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LC4384C-35T176C Datasheet(PDF) 7 Page - Lattice Semiconductor

Part No. LC4384C-35T176C
Description  3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
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Maker  LATTICE [Lattice Semiconductor]
Homepage  http://www.latticesemi.com
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 7 page
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Lattice Semiconductor
ispMACH 4000V/B/C/Z Family Data Sheet
7
Table 5. Product Term Expansion Capability
Every time the super cluster allocator is used, there is an incremental delay of tEXP. When the super cluster alloca-
tor is used, all destinations other than the one being steered to, are given the value of ground (i.e., if the super clus-
ter is steered to M (n+4), then M (n) is ground).
Macrocell
The 16 macrocells in the GLB are driven by the 16 outputs from the logic allocator. Each macrocell contains a pro-
grammable XOR gate, a programmable register/latch, along with routing for the logic and control functions.
Figure 5 shows a graphical representation of the macrocell. The macrocells feed the ORP and GRP. A direct input
from the I/O cell allows designers to use the macrocell to construct high-speed input registers. A programmable
delay in this path allows designers to choose between the fastest possible set-up time and zero hold time.
Figure 5. Macrocell
Enhanced Clock Multiplexer
The clock input to the flip-flop can select any of the four block clocks along with the shared PT clock, and true and
complement forms of the optional individual term clock. An 8:1 multiplexer structure is used to select the clock. The
eight sources for the clock multiplexer are as follows:
β€’ Block CLK0
β€’ Block CLK1
Expansion
Chains
Macrocells Associated with Expansion Chain
(with Wrap Around)
Max PT/
Macrocell
Chain-0
M0 β†’ M4 β†’ M8 β†’ M12 β†’ M0
75
Chain-1
M1 β†’ M5 β†’ M9 β†’ M13 β†’ M1
80
Chain-2
M2 β†’ M6 β†’ M10 β†’ M14 β†’ M2
75
Chain-3
M3 β†’ M7 β†’ M11 β†’ M15 β†’ M3
70
Single PT
Block CLK0
Block CLK1
Block CLK2
Block CLK3
PT Clock (optional)
Shared PT Clock
CE
D/T/L
Q
RP
Shared PT Initialization
PT Initialization/CE (optional)
PT Initialization (optional)
From Logic Allocator
Power-up
Initialization
To ORP
To GRP
From I/O Cell
Delay




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