High frequency pseudo dual port memory

摘要

A pseudo dual port (PDP) memory is disclosed having a write driver that selectively precharges only one of a bit line and a complement bit line in a bit line pair responsive to a bit value to be written into an accessed bitcell while discharging a remaining one of the bit line and the complement bit line. In this fashion, the cleanup time between a read operation and a write operation during a read/write clock cycle is advantageously reduced.

主权项

1. A method for accessing a bitcell of a pseudo dual port (PDP) memory, comprising:
asserting a word line voltage during a read portion of a memory clock cycle to couple a bitcell to a bit line and a complement bit line for a bit line pair; de-asserting the word line voltage for a write precharge portion of the memory clock cycle; and during the write precharge portion of the memory clock cycle, selectively precharging to a power supply voltage VDD only one of the bit line and the complement bit line in the bit line pair while discharging a remaining one of the bit line and the complement bit line, the selective precharging and discharging being responsive to a bit value to be written into the bitcell; coupling the selectively precharged and discharged bit line pair to the bitcell to write the bit value into the bitcell during a read/write clock cycle.