mt48h16m16lfbf-75 Micron Semiconductor Products, mt48h16m16lfbf-75 Datasheet - Page 34

• Manufacturer Part Number: mt48h16m16lfbf-75
• Description: 256mb X16, X32 Mobile Sdram
• Manufacturer: Micron Semiconductor Products

PRECHARGE
Figure 25: PRECHARGE Command
Power-Down
PDF:09005aef8219eeeb/Source: 09005aef8219eedd
256mb_x16_sdram_y36m_1.fm - Rev G 2/08 EN
Fixed-length or continuous page WRITE bursts can be truncated with the BURST
TERMINATE command. When truncating a WRITE burst, the input data applied coinci-
dent with the BURST TERMINATE command will be ignored. The last data written
(provided that DQM is LOW at that time) will be the input data applied one clock
previous to the BURST TERMINATE command. This is shown in Figure 22 on page 32,
where data n is the last desired data element of a longer burst.
The PRECHARGE command (see Figure 25) is used to deactivate the open row in a
particular bank or the open row in all banks. The bank(s) will be available for a subse-
quent row access some specified time (
Input A10 determines whether one or all banks are to be precharged, and in the case
where only one bank is to be precharged, inputs BA0, BA1 select the bank. When all
banks are to be precharged, inputs BA0, BA1 are treated as “Don’t Care.” Once a bank has
been precharged, it is in the idle state and must be activated prior to any READ or WRITE
commands being issued to that bank.
A0–A9, A11, A12
Power-down occurs if CKE is registered LOW coincident with a NOP or COMMAND
INHIBIT when no accesses are in progress. If power-down occurs when all banks are
idle, this mode is referred to as precharge power-down; if power-down occurs when
there is a row active in any bank, this mode is referred to as active power-down. Entering
power-down deactivates the input and output buffers, excluding CKE, for maximum
power savings while in standby. The device may not remain in the power-down state
longer than the refresh period (64ms) since no REFRESH operations are performed in
this mode.
BA0, BA1
RAS#
CAS#
WE#
CLK
CKE
A10
CS#
HIGH
VALID ADDRESS
Bank Selected
All Banks
ADDRESS
BANK
34
DON’T CARE
Micron Technology, Inc., reserves the right to change products or specifications without notice.
t
RP) after the precharge command is issued.
256Mb: x16, x32 Mobile SDRAM
©2006 Micron Technology, Inc. All rights reserved
Operations