LFE2M20E-6FN256C LATTICE SEMICONDUCTOR, LFE2M20E-6FN256C Datasheet - Page 20

• Manufacturer Part Number: LFE2M20E-6FN256C
• Description: IC, LATTICEECP2M FPGA, 420MHZ, FPBGA-256
• Manufacturer: LATTICE SEMICONDUCTOR
• Series: LatticeECP2Mr

Specifications of LFE2M20E-6FN256C

• No. Of Logic Blocks: 19000
• No. Of Macrocells: 10500
• No. Of Speed Grades: 6
• No. Of I/o's: 140
• Clock Management: DLL, PLL
• I/o Supply Voltage: 3.465V
• Total Ram Bits: 1217Kbit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Lattice Semiconductor
Slice Clock Selection
Figure 2-17 shows the clock selections and Figure 2-18 shows the control selections for Slice0 through Slice2. All
the primary clocks and the four secondary clocks are routed to this clock selection mux. Other signals can be used
as a clock input to the slices via routing. Slice controls are generated from the secondary clocks or other signals
connected via routing.
If none of the signals are selected for both clock and control then the default value of the mux output is 1. Slice 3
does not have any registers; therefore it does not have the clock or control muxes.
Figure 2-17. Slice0 through Slice2 Clock Selection
Figure 2-18. Slice0 through Slice2 Control Selection
Edge Clock Routing
LatticeECP2/M devices have a number of high-speed edge clocks that are intended for use with the PIOs in the
implementation of high-speed interfaces. There are eight edge clocks per device: two edge clocks per edge. Differ-
ent PLL and DLL outputs are routed to the two muxes on the left and right sides of the device. In addition, the
CLKO signal (generated from the DLLDELA block) is routed to all the edge clock muxes on the left and right sides
of the device. Figure 2-19 shows the selection muxes for these clocks.
Secondary Clock
Secondary Clock
Primary Clock
Routing
Routing
Vcc
Vcc
12
12
8
4
1
3
1
2-17
25:1
16:1
LatticeECP2/M Family Data Sheet
Clock to Slice
Slice Control
Architecture