Yes
Yes
Yes
1:1
No
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