LFECP40 Lattice Semiconductor, LFECP40 Datasheet - Page 12
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LFECP40
Manufacturer Part Number
LFECP40
Description
(LFEC Series) LatticeECP/EC Family Data Sheet
Manufacturer
Lattice Semiconductor
Datasheet
1.LFECP40.pdf
(117 pages)
- Current page: 12 of 117
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Lattice Semiconductor
Figure 2-8. Per Quadrant Primary Clock Selection
Figure 2-9. Per Quadrant Secondary Clock Selection
Figure 2-10. 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-
nal to the feedback divider: from the CLKOP, from the clock net, or from an external pin. There is a PLL_LOCK sig-
nal to indicate that VCO has locked on to the input clock signal. Figure 2-11 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
1. Smaller devices have fewer PLL related lines.
20 Secondary Clock Feedlines : 4 Clock Input Pads + 16 Routing Signals
4 Primary Clocks (CLK0, CLK1, CLK2, CLK3) per Quadrant
Secondary Clock
Primary Clock
20 Primary Clock Sources: 12 PLLs + 4 PIOs + 4 Routing
Routing
4 Secondary Clocks per Quadrant
GND
4
3
DCS
2-9
LatticeECP/EC Family Data Sheet
Clock to Slice
DCS
1
Architecture
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