LFE3-150EA-AMC-EVN Lattice Semiconductor Corp., LFE3-150EA-AMC-EVN Datasheet - Page 17
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LFE3-150EA-AMC-EVN
Manufacturer Part Number
LFE3-150EA-AMC-EVN
Description
Specifications: Type: FPGA ; Contents: Board ; For Use With/Related Products: LFE3-150EA ; Lead Free Status: Contains Lead ; RoHS Status: RoHS Non-Compliant
Manufacturer
Lattice Semiconductor Corp.
Datasheet
1.LFE3-150EA-AMC-EVN.pdf
(141 pages)
- Current page: 17 of 141
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Secondary Clock/Control Sources
LatticeECP3 devices derive eight secondary clock sources (SC0 through SC7) from six dedicated clock input pads
and the rest from routing. Figure 2-14 shows the secondary clock sources. All eight secondary clock sources are
defined as inputs to a per-region mux SC0-SC7. SC0-SC3 are primary for control signals (CE and/or LSR), and
SC4-SC7 are for the clock.
In an actual implementation, there is some overlap to maximize routability. In addition to SC0-SC3, SC7 is also an
input to the control signals (LSR or CE). SC0-SC2 are also inputs to clocks along with SC4-SC7.
Figure 2-14. Secondary Clock Sources
Secondary Clock/Control Routing
Global secondary clock is a secondary clock that is distributed to all regions. The purpose of the secondary clock
routing is to distribute the secondary clock sources to the secondary clock regions. Secondary clocks in the
LatticeECP3 devices are region-based resources. Certain EBR rows and special vertical routing channels bind the
secondary clock regions. This special vertical routing channel aligns with either the left edge of the center DSP
slice in the DSP row or the center of the DSP row. Figure 2-15 shows this special vertical routing channel and the
20 secondary clock regions for the LatticeECP3 family of devices. All devices in the LatticeECP3 family have eight
secondary clock resources per region (SC0 to SC7). The same secondary clock routing can be used for control
signals.
Clock Input
Clock Input
From Routing
From Routing
From Routing
From Routing
Note: Clock inputs can be configured in differential or single-ended mode.
Routing
Routing
From
From
Routing
Routing
From
From
Secondary Clock Sources
Clock
Input
2-14
Clock
Input
Routing
Routing
From
From
LatticeECP3 Family Data Sheet
Routing
Routing
From
From
From Routing
From Routing
From Routing
From Routing
Clock Input
Clock Input
Architecture
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