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LFSCM3GA15KLUTSEP1F256C Datasheet(PDF) 9 Page - Lattice Semiconductor

No. de pieza LFSCM3GA15KLUTSEP1F256C
Descripción Electrónicos  LatticeSC/M Family Data Sheet
Download  237 Pages
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Fabricante Electrónico  LATTICE [Lattice Semiconductor]
Página de inicio  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

LFSCM3GA15KLUTSEP1F256C Datasheet(HTML) 9 Page - Lattice Semiconductor

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2-5
Architecture
Lattice Semiconductor
LatticeSC/M Family Data Sheet
Modes of Operation
Each Slice is capable of four modes of operation: Logic, Ripple, RAM and ROM. Table 2-2 lists the modes and the
capability of the Slice blocks.
Table 2-2. Slice Modes
Logic Mode
In this mode, the LUTs in each Slice are configured as combinatorial lookup tables. A LUT4 can have 16 possible
input combinations. Any logic function with four inputs can be generated by programming this lookup table. Since
there are two LUT4s per Slice, a LUT5 can be constructed within one Slice. Larger lookup tables such as LUT6,
LUT7 and LUT8 can be constructed by concatenating other Slices in the PFU.
Ripple Mode
Ripple mode allows the efficient implementation of small arithmetic functions. In ripple mode, the following func-
tions can be implemented by each Slice:
• Addition 2-bit
• Subtraction 2-bit
• Up counter 2-bit
• Down counter 2-bit
• Comparator functions of A and B inputs
- A greater-than-or-equal-to B
- A not-equal-to B
- A less-than-or-equal-to B
Ripple Mode includes an optional configuration that performs arithmetic using fast carry chain methods. In this con-
figuration (also referred to as CCU2 mode) two additional signals, Carry Generate and Carry Propagate, are gener-
ated on a per slice basis to allow fast arithmetic functions to be constructed by concatenating Slices.
RAM Mode
In this mode, distributed RAM can be constructed using each LUT block as a 16x1-bit memory. Through the combi-
nation of LUTs and Slices, a variety of different memories can be constructed.
The Lattice design tools support the creation of a variety of different size memories. Where appropriate, the soft-
ware will construct these using distributed memory primitives that represent the capabilities of the Slice. Table 2-3
shows the number of Slices required to implement different distributed RAM primitives. Dual port memories involve
the pairing of two Slices, one Slice functions as the read-write port. The other companion Slice supports the read-
only port. For more information on RAM mode, please see details of additional technical documentation at the end
of this data sheet.
Table 2-3. Number of Slices Required For Implementing Distributed RAM
ROM Mode
The ROM mode uses the same principal as the RAM modes, but without the Write port. Pre-loading is accom-
plished through the programming interface during configuration.
Logic
Ripple
RAM
ROM
PFU Slice
LUT 4x2 or LUT 5x1
2-bit Arithmetic Unit
SPR 16x2
DPR 16x2
ROM 16x2
SPR16x2
DPR16x2
Number of Slices
1
2
Note: SPR = Single Port RAM, DPR = Dual Port RAM


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