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Microprocessor integrated circuit working in internal ROM and external RAM mode
| Details |
Inventors: Nicolai, Jean;
Assignee: SGS Thomson Microelectronics, S.A. (Gentilly, FR)
Primary Examiner: Treat; William M.
Assistant Examiner:
Attorney, Agent or Firm: Groover; Robert, Formby; Betty, Anderson; Matthew
Integrated circuits can have both a microprocessor and an internal read-only memory of programs on one and the same chip. To facilitate the perfecting and finalizing of the programs of the read-only memory without undertaking the manufacture, for the perfecting and finalizing operation, of a special version of the circuit that is far too different from the definitive version, an external memory is used for the perfecting and finalizing operation. A contact pad of the chip is used for the transmission, in series mode, of a program coming from an external memory. A mode selection pad makes it possible to define whether the microprocessor must work in internal ROM mode (the normal mode) or in external ROM mode (the mode for the perfecting and finalizing operation). The circuit elements added to enable this dual operation take up little space, so that the definitive version of a circuit can be identical to the provisional perfecting and finalizing version, except that the definitive version contains a definitive program in the read-only memory. The content of the read-only memory can be defined by a single mask and, consequently, only a single different mask will have to be made for the definitive version. |
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DETAILED DESCRIPTION The present invention is aimed at proposing a more efficient, less lengthy and less costly system to develop a microprocessor integrated circuit incorporating the microprocessor and a ROM of programs on the same chip.
To this end, there is proposed practically only one version of an integrated circuit, which is both the version designed for the perfecting and finalizing stage and the definitive industrially produced version, except for the fact that the definitive version may differ from the version intended for the test by the content of the ROM.
This is achieved, notably, by designing the integrated circuit so that it has two modes of operation, one wherein the microprocessor carries out the programs stored in the internal ROM and the other wherein the microprocessor carries out modifiable programs contained in an external memory, with means to enable the transmission of addresses and data between the microprocessor and the external memory in the second mode.
To avoid the need for making two different circuit versions, and so that the practically only one version is not excessively costly, it is provided that the means necessary for the operation with an external memory of programs will take up very little space and may remain on the definitive chip.
In particular, one way of achieving this result is to use a contact pad of the chip for the transmission of addresses and data through this pad between the microprocessor and an electrically programmable external memory and a contact pad of the chip reserved for the reception, by the chip, of a signal for selecting the mode of operation of the circuit.
In this way, during the perfecting and finalizing stage, there is applied a selection signal corresponding to the mode in which the microprocessor carries out the external memory programs transmitted in series through the specific contact pad.
Then, for the circuit definitively manufactured in series and including the program fixed in an internal memory, the mode selection signal applied is the one corresponding to the definitive standard mode, namely the mode for the execution of the programs of the internal ROM
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