CMS4A16LAx–75Ex
T0
T1
T2
T3
CLK
Command
Write
NOP
NOP
NOP
Bank
Col n
Address
DQ
Din
n
Din
n+1
Figure 15. Write Burst - Burst length of 2
T0
T1
T2
CLK
Command
Write
NOP
Write
Bank
Col n
Bank
Col b
Address
DQ
Din
n
Din
n+1
Din
b
Figure 16. Write to Write - Transition from a burst of 2 to a single write
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
t
RP is met.
32
Rev. 0.5, May. ‘07
FIDELIX [ FIDELIX ]
