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LFEC1E-5F900I

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型号: LFEC1E-5F900I
PDF文件:
  • LFEC1E-5F900I PDF文件
  • LFEC1E-5F900I PDF在线浏览
功能描述: LatticeECP/EC Family Data Sheet
PDF文件大小: 557.69 Kbytes
PDF页数: 共117页
制造商: LATTICE[Lattice Semiconductor]
制造商LOGO: LATTICE[Lattice Semiconductor] LOGO
制造商网址: http://www.latticesemi.com
捡单宝LFEC1E-5F900I
PDF页面索引
120%
2-3
Architecture
Lattice Semiconductor LatticeECP/EC Family Data Sheet
PFU and PFF Blocks
The core of the LatticeECP/EC de vices consists of PFU and PFF b loc ks . The PFUs can be prog rammed 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 remainder of the data sheet will use the ter m
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 bloc ks are from routing. There are 53 inputs and 25 outputs associated with each PFU b loc k.
Figure 2-3. PFU Diagram
Slice
Each slice contains two LUT4 lookup tables feeding two registers (programmed to be in FF or Latch mode), and
some associated logic that allows the LUTs to be combined to perfor m functions such as LUT5, LUT6, LUT7 and
LUT8. There is control logic to perform set/reset functions (programmable as synchronous/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 congured for positive/negative and edge/level clocks.
There are 14 input signals: 13 signals from routing and one from the carry-chain (from adjacent slice or PFU).
There are 7 outputs: 6 to routing and one to carry-chain (to adjacent PFU). Table 2-1 lists the signals associated
with each slice.
Slice 0
LUT4 &
CARRY
LUT4 &
CARRY
FF/
Latch
D
FF/
Latch
D
Slice 1
LUT4 &
CARRY
LUT4 &
CARRY
Slice 2
LUT4 &
CARRY
LUT4 &
CARRY
From
Routing
To
Routing
Slice 3
LUT4 &
CARRY
LUT4 &
CARRY
FF/
Latch
D
FF/
Latch
D
FF/
Latch
D
FF/
Latch
D
FF/
Latch
D
FF/
Latch
D
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