lfe2-12e-5f484i Lattice Semiconductor Corp., lfe2-12e-5f484i Datasheet - Page 14
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lfe2-12e-5f484i
Manufacturer Part Number
lfe2-12e-5f484i
Description
Latticeecp2/m Family Data Sheet Introduction
Manufacturer
Lattice Semiconductor Corp.
Datasheet
1.LFE2-12E-5F484I.pdf
(385 pages)
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Figure 2-9. Clock Divider Connections
Clock Distribution Network
LatticeECP2/M devices have eight quadrant-based primary clocks and eight flexible region-based secondary
clocks/control signals. Two high performance edge clocks are available on each edge of the device to support high
speed interfaces. These clock inputs are selected from external I/Os, the sysCLOCK PLLs, DLLs or routing. These
clock inputs are fed throughout the chip via a clock distribution system.
Primary Clock Sources
LatticeECP2/M devices derive clocks from five primary sources: PLL (GPLL and SPLL) outputs, DLL outputs,
CLKDIV outputs, dedicated clock inputs and routing. LatticeECP2/M devices have two to eight sysCLOCK PLLs
and two DLLs, located on the left and right sides of the device. There are eight dedicated clock inputs, two on each
side of the device, with the exception of the LatticeECP2M 256-fpBGA package devices which have six dedicated
clock inputs on the device. Figure 2-10 shows the primary clock sources.
CLKOP (GPLL)
CLKOS (GPLL)
CLKOP (DLL)
CLKOS (DLL)
PLL PAD
Routing
CLKO
RELEASE
RST
2-11
CLKDIV
LatticeECP2/M Family Data Sheet
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Architecture
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