Patent ID: 7414901

Claim:
A data latch timing adjustment apparatus for receiving an external strobe signal and external data in synchronism with the external strobe signal, latching the external data with the external strobe signal and then again latching the latched external data with a system clock, the apparatus comprising: a clock delay selection section for delaying the system clock with a plurality of delay amounts to produce a plurality of delayed system clocks and selectively outputting one of the delayed system clocks produced; a strobe latch section for receiving the external data and the external strobe signal to produce check data in synchronism with the external strobe signal and to latch the received external data or the produced check data in synchronism with the external strobe signal; a system latch section for latching, with the delayed system clock selected by the clock delay selection section, the external data or the check data latched by the strobe latch section; and a clock delay control section for controlling the clock delay selection section.