Firmware

Firmware is software that is embedded in a piece of hardware for example a optical drivers a network card, a router or a scanner all have software that is programmed into special memory contained in the hardware itself.

  1. Low Level Firmware: - This is found in ROM OTP/PROM and PLA structures. Low level firmware is often read only memory and cannot be changed or updated. It is sometimes referred to as hardware.
  2. High Level Firmware: This is used in flash memory for updates that is often considered as software.
  3. Subsystem: These have this own fixed microcode embedded in flash chips. CPU and LCD units. A subsystem is usually considered part of the hard ware device as well as high level firmware.

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