LFEC10E-3F256C Lattice Semiconductor Corp., LFEC10E-3F256C Datasheet - Page 105

• Manufacturer Part Number: LFEC10E-3F256C
• Description: Latticeecp/ec Family of Fpga Devices Has Been Optimized to Deliver Mainstream Fpga Features at Low Cost.for Maximum Performance And Value, The Latticeecp (EConomy Plus) Fpga Concept Combines an Efficient Fpgafabric With High-speed Dedicated Functions
• Manufacturer: Lattice Semiconductor Corp.

Lattice Semiconductor
LatticeECP/EC sysIO Usage Guide
Appendix C. sysIO Attributes Using Preference File (ASCII file)
You can also enter the sysIO attributes directly in the preference (.prf) file as sysIO buffer preferences. The PRF file
is an ASCII file containing two sections: a schematic section for preferences created by the Mapper or translator,
and a user section for preferences entered by the user. You can write user preferences directly into this file. The
synthesis attributes appear between the schematic start and schematic end of the file. You can enter the sysIO
buffer preferences after the schematic end line using the preference file syntax. Below are a list of sysIO buffer
preference syntax and examples.
IOBUF
This preference is used to assign the attribute IO_TYPE, PULLMODE, SLEWRATE and DRIVE.
Syntax
IOBUF [ALLPORTS | PORT <port_name> | GROUP <group_name>] (keyword=<value>)+;
where:
<port_name> = These are not the actual top-level port names, but should be the signal name attached to the port.
PIOs in the physical design (.ncd) file are named using this convention. Any multiple listings or wildcarding should
be done using GROUPs
Keyword = IO_TYPE, DRIVE, PULLMODE, SLEWRATE.
Example
IOBUF PORT “port1” IO_TYPE=LVTTL33 DRIVE=8 PULLMODE=UP SLEWRATE=FAST;
DEFINE GROUP “bank1” “in*” “out_[0-31]”;
IOBUF GROUP “bank1” IO_TYPE=SSTL18_II;
LOCATE
When this preference is applied to a specified component it places the component at a specified site and locks the
component to the site. If applied to a specified macro instance it places the macro’s reference component at a
specified site, places all of the macro’s pre-placed components (that is, all components that were placed in the
macro’s library file) in sites relative to the reference component, and locks all of these placed components at their
sites. This can also be applied to a specified PGROUP.
Syntax
LOCATE [COMP <comp_name> | MACRO <macro_name>] SITE <site_name>;
LOCATE PGROUP <pgroup_name> [SITE <site_name>; | REGION <region_name>;]
LOCATE PGROUP <pgroup_name> RANGE <site_1> [<site_2> | <count>] [<direction>] | RANGE <chip_side>
[<direction>];
LOCATE BUS < bus_name> ROW|COL <number>;
<bus_name> := string
<number> := integer
Note: If the comp_name, macro_name, or site_name begins with anything other than an alpha character (for exam-
ple, “11C7”), you must enclose the name in quotes. Wildcard expressions are allowed in <comp_name>.
Example
This command places the port Clk0 on the site A4:
LOCATE COMP “Clk0” SITE “A4”;
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