Vizio VM60P HDTV10A Service Manual page 53

On Chip Microcontroller (OCM)
The FLI8668 on-chip microcontroller (OCM) serves as the system microcontroller. It programs
the FLI8668 and manages other devices in the system such as the keypad and non-volatile
RAM (NVRAM) using general-purpose input/output (GPIO) pins. The OCM can address a
22-bit address space to utilize 4 MB external ROM.
Figure 8-8 OCM External Master
The OCM executes a firmware program running from external ROM, as well as driver-level (or
Application Programming Interface – API) functions residing in internal ROM. This is
illustrated above. A parallel port with separate address and data busses is available for this
purpose. This port connects directly to standard, commercially available ROM or
programmable Flash ROM devices in either 8 or 16-bit configurations. External Flash-ROM
memory requirements range from 512Kbytes to 4Mbytes depending on the application.
Both firmware and OSD content must be compiled into a HEX file and then loaded onto the
external ROM. The OSD content is generated using Genesis Workbench. Genesis
Workbench is a GUI-based tool for defining OSD menus, navigation, and functionality; this is
illustrated in Figure 8-9 Programming the OCM shown below.
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