Datasheet

Figure 24 — Write Burst (min. and max. tDQSS)
7.6.1 Write to Write
Data for any WRITE burst may be concatenated with or truncated with a subsequent WRITE command. In either case, a continuous
flow of input data, can be maintained. The new WRITE command can be issued on any positive edge of the clock following the
previous WRITE command.
The first data-in element from the new burst is applied after either the last element of a completed burst or the last desired data
element of a longer burst which is being truncated. The new WRITE command should be issued X cycles after the first WRITE
command, where X equals the number of desired data-in element pairs.
Figure 25 shows concatenated write burst of 4. An example of non-consecutive write bursts is shown in Figure 26.
Full-speed random write accesses within a page or pages can be performed as shown in Figure 27.
7.6.2 Write to Read
Data for any Write burst may be followed by a subsequent READ command. To follow a Write without truncating the write burst,
tWTR should be met as shown in Figure 28.
Data for any Write burst may be truncated by a subsequent READ command as shown in Figure 29. Note that the only data-in pairs
that are registered prior to the tWTR period are written to the internal array, and any subsequent data-in must be masked with DM.
7.6.3 Write to Precharge:
Data for any WRITE burst may be followed by a subsequent PRECHARGE command to the same bank (provided Auto Precharge
was not activated). To follow a WRITE without truncating the WRITE burst, tWR should be met as shown in Figure 30. Data for any
WRITE burst may be truncated by a subsequent PRECHARGE command as shown in Figure 31. Note that only data-in pairs that
are registered prior to the tWR period are written to the internal array, and any subsequent data-in should be masked with DM, as
shown in Figure 31. Following the PRECHARGE command, a subsequent command to the same bank cannot be issued until tRP is
met
AS4C32M16MD1A-5BCN
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Rev.1.2 July 2016