CMS3216LAH datasheet(32/46 Pages) FIDELIX

32 / 46 page

Rev0.2, Jan. 2007

CMS3216LAx-75xx

Data for a fixed-length WRITE burst a full-page WRITE burst

may be followed by, or truncated with, a PRECHARGE com-

mand to the same bank.The PRECHARGE command should

be issued tWR after the clock edge at which the last desired

input data element is registered. The auto precharge mode

requires a tWR of at least one clock plus time, regardless of

frequency. In addition, when truncating a WRITE burst, the

DQM signal must be used to mask input data for the clock edge

prior to, and the clock edge coincident with, the PRECHARGE

command. An example is shown in Figure 19.

Data n + 1 is either the last of a burst of two or the last desired

of a longer burst. Following the PRECHARGE command, a

subsequent command to the same bank cannot be issued until

tRP is met.

Figure 16. Write to Write - Transition from a burst of 2 to a single write

Figure 15. Write Burst - Burst length of 2

CLK

Command

Address

Write

NOP

Bank

Col n

Din

n+1

CLK

Command

Address

Write

NOP

Write

Bank

Col n

Din

n+1

Bank

Col b

Din

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