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LFE235SE-5F900C Arkusz danych(PDF) 6 Page - Lattice Semiconductor

Numer części LFE235SE-5F900C
Szczegółowy opis  LatticeECP2/M Family Data Sheet
Download  386 Pages
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Producent  LATTICE [Lattice Semiconductor]
Strona internetowa  http://www.latticesemi.com
Logo LATTICE - Lattice Semiconductor

LFE235SE-5F900C Arkusz danych(HTML) 6 Page - Lattice Semiconductor

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Architecture
Lattice Semiconductor
LatticeECP2/M Family Data Sheet
PFU Blocks
The core of the LatticeECP2/M device consists of PFU blocks, which are provided in two forms, the PFU and PFF.
The PFUs can be programmed to perform Logic, Arithmetic, Distributed RAM and Distributed ROM functions. PFF
blocks can be programmed to perform Logic, Arithmetic and ROM functions. Except where necessary, the remain-
der of this data sheet will use the term PFU to refer to both PFU and PFF blocks.
Each PFU block consists of four interconnected slices, numbered 0-3 as shown in Figure 2-3. All the interconnec-
tions to and from PFU blocks are from routing. There are 50 inputs and 23 outputs associated with each PFU block.
Figure 2-3. PFU Diagram
Slice
Slice 0 through Slice 2 contain two LUT4s feeding two registers, whereas Slice 3 contains two LUT4s only. For
PFUs, Slice 0 and Slice 2 can also be configured as distributed memory, a capability not available in the PFF.
Table 2-1 shows the capability of the slices in both PFF and PFU blocks along with the operation modes they
enable. In addition, each PFU contains some logic that allows the LUTs to be combined to perform functions such
as LUT5, LUT6, LUT7 and LUT8. There is control logic to perform set/reset functions (programmable as synchro-
nous/asynchronous), clock select, chip-select and wider RAM/ROM functions. Figure 2-4 shows an overview of the
internal logic of the slice. The registers in the slice can be configured for positive/negative and edge triggered or
level sensitive clocks.
Table 2-1. Resources and Modes Available per Slice
Slices 0, 1 and 2 have 14 input signals: 13 signals from routing and one from the carry-chain (from the adjacent
slice or PFU). There are seven outputs: six to routing and one to carry-chain (to the adjacent PFU). Slice 3 has 13
input signals from routing and four signals to routing. Table 2-2 lists the signals associated with Slice 0 to Slice 2.
Slice
PFU BLock
PFF Block
Resources
Modes
Resources
Modes
Slice 0
2 LUT4s and 2 Registers
Logic, Ripple, RAM, ROM
2 LUT4s and 2 Registers
Logic, Ripple, ROM
Slice 1
2 LUT4s and 2 Registers
Logic, Ripple, ROM
2 LUT4s and 2 Registers
Logic, Ripple, ROM
Slice 2
2 LUT4s and 2 Registers
Logic, Ripple, RAM, ROM
2 LUT4s and 2 Registers
Logic, Ripple, ROM
Slice 3
2 LUT4s
Logic, ROM
2 LUT4s
Logic, ROM
Slice 0
LUT4 &
CARRY
LUT4 &
CARRY
D
D
Slice 1
LUT4 &
CARRY
LUT4 &
CARRY
Slice 2
LUT4 &
CARRY
LUT4 &
CARRY
From
Routing
To
Routing
Slice 3
LUT4
LUT4
D
D
D
D
FF
FF
FF
FF
FF
FF


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