摘要:
Improved methods of programming floating gate memory devices such as MOS EPROMs having a gate, a floating gate, a read channel, and a write or programming channel. Potential is applied to the read channel (which is normally inactive during programming) in order to increase the voltage induced on the floating gate by the programming voltage applied to the gate. This makes it possible to reduce the programming voltage which must be applied to the gate, to reduce the time required to program the device, or to achieve some measure of both of these benefits.
摘要:
A programmable logic device having a relatively small number of programmable product terms (0E,SETN,INV,P0,P1,P2,ACLK,CLEARN) ("P-terms") feeding each fixed combinatorial logic device (51), and additional "expander" programmable P-terms (EXP1,EXP2) which do not directly feed a fixed device. Relatively simple logic functions can be performed by suitably programming the P-terms feeding the fixed devices. More complex logic functions can be performed by suitably programming the required number of expander P-terms, and then combining the outputs of those P-terms by means of another P-term. In order to conserve word lines in the programmable array, multiplexers (150) allow selection of whether expander outputs or external inputs (44) will be applied to certain word lines (102).
摘要:
Improved methods of programming floating gate memory devices such as MOS EPROMs having a gate, a floating gate, a read channel, and a write or programming channel. Potential is applied to the read channel (which is normally inactive during programming) in order to increase the voltage induced on the floating gate by the programming voltage applied to the gate. This makes it possible to reduce the programming voltage which must be applied to the gate, to reduce the time required to program the device, or to achieve some measure of both of these benefits.
摘要:
A flip-flop-type circuit capable of operating either as a conventional D flip-flop or as a device which merely passes through the data applied to it (so-called "flow-through mode"). In the flow-through mode, the circuit has the additional capability of being able to latch in the data flowing through it at any time. Thus the circuit can also operate as a level-sensitive latch.
摘要:
A flip-flop-type circuit capable of operating either as a conventional D flip-flop or as a device which merely passes through the data applied to it (so-called "flow-through mode"). In the flow-through mode, the circuit has the additional capability of being able to latch in the data flowing through it at any time. Thus the circuit can also operate as a level-sensitive latch.
摘要:
A programmable logic device having a relatively small number of programmable product terms (0E,SETN,INV,P0,P1,P2,ACLK,CLEARN) ("P-terms") feeding each fixed combinatorial logic device (51), and additional "expander" programmable P-terms (EXP1,EXP2) which do not directly feed a fixed device. Relatively simple logic functions can be performed by suitably programming the P-terms feeding the fixed devices. More complex logic functions can be performed by suitably programming the required number of expander P-terms, and then combining the outputs of those P-terms by means of another P-term. In order to conserve word lines in the programmable array, multiplexers (150) allow selection of whether expander outputs or external inputs (44) will be applied to certain word lines (102).