×

Semiconductor memory device, memory system including the same, and method for adjusting timing between internal clock and command

  • US 8,665,664 B2
  • Filed: 07/09/2010
  • Issued: 03/04/2014
  • Est. Priority Date: 02/25/2010
  • Status: Active Grant
First Claim
Patent Images

1. A semiconductor memory device, comprising:

  • a detection unit configured to detect a sync pulse at all of rising and falling edges of an internal clock within a single pulse width of the sync pulse, wherein the single pulse width of the sync pulse corresponds to one cycle of the internal clock used in a gear down mode; and

    a transfer unit configured to transfer the detection result of the detection unit to a memory controller,wherein the transfer unit comprises;

    an operation section configured to perform a logic operation on the detection result of the detection unit,wherein the operation section is configured to generate the operation result which contains information that current internal clock is available if the activation of the sync pulse is detected at the rising edge of the internal clock, and to generate the operation result to delay a command if the activation of the sync pulse is not detected at the rising edge of the internal clock and detected at the falling edge of the internal clock.

View all claims
  • 4 Assignments
Timeline View
Assignment View
    ×
    ×