MT48H8M32LFBF-8LG View Datasheet(PDF) - Micron Technology
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Truth Tables
Table 7:
Truth Table – Current State Bank n, Command to Bank n
Notes: 1–6; notes appear below table
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
L
L
H
H ACTIVE (Select and activate row)
L
L
L
H AUTO REFRESH
7
L
L
L
L LMR
7
L
L
H
L PRECHARGE
11
Row active
L
H
L
H READ (Select column and start READ burst)
10
L
H
L
L WRITE (Select column and start WRITE burst)
10
L
L
H
L PRECHARGE (Deactivate row in bank or banks)
8
Read
L
H
L
H READ (Select column and start new READ burst)
10
(auto precharge
L
H
L
L WRITE (Select column and start WRITE burst)
10
disabled)
L
L
H
L PRECHARGE (Truncate READ burst, start PRECHARGE)
8
L
H
H
L BURST TERMINATE
9
Write
L
H
L
H READ (Select column and start READ burst)
10
(auto precharge
L
H
L
L WRITE (Select column and start new WRITE burst)
10
disabled)
L
L
H
L PRECHARGE (Truncate WRITE burst, start PRECHARGE)
8
L
H
H
L BURST TERMINATE
9
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 is bank-specific, except where noted; i.e., the current state is for a specific bank
and the commands shown are those allowed to be issued to that bank when in that state.
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.
4. The following states must not be interrupted by a command issued to the same bank. COM-
MAND INHIBIT or NOP commands, or allowable commands to the other bank should be
issued on any clock edge occurring during these states. Allowable commands to the other
bank are determined by its current state and Table 7, and according to Table 8 on page 43.
Precharging:
Row activating:
Read w/auto-
precharge enabled:
Write w/auto-
precharge enabled:
Starts with registration of a PRECHARGE command and ends when
tRP is met. Once tRP is met, the bank will be in the idle state.
Starts with registration of an ACTIVE command and ends when tRCD
is met. Once tRCD is met, the bank will be in the row active state.
Starts with registration of a READ command with auto precharge
enabled and ends when tRP has been met. Once tRP is met, the bank
will be in the idle state.
Starts with registration of a WRITE command with auto precharge
enabled and ends whentRP has been met. Once tRP is met, the bank
will be in the idle state.
PDF:09005aef8219eeeb/Source: 09005aef8219eedd
MT48H16M16LF_2.fm - Rev F 4/07 EN
41
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