64Mb: x4, x8, x16 SDRAM
READ Operation
Continuous-page READ bursts can be truncated with a BURST TERMINATE command
and fixed-length READ bursts can be truncated with a BURST TERMINATE command,
provided that auto precharge was not activated. The BURST TERMINATE command
should be issued x cycles before the clock edge at which the last desired data element is
valid, where x = CL - 1. This is shown in Figure 23 (page 52) for each possible CAS la-
tency; data element n + 3 is the last desired data element of a longer burst.
Figure 23: Terminating a READ Burst
T0
T1
T2
T3
T4
T5
T6
CLK
BURST
READ
NOP
NOP
NOP
NOP
NOP
Command
Address
DQ
TERMINATE
X = 1 cycle
Bank,
Col n
DOUT
DOUT
DOUT
DOUT
CL = 2
T0
T1
T2
T3
T4
T5
T6
T7
CLK
Command
Address
DQ
BURST
READ
NOP
NOP
NOP
NOP
X = 2 cycles
NOP
NOP
TERMINATE
Bank,
Col n
DOUT
DOUT
DOUT
DOUT
CL = 3
Transitioning data
Don’t Care
1. DQM is LOW.
Note:
PDF: 09005aef80725c0b
64mb_x4x8x16_sdram.pdf - Rev. U 05/13 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
52
© 1999 Micron Technology, Inc. All rights reserved.
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