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參數(shù)資料
| 型號： | LFXP20E-5FN484C |
| 廠商： | LATTICE SEMICONDUCTOR CORP |
| 元件分類： | FPGA |
| 中文描述： | FPGA, 2464 CLBS, PBGA484 |
| 封裝： | 23 X 23 MM, LEAD FREE, FPBGA-484 |
| 文件頁數(shù)： | 24/130頁 |
| 文件大?。?/td> | 1312K |
| 代理商： | LFXP20E-5FN484C |
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2-9
Architecture
Lattice Semiconductor
LatticeXP Family Data Sheet
Figure 2-8. Per Quadrant Secondary Clock Selection
Figure 2-9. Slice Clock Selection
sysCLOCK Phase Locked Loops (PLLs)
The PLL clock input, from pin or routing, feeds into an input clock divider. There are three sources of feedback sig-
nals to the feedback divider: from CLKOP (PLL internal), from clock net (CLKOP or CLKOS) or from a user clock
(PIN or logic). There is a PLL_LOCK signal to indicate that VCO has locked on to the input clock signal. Figure 2-
10 shows the sysCLOCK PLL diagram.
The setup and hold times of the device can be improved by programming a delay in the feedback or input path of
the PLL which will advance or delay the output clock with reference to the input clock. This delay can be either pro-
grammed during configuration or can be adjusted dynamically. In dynamic mode, the PLL may lose lock after
adjustment and not relock until the tLOCK parameter has been satisfied. Additionally, the phase and duty cycle block
allows the user to adjust the phase and duty cycle of the CLKOS output.
The sysCLOCK PLLs provide the ability to synthesize clock frequencies. Each PLL has four dividers associated
with it: input clock divider, feedback divider, post scalar divider and secondary clock divider. The input clock divider
is used to divide the input clock signal, while the feedback divider is used to multiply the input clock signal. The post
scalar divider allows the VCO to operate at higher frequencies than the clock output, thereby increasing the fre-
quency range. The secondary divider is used to derive lower frequency outputs.
4 Secondary Clocks per Quadrant
20 Secondary Clock Feedlines : 4 Clock Input Pads + 16 Routing Signals
Primary Clock
Secondary Clock
Routing
Clock to Each Slice
GND
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| LFXP217E5CFN484C | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:LatticeXP2 Family Data Sheet |
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