MT48H8M32LFBF-8 View Datasheet(PDF) - Micron Technology
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Truth Tables
Table 8:
Truth Table – Current State Bank n, Command to Bank m
Notes: 1–6; notes appear below and on next page
Current State CS# RAS# CAS# WE# Command (Action)
Notes
Any
H
X
X
X COMMAND INHIBIT (NOP/Continue previous operation)
L
H
H
H NO OPERATION (NOP/Continue previous operation)
Idle
X
X
X
X Any command otherwise allowed to bank m
Row activating, L
L
H
H ACTIVE (Select and activate row)
active, or
precharging
L
H
L
H READ (Select column and start READ burst)
L
H
L
L WRITE (Select column and start WRITE burst)
L
L
H
L PRECHARGE
Read
L
L
H
H ACTIVE (Select and activate row)
(auto precharge L
H
L
H READ (Select column and start new READ burst)
disabled)
L
H
L
L WRITE (Select column and start WRITE burst)
L
L
H
L PRECHARGE
Write
L
L
H
H ACTIVE (Select and activate row)
(auto precharge L
H
L
H READ (Select column and start READ burst)
disabled)
L
H
L
L WRITE (Select column and start new WRITE burst)
L
L
H
L PRECHARGE
Read
(with auto
precharge)
L
L
H
H ACTIVE (Select and activate row)
L
H
L
H READ (Select column and start new READ burst)
L
H
L
L WRITE (Select column and start WRITE burst)
L
L
H
L PRECHARGE
Write
(with auto
precharge)
L
L
H
H ACTIVE (Select and activate row)
L
H
L
H READ (Select column and start READ burst)
L
H
L
L WRITE (Select column and start new WRITE burst)
L
L
H
L PRECHARGE
7
7
7, 8
7, 9
10
7, 11
7, 12
10
7, 13, 14
7, 13, 15
10
7, 13, 16
7, 13, 17
10
Notes:
1. This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Table 6 on page 40) and
after tXSR has been met (if the previous state was self refresh).
2. This table describes alternate bank operation, except where noted; i.e., the current state is
for bank n and the commands shown are those allowed to be issued to bank m (assuming
that bank m is in such a state that the given command is allowable). Exceptions are covered
in the notes below.
3. Current state definitions:
Idle:
Row active:
The bank has been precharged, and tRP has been met.
A row in the bank has been activated, and tRCD has been met. No
data bursts/accesses and no register accesses are in progress.
Read:
A READ burst has been initiated, with auto precharge disabled, and
has not yet terminated or been terminated.
Write:
A WRITE burst has been initiated, with auto precharge disabled, and
has not yet terminated or been terminated.
Read w/auto-
Starts with registration of a READ command with auto precharge
precharge enabled: enabled and ends when tRP has been met. Once tRP is met, the bank
will be in the idle state.
Write w/auto-
Starts with registration of a WRITE command with auto precharge
precharge enabled: enabled and ends when tRP has been met. Once tRP is met, the bank
will be in the idle state.
4. AUTO REFRESH, SELF REFRESH and LMR commands may only be issued when all banks are
idle.
PDF:09005aef8219eeeb/Source: 09005aef8219eedd
MT48H16M16LF_2.fm - Rev F 4/07 EN
43
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©2006 Micron Technology, Inc. All rights reserved.
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