Mechanisms and techniques allow a host computer system to control caching operations within a data storage system. By using markup-language-based symbols in the finite state devices, it is possible to generate valid markup-language expressions by concatenating the symbols representing the result of the performed function. Insulative spacers are formed on sidewalls of the gate structure, and the insulative spacers contact the semiconductor substrate. Also, some electronic components may be indirectly connected optically to the board through intermediate optical components.