Initiating operation of a timing device using a read only memory (rom) or a one time programmable non volatile memory (otp nvm)

A method comprising:

• receiving an input at a timing device, the input indicating either read only memory (ROM) is to be loaded or one time programmable non volatile memory (OPT NVM) is to be loaded into a static random access memory (SRAM) of the timing device;
• storing a first timing device configuration in a ROM of the timing device;
• loading the first timing device configuration from the ROM into a SRAM of the timing device when the input indicates ROM is to be loaded;
• when a second timing device configuration is stored in a OTP NVM of the timing device and when the input indicates OTP NVM is to be loaded, loading the second timing device configuration from the OTP NVM into the SRAM, the second timing device configuration different from the first timing device configuration;
• and
• starting timing device operations using the loaded timing device configuration to generate output timing signals.

A timing device comprising:

• a timing device circuit for generating at least one timing signal:
• a mask read only memory (ROM) having a first timing device configuration stored therein;
• a one time programmable non volatile memory (OTP NVM) for storing a second timing device configuration;
• and
• a static random access memory (SRAM) coupled to the timing device circuit, the ROM, the OTP NVM and the configuration select input, the SRAM including a SRAM array and a memory controller that is coupled to the SRAM array, the memory controller operable to receive input indicating whether the SRAM is to be loaded from the ROM or the OTP NVM and operable to load either the first timing device configuration from the ROM or the second timing device configuration from the OTP NVM into the SRAM memory array based on the input.