参数资料
型号: EP1C6T144I8ES
厂商: Altera Corporation
英文描述: Cyclone FPGA Family Data Sheet
中文描述: 气旋的FPGA系列数据手册
文件页数: 11/104页
文件大小: 763K
代理商: EP1C6T144I8ES
Altera Corporation
January 2007
2–5
Preliminary
Logic Elements
With the LAB-wide
addnsub
control signal, a single LE can implement a
one-bit adder and subtractor. This saves LE resources and improves
performance for logic functions such as DSP correlators and signed
multipliers that alternate between addition and subtraction depending
on data.
The LAB row clocks [5..0] and LAB local interconnect generate the LAB-
wide control signals. The MultiTrack
TM
interconnect's inherent low skew
allows clock and control signal distribution in addition to data.
Figure 2–4
shows the LAB control signal generation circuit.
Figure 2–4. LAB-Wide Control Signals
Logic Elements
The smallest unit of logic in the Cyclone architecture, the LE, is compact
and provides advanced features with efficient logic utilization. Each LE
contains a four-input LUT, which is a function generator that can
implement any function of four variables. In addition, each LE contains a
programmable register and carry chain with carry select capability. A
single LE also supports dynamic single bit addition or subtraction mode
selectable by an LAB-wide control signal. Each LE drives all types of
interconnects: local, row, column, LUT chain, register chain, and direct
link interconnects. See
Figure 2–5
.
labclkena1
labclk2
labclk1
labclkena2
asyncload
or labpre
syncload
Dedicated
LAB Row
Clocks
Local
Interconnect
Local
Interconnect
Local
Interconnect
Local
Interconnect
Local
Interconnect
Local
Interconnect
labclr1
labclr2
synclr
addnsub
6
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