EtronTech
EM68916CWQA
Figure 28. Write burst interrupt timing: (CL=3, AL=0, RL=3, WL=2, BL=8)
CK#
CK
NOP
Write A
NOP
Write B
NOP
NOP
NOP
NOP
NOP
NOP
CMD
DQS
DQS#
A0
A1
A2
A3
B0
B1
B2
B3
B4
B5
B6
B7
DQs
NOTE 1: Write burst interrupt function is only allowed on burst of 8. Burst interrupt of 4 is prohibited.
NOTE 2: Write burst of 8 can only be interrupted by another Write command. Write burst interruption by Read command or
Precharge command is prohibited.
NOTE 3: Write burst interrupt must occur exactly two clocks after previous Write command. Any other Write burst interrupt
timings are prohibited.
NOTE 4: Write burst interruption is allowed to any bank inside DRAM.
NOTE 5: Write burst with Auto Precharge enabled is not allowed to interrupt.
NOTE 6: Write burst interruption is allowed by another Write with Auto Precharge command.
NOTE 7: All command timings are referenced to burst length set in the mode register. They are not referenced to actual
burst. For example, minimum Write to Precharge timing is WL + BL/2 + tWR where tWR starts with the rising clock after the
uninterrupted burst end and not from the end of actual burst end.
Etron Confidential
45
Rev. 1.1
Apr. 2009
ETRON [ ETRON TECHNOLOGY, INC. ]
