![]() So it is generally not done for very complex chips because the yield would be too low to be economical. If your RAM array doesn't test out, the chip gets canned even though the flash and logic are good. The optimal process characteristics for high performance DRAM, high performance Flash, and high performance logic are generally different and comprimises must be made to combine them on one chip. This is generally not done for high performance devices for several reasons. But they are not designed to be high performance chips, and they are generally made with 'old' processes. ![]() ![]() Microcontrollers generally contain logic, Flash, and SRAM all on one die.
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