Use of implant process for programming ROM type processor for en

Details Use of implant process for programming ROM type processor for en Use of implant process for programming ROM type processor for en

1982-06-30

1986-07-29

Shaw, Gareth D.

Boots, shoes, and leggings

178 221, G06F 900

Patent

active

046033815

ABSTRACT:
A digital processing system including a nonvolatile memory for the storage of instructions and data where the memory contains a plurality of field effect transistors which selectively conduct current according to the electrical state of their gates and the doping of their channel regions. Also included is a central processing unit for performing operations on data connected to an information transfer bus which is in turn connected to the nonvolatile memory. The information bus is additionally connected to an external interface circuit that provides interface to external peripherals. The memory is programmed by the doping of the channel regions instead of the fabrication or nonfabrication of the gates. Therefore, data that is stored in the memory is invisible to one examining the memory itself. This allows protection to software stored in the permanently programmed memory.

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