Thanks for your update.
This module has 1MB external flash memory on the module.
Does this IC combination expand ROM size of WICED application by adding external flash ?
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The external flash does not expand the ROM.
The WICED application framework consists of multiple binaries. These binaries are copied into internal + external flash.
You can refer the Appnote for understanding the framework: <WICED>\43xxx_Wi-Fi\doc\WICED-Application-Framework.pdf