mt48h16m32lfcm-75-it Micron Semiconductor Products, mt48h16m32lfcm-75-it Datasheet - Page 31

• Manufacturer Part Number: mt48h16m32lfcm-75-it
• Description: 512mb 32 Meg X 16, 16 Meg X 32 Mobile Sdram Features
• Manufacturer: Micron Semiconductor Products

Operations
Truth Tables
Table 16:
PDF: 09005aef82ea3742/Source: 09005aef82ea3752
sdr_mobile_sdram_cmd_op_timing_dia_fr4.08__4.fm - Rev. B 4/08 EN
(auto precharge
(auto precharge
Current State
Row active
disabled)
disabled)
Write
Read
Any
Idle
Truth Table – Current State Bank n, Command to Bank n
Notes 1–6; notes appear below this table
Notes:
CS#
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
1. This table applies when CKE
2. This table is bank-specific, except where noted; i.e., the current state is for a specific bank
3. Current state definitions:
4. The following states must not be interrupted by a command issued to the same bank.
RAS# CAS#
after
and the commands shown can be issued to that bank when in that state. Exceptions are
covered in the notes below.
COMMAND INHIBIT or NOP commands, or supported commands to the other bank should
be issued on any clock edge occurring during these states. Supported commands to the
other bank are determined by its current state and Table 16, and according to Table 17 on
page 33.
Idle:
Row active:
Read:
Write:
Precharging:
Row activating:
H
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
t
XSR has been met (if the previous state was self refresh).
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
WE#
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
L
L
The bank has been precharged, and
A row in the bank has been activated, and
bursts/accesses and no register accesses are in progress.
not yet terminated or been terminated.
A WRITE burst has been initiated, with auto precharge disabled, and has
not yet terminated or been terminated.
A READ burst has been initiated, with auto precharge disabled, and has
Command (Action)
COMMAND INHIBIT (NOP/Continue previous operation)
NO OPERATION (NOP/Continue previous operation)
ACTIVE (Select and activate row)
AUTO REFRESH
LOAD MODE REGISTER
PRECHARGE
READ (Select column and start READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE (Deactivate row in bank or banks)
READ (Select column and start new READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE (Truncate READ burst, start PRECHARGE)
BURST TERMINATE
READ (Select column and start READ burst)
WRITE (Select column and start new WRITE burst)
PRECHARGE (Truncate WRITE burst, start PRECHARGE)
BURST TERMINATE
Starts with registration of a PRECHARGE command and ends when
t
Starts with registration of an ACTIVE command and ends when
is met. After
RP is met. After
n-1
31
was HIGH and CKE
t
RCD is met, the bank will be in the row active state.
Micron Technology, Inc., reserves the right to change products or specifications without notice.
t
RP is met, the bank will be in the idle state.
n
is HIGH (see Table 18 on page 35) and
t
RP has been met.
t
RCD has been met. No data
©2007 Micron Technology, Inc. All rights reserved.
SDR Mobile SDRAM
Operations
Notes
9, 10
9, 10
11
10
10
10
10
10
10
7
7
8
8
8
t
RCD