参数资料
型号: LFE3-35EA-6FN484C
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
中文描述: FPGA, PBGA484
封装: 23 X 23 MM, LEAD FREE, FPBGA-484
文件页数: 39/130页
文件大小: 2667K
代理商: LFE3-35EA-6FN484C
2-13
Architecture
Lattice Semiconductor
LatticeECP3 Family Data Sheet
Primary Clock Routing
The purpose of the primary clock routing is to distribute primary clock sources to the destination quadrants of the
device. A global primary clock is a primary clock that is distributed to all quadrants. The clock routing structure in
LatticeECP3 devices consists of a network of eight primary clock lines (CLK0 through CLK7) per quadrant. The pri-
mary clocks of each quadrant are generated from muxes located in the center of the device. All the clock sources
are connected to these muxes. Figure 2-12 shows the clock routing for one quadrant. Each quadrant mux is identi-
cal. If desired, any clock can be routed globally.
Figure 2-12. Per Quadrant Primary Clock Selection
Dynamic Clock Control (DCC)
The DCC (Quadrant Clock Enable/Disable) feature allows internal logic control of the quadrant primary clock net-
work. When a clock network is disabled, all the logic fed by that clock does not toggle, reducing the overall power
consumption of the device.
Dynamic Clock Select (DCS)
The DCS is a smart multiplexer function available in the primary clock routing. It switches between two independent
input clock sources without any glitches or runt pulses. This is achieved regardless of when the select signal is tog-
gled. There are two DCS blocks per quadrant; in total, there are eight DCS blocks per device. The inputs to the
DCS block come from the center muxes. The output of the DCS is connected to primary clocks CLK6 and CLK7
Figure 2-13 shows the timing waveforms of the default DCS operating mode. The DCS block can be programmed
to other modes. For more information about the DCS, please see the list of technical documentation at the end of
this data sheet.
Figure 2-13. DCS Waveforms
CLK0
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
63:1
58:1
63:1
DCC
DCS
DCC
8 Primary Clocks (CLK0 to CLK7) per Quadrant
PLLs + DLLs + CLKDIVs + PCLK PIOs + SERDES Quads
CLK0
SEL
DCSOUT
CLK1
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LFE3-35EA-6FTN256C 功能描述:FPGA - 现场可编程门阵列 33.3K LUTs 133 I/O 1.2V -6 Speed RoHS:否 制造商:Altera Corporation 系列:Cyclone V E 栅极数量: 逻辑块数量:943 内嵌式块RAM - EBR:1956 kbit 输入/输出端数量:128 最大工作频率:800 MHz 工作电源电压:1.1 V 最大工作温度:+ 70 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-256
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