Read Only Memory (ROM) are memories that are configured at ASIC fabrication with their binary data. ROM data is configured through mask level changes that are part of fabricating the entire ASIC. The contents of a ROM cannot be modified post production or when the device is in the field. ROMs have the advantage that can can be small in size and that they consume less power than other memory types. Furthermore, a ROM’s contents is non-volatile in that the memory contents will stay constant even if power is removed from the device.

Triad offers VROM or Via Configurable ROM blocks. A VROM can be configured by via-only mask changes at the same time that analog or digital features are changes in a VCA.