General Description: The COE file format for the 3.1i Distributed Memory and RAM-based Shift Register cores has changed. If you have an old .coe file from a previous version of these cores, it may not work with D_IP1 updated cores.
Note that the new COE file format is not covered in the 3.1i CORE Generator manual.
Specifying Memory Contents using a COE File:
The initial contents of the memory can be defined using a text file known as a Coefficient (COE) File. COE files must have a ".coe" extension.
The COE file consists of two parameters, similar to an XCO file, but the end of each line is determined with the use of a semi-colon. The two parameters are:
memory_initialization_radix: The radix of the initialization value is specified here, with the choices being 2, 10, or 16.
memory_initialization_vector: Each row of memory elements is defined with a binary, decimal or hexadecimal number whose equivalent binary value represents whether an individual memory element along the width of the row is set to a "1" or a "0". Each row of memory initialization is separated by a space, up to the depth of the memory.
An example COE file is shown below:
(This example .coe file is for RAM that is 4 bits x 11 bits deep. Use a semi-colon (;) to comment out a line.)