Multiport ram memory cell

Details Multiport ram memory cell Multiport ram memory cell

1987-05-01

1989-03-21

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Having particular data buffer or latch

365230, G11C 700

Patent

active

048150380

ABSTRACT:
A multiport random access memory cell includes a current mode latch (68) for storing two logic states and interface circuits for interfacing the input of the latch (68) with multiple input ports and the output of the latch (68) with multiple output ports. The interface circuitry comprises current switches (70-76) for switching current to a current source in the presence of a write select and a row select signal to override the holding current in the current mode latch. The output interface circuitry includes current sensors (78-84) for sensing the logic state in the latch and outputting it to the select output ports in the presence of a row select signal. The current switches and the current sensors utilize current mode logic and with a common current source. The current source is disable in the absence of any row select signal such that power is not drawn by the memory cell in the unselected state.

REFERENCES:
patent: 4616347 (1986-10-01), Bernstein

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