LFXP15C-3F256I Lattice, LFXP15C-3F256I Datasheet - Page 276
LFXP15C-3F256I
Manufacturer Part Number
LFXP15C-3F256I
Description
IC FPGA 15.5KLUTS 188I/O 256-BGA
Manufacturer
Lattice
Datasheet
1.LFXP3C-3T100C.pdf
(397 pages)
Specifications of LFXP15C-3F256I
Lead Free Status / Rohs Status
Contains lead / RoHS non-compliant
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Part Number:
LFXP15C-3F256I
Manufacturer:
Lattice Semiconductor Corporation
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10 000
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Appendix A. Clock Preferences
A few key clock preferences are introduced below. Refer to the ‘Help’ file for other preferences and detailed infor-
mation.
ASIC
The following preference command assigns a phase of 90° to the CIMDLLA CLKOP.
FREQUENCY
The following physical preference command assigns a frequency of 100 MHz to a net named clk1.
The following preference specifies a hold margin value for each clock domain.
MAXSKEW
The following command assigns a maximum skew of 5 ns to a net named NetB.
MULTICYCLE
The following command will relax the period to 50 ns for the path starting at COMPA to COMPB (NET1).
PERIOD
The following command assigns a clock period of 30 ns to the port named Clk1.
PROHIBIT
This command prohibits the use of a primary clock to route a clock net named bf_clk.
CLOCK_TO_OUT
Specifies a maximum allowable output delay relative to a clock.
Below are two preferences using both the CLKPORT and CLKNET keywords showing the corresponding scope of
TRACE reporting.
The CLKNET will stop tracing the path before the PLL, so you will not get PLL compensation timing numbers.
The above preference will yield the following clock path:
ASIC "my_pll" TYPE "EXHXPLLB" CLKOS_PHASE=90;
FREQUENCY NET "clk1" 100 MHz;
FREQUENCY NET "RX_CLKA_CMOS_c" 100.000 MHz HOLD_MARGIN 1 ns;
MAXSKEW NET "NetB" 5 NS;
MULTICYCLE "PATH1" START COMP "COMPA" END COMP "COMPB" NET "NET1" 50 NS ;
PERIOD PORT "Clk1" 30 NS;
PROHIBIT PRIMARY NET "bf_clk";
CLOCK_TO_OUT PORT "RxAddr_0" 6.000000 ns CLKNET "pll_rxclk" ;
11-20
sysCLOCK PLL Design and Usage Guide
LatticeECP/EC and LatticeXP
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