Semiconductor memory device, method of controlling read preamble signal thereof, and data transmission system

摘要

A system, includes a controller comprising a plurality of first external terminals configured to supply a command and an address, and communicate a data, and communicate a strobe signal related to the data; and a semiconductor memory device including a plurality of second external terminals corresponding to the plurality of first external terminals, at least one of the plurality of first external terminals and at least one of the plurality of second external terminals each being capable of supplying an information specifying a length of a preamble of the strobe signal before the semiconductor memory device communicates the data between the controller and the semiconductor memory device, the semiconductor memory device further including a preamble register configured to be capable of storing the information.

主权项

1. A system, comprising:
a controller comprising a plurality of first external terminals configured to supply a command and an address, to communicate data, and to communicate a strobe signal related to the data; and a semiconductor memory device comprising:
a plurality of second external terminals corresponding to the plurality of first external terminals;a system clock external terminal that receives a system clock from the controller; anda register for storing information specifying a desired length of a preamble of the strobe signal used for outputting the data from the semiconductor memory device, wherein one of the plurality of first external terminals and one of the plurality of second external terminals exchanges the preamble length information, the preamble length information being selected from a plurality of preamble lengths prior to outputting the data from the semiconductor memory device; anda control circuit configured to set the preamble length of the strobe signal based on the preamble length information stored in the register.