Please note that K and K\ clocks are not true differential clock signals. There is no differential receiver in the SRAM. The QDR uses the rising edges of K and K\ to latch input signals. Both clocks are single ended signals. Although they are not true differential, it is advised to keep K and K\ 180 degrees out of phase with respect to one another. This effect produces the ability for the QDR to perform a double data rate with one clock cycle.