Expandable multi-port random access memory

Details Expandable multi-port random access memory Expandable multi-port random access memory

G - Physics

11

C

352/40.8

G11C 8/00 (2006.01) G11C 8/16 (2006.01)

Patent

CA 1301322

ABSTRACT OF THE DISCLOSURE A bipolar RAM circuit that can be expanded to provide as many ports as desired has separate read and write ports. Each read port comprises two transistors whose collectors are respectively connected to bit lines for that port and whose emitters are commonly connected to a word line. Each write port comprises a pair of transistors whose collectors are respectively connected to the data latch within the cell, whose bases are tied to a pair of bit lines and whose emitters are connected in common to a word line for that write port. To write information into the cell, current is either steered from a standby current path to a desired word line, or a larger write current is steered to the selected word line, causing the data in the cell to be determined by the differential voltage present on the bit lines for the write port.

570918

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