Apparatus for programming a PROM by propagating data words from an address bus to the PROM data terminals
First Claim
1. An adapter for use in connection with an instruction-controlled processor to form an apparatus for carrying out a programming operation to program a PROM having a plurality of locations and a plurality of terminals defining a set of address terminals and a set of data terminals, at least one of the terminals being a program control terminal, the processor having processor socket means for having a pre-programmed PROM inserted therein for use in normal operation of the processor, an internal address bus connected to the processor socket means, and reading means for use in such normal operation to read out such a pre-programmed PROM, the reading means including means for causing the internal address bus to carry a multibit signal, the encoding of which in normal operation of the processor is such as to define an address each time the processor executes a predetermined instruction, the reading means further including means for supplying timing signals used in selecting such pre-programmed PROM, the adapter comprising:
- an adapter input for connecting the adapter to the processor, the adapter input including adapter plug means for temporary insertion into the processor socket means so that the multibit signal is received by the adapter from the internal address bus;
adapter socket means into which a PROM to be programmed is inserted for the programming operation; and
control circuit means for entering a plurality of data words into such inserted PROM, the control circuit means including addressing means connected to the adapter socket means for applying a sequence of addresses to the set of address terminals of such inserted PROM so that each such data word is entered into a separate location, signal propagating means connected between the adapter plug means and the adapter socket means for propagating to the set of data terminals of such inserted PROM each multibit signal of a sequence of such multibit signals received from the internal address bus, and pulse generating means connected by the adapter input to receive the timing signals so as to respond to the timing signals to apply a control signal to the program control terminal of such inserted PROM to cause entry into such inserted PROM each multibit signal that is propagated from the internal address bus to the set of data terminals.
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Abstract
An adapter converts an instruction-controlled processor such as a microprocessor into a PROM programming apparatus. The adapter is compatible with the type of processor having readout circuitry for applying a multibit signal via an internal address bus to a processor socket into which an addressable memory such as an already programmed PROM is inserted for normal processor operation. During a programming operation, the processor socket does not contain a PROM; instead, the adapter is connected between the processor socket and a PROM being programmed. Control circuitry in the adapter receives the multibit signal so as to control the entering of a plurality of data words into the PROM.
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Citations
8 Claims
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1. An adapter for use in connection with an instruction-controlled processor to form an apparatus for carrying out a programming operation to program a PROM having a plurality of locations and a plurality of terminals defining a set of address terminals and a set of data terminals, at least one of the terminals being a program control terminal, the processor having processor socket means for having a pre-programmed PROM inserted therein for use in normal operation of the processor, an internal address bus connected to the processor socket means, and reading means for use in such normal operation to read out such a pre-programmed PROM, the reading means including means for causing the internal address bus to carry a multibit signal, the encoding of which in normal operation of the processor is such as to define an address each time the processor executes a predetermined instruction, the reading means further including means for supplying timing signals used in selecting such pre-programmed PROM, the adapter comprising:
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an adapter input for connecting the adapter to the processor, the adapter input including adapter plug means for temporary insertion into the processor socket means so that the multibit signal is received by the adapter from the internal address bus; adapter socket means into which a PROM to be programmed is inserted for the programming operation; and control circuit means for entering a plurality of data words into such inserted PROM, the control circuit means including addressing means connected to the adapter socket means for applying a sequence of addresses to the set of address terminals of such inserted PROM so that each such data word is entered into a separate location, signal propagating means connected between the adapter plug means and the adapter socket means for propagating to the set of data terminals of such inserted PROM each multibit signal of a sequence of such multibit signals received from the internal address bus, and pulse generating means connected by the adapter input to receive the timing signals so as to respond to the timing signals to apply a control signal to the program control terminal of such inserted PROM to cause entry into such inserted PROM each multibit signal that is propagated from the internal address bus to the set of data terminals. - View Dependent Claims (2, 3, 4, 5)
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6. An adapter for converting into a PROM programmer an instruction-controlled processor which has processor socket means adapted to have inserted in it a pre-programmed PROM having a plurality of locations, a set of address terminals, a set of data terminals, a set of operating power terminals, and a control terminal, and which further has an internal address bus connected to the processor socket means and PROM reading means for causing the internal address bus to carry a multibit signal, the encoding of which in normal operation of the processor is such as to define an address each time a read instruction is executed to read a data word from such an inserted pre-programmed PROM, the PROM reading means further including means for supplying timing signals used in selecting such pre-programmed PROM, the adapter comprising:
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adapter plug means for effecting a connection between the adapter and such a processor, the adapter plug means being inserted into the processor socket means of such connected processor for a PROM programming operation, whereby the adapter receives the multibit signal from the internal address bus; adapter socket means into which a PROM to be programmed is inserted for the programming operation; and control circuit means operative in the course of execution by the processor of sequentially executed read instructions to enter a plurality of data words into such inserted PROM, the control circuit means including addressing means connected to the adapter socket means for applying a sequence of addresses to the set of address terminals of such inserted PROM so that each such data word is entered into a separate location, signal propagating means connected between the adapter plug means and the adapter socket means for propagating to the set of data terminals of such inserted PROM each multibit signal of a sequence of such multibit signals received from the internal address bus, and pulse generating means connected to receive the timing signals so as to respond thereto to apply a control signal to the control terminal to cause entry into such inserted PROM each multibit signal that is propagated from the internal address bus to the set of data terminals. - View Dependent Claims (7, 8)
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Specification