Datasheet

AS4C16M32MD1
Confidential 32 Rev. 1.0/July 2014
Figure 23 — Basic Write Timing Parameters
During Write bursts, the first valid data-in element will be registered on the first rising edge of
DQS following the WRITE command, and the subsequent data elements will be registered on
successive edges of DQS. The Low state of DQS between the WRITE command and the first rising
edge is called the write preamble, and the Low state on DQS following the last data-in element is
called the write postamble.
The time between the WRITE command and the first corresponding rising edge of DQS (tDQSS) is
specified with a relatively wide range - from 75% to 125% of a clock cycle. Figure 24 shows the two
extremes of tDQSS for a burst of 4. Upon completion of a burst, assuming no other commands have
been initiated, the DQs will remain high-Z and any additional input data will be ignored.