LFXP3C-4QN208C Lattice, LFXP3C-4QN208C Datasheet - Page 350
LFXP3C-4QN208C
Manufacturer Part Number
LFXP3C-4QN208C
Description
IC FPGA 3.1KLUTS 136I/O 208-PQFP
Manufacturer
Lattice
Datasheet
1.LFXP3C-3T100C.pdf
(397 pages)
Specifications of LFXP3C-4QN208C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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Part Number:
LFXP3C-4QN208C
Manufacturer:
Lattice Semiconductor Corporation
Quantity:
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Figure 17-3. Interface Timing Preference File Example
Analyzing Timing Reports
This section describes two examples of actual Trace reports (.twr report file from Trace). The purpose is to analyze
both examples and understand each section of the reports given the design paths constrained.
Example 1. Multicycle Between Two Different Clocks
In this first example, CLKA and CLKB were assigned 104 MHz and 66 MHz frequencies respectively.
In addition, a multicycle constraint was specified as per the preference file:
See Figure 17-4 for the block diagram and waveform for this example. The resulting Trace report is shown in
Figure 17-5.
Figure 17-4. Multicycle Clock Domains Block Diagram and Waveform
FREQUENCY
FREQUENCY NET "CLKB" 66 MHZ ;
MULTICYCLE "M2" START CLKNET "CLKA" END CLKNET "CLKB" 2.000000 X ;
CLKA
CLKB
PERIOD PORT "clk" 30 NS ;
INPUT_SETUP "port_controller*" 9 NS HOLD 3 NS CLKNET "clk";
CLOCK_TO_OUT "port_controller*" 18 NS MIN 3 NS CLKNET "clk";
OUTPUT PORT "port_controller*" LOAD 74 PF ;
TEMPERATURE 96.8 C ;
NET "CLKA" 104 MHZ ;
CLKB
CLKA
7.9 ns
7.7ns
15.15 ns
9.60 ns
7.70 ns
7.90 ns
30.30 ns
17-6
Combinational
Logic
Lattice Semiconductor FPGA
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