CMS4A16LAx–75Ex
either enabled or disabled for that access. If auto precharge is
enabled, the row being accessed is precharged at the com-
pletion of the burst. During WRITE bursts, the first valid data-in
element will be registered coincident with the WRITE command.
Subsequent data elements will be registered on each
successive positive clock edge. Upon completion of a fixed-
length burst, assuming no other commands have been initiated,
the DQs will remain High-Z and any additional input data will be
ignored (see Figure 15.). A full-page burst will continue until
terminated. (wrap around at the end of the page) An example is
shown in Figure 16. . Data n + 1 is either the last of a burst of
two or the last desired of a longer burst.
A WRITE command can be initiated on any clock cycle fol-
lowing a previous WRITE command. Full-speed random write
accesses within a page can be performed to the same bank,
as shown in Figure 17. , or each subsequent WRITE may be
performed to a different bank.
Write Command
CLK
CKE
High
/CS
/RAS
/CAS
/WE
Column
Address
A0-A8
A9, A11
Enable Auto Precharge
Disable Auto Precharge
A10
Bank
BA0, 1
Address
Don’t Care
Figure 14. Write Command
31
Rev. 0.5, May. ‘07
FIDELIX [ FIDELIX ]
