mt48lc4m32b2tg-7-it Micron Semiconductor Products, mt48lc4m32b2tg-7-it Datasheet - Page 25

• Manufacturer Part Number: mt48lc4m32b2tg-7-it
• Description: 128mb X32 Sdram
• Manufacturer: Micron Semiconductor Products

Figure 14:
PDF: 09005aef80872800/Source: 09005aef80863355
128MbSDRAMx32_2.fm - Rev. K 9/07 EN
READ-to-PRECHARGE
Notes:
A fixed-length READ burst may be followed by, or truncated with, a PRECHARGE
command to the same bank (provided that auto precharge was not activated), and a full-
page burst may be truncated with a PRECHARGE command to the same bank. The
PRECHARGE 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 14 for each
possible CL; data element n + 3 is either the last of a burst of four or the last desired of a
longer burst. Following the PRECHARGE command, a subsequent command to the
same bank cannot be issued until
hidden during the access of the last data element(s).
COMMAND
COMMAND
1. DQM is LOW.
In the case of a fixed-length burst being executed to completion, a PRECHARGE
command issued at the optimum time (as described above) provides the same operation
that would result from the same fixed-length burst with auto precharge. The disadvan-
COMMAND
ADDRESS
ADDRESS
ADDRESS
CLK
CLK
CLK
DQ
DQ
DQ
BANK a,
BANK a,
BANK a,
COL n
COL n
COL n
T0
T0
T0
READ
READ
READ
CL = 1
CL = 2
T1
T1
T1
NOP
NOP
NOP
D
CL = 3
OUT
n
T2
T2
T2
NOP
NOP
NOP
D
D
n + 1
OUT
OUT
n
25
T3
T3
T3
NOP
NOP
NOP
D
n + 2
D
t
D
n + 1
OUT
RP is met. Note that part of the row precharge time is
OUT
OUT
n
PRECHARGE
PRECHARGE
PRECHARGE
(a or all)
(a or all)
(a or all)
Micron Technology, Inc., reserves the right to change products or specifications without notice.
T4
BANK
T4
BANK
T4
BANK
X = 0 cycles
D
n + 3
X = 1 cycle
D
n + 2
D
n + 1
OUT
OUT
OUT
X = 2 cycles
T5
T5
T5
NOP
NOP
NOP
D
n + 2
D
n + 3
OUT
OUT
t RP
t RP
t RP
T6
T6
T6
NOP
NOP
NOP
D
n + 3
OUT
DON’T CARE
BANK a,
BANK a,
BANK a,
ACTIVE
ACTIVE
ACTIVE
T7
T7
T7
ROW
ROW
ROW
©2001 Micron Technology, Inc. All rights reserved.
128Mb: x32 SDRAM
Register Definition