OTP with a ROM Conversion Option Provides Flexibility and Cost Savings for On-Chip Microcode Storage
Programming time and cost for larger one-time programmable (OTP) non-volatile (NVM) on-chip memories can be significant. Depending on the process technology and the OTP memory size it can take several ...
For large amounts of on-chip code and data, mask read-only memory (ROM) provides an inexpensive and easily programmed storage mechanism. However, the inability to configure ROM after wafer processing ...
The modern day equivalent of 1970s EPROM would be NOR flash, which is itself probably going to be replaced by some variant of MRAM, at least in a lot of applications. Speed is same ballpark to DRAM ...
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