minor edits

rtl/fpga_specific/README.md

@@ -1,7 +1,12 @@
 ## FPGA Platform-Specific Components
 
-This folder contains FPGA vendor-specific components (mostly memory components).
-These alternative files allow a more efficient usage of the special (FPGA-specific) hard macros.
+This folder contains FPGA vendor-specific CPU/processor components (mostly memory components).
+These alternative files allow a more efficient usage of the special (FPGA-specific) hard macros
+and thus, might result in higher performance and/or less area utilization.
 
-For example, if you want to use the FPGA optimized version of the DMEM, please use the file from the
-according FPGA vendor folder instead of the original file from the rtl/core folder.
+Please note, that these FPGA-specific components are **optional**. The Processor/CPU uses an FPGA-independent
+VHDL description.
+
+For example, if you want to use the Lattice iCE40up FPGA optimized versions of the DMEM and DMEM please use the files
+from [`rtl/fpga_specific/lattice_ice40up`](https://github.com/stnolting/neorv32/tree/master/rtl/fpga_specific/lattice_ice40up)
+folder **instead** of the original files from the [`rtl/core folder`](https://github.com/stnolting/neorv32/tree/master/rtl/core).