MT48LC8M32B2 View Datasheet(PDF) - Micron Technology
Part Name
Description
Manufacturer
MT48LC8M32B2 Datasheet PDF : 55 Pages
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PRELIMINARY
256Mb: x32
SDRAM
TRUTH TABLE 3 – CURRENT STATE BANK n, COMMAND TO BANK n
(Notes: 1-6; notes appear below and on next page)
CURRENT STATE CS# RAS# CAS# WE#
Any
HXXX
L HHH
L L HH
Idle
L L LH
LLLL
L LHL
LHLH
Row Active
LHL L
L LHL
Read
LHLH
(Auto
LHL L
Precharge
L LHL
Disabled)
L HH L
Write
LHLH
(Auto
LHL L
Precharge
L LHL
Disabled)
L HH L
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
NOTES
7
7
11
10
10
8
10
10
8
9
10
10
8
9
NOTE:
1. This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Truth Table 2) 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: The bank has been precharged, and tRP has been met.
Row Active: 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. COMMAND
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 Truth Table 3, and according to Truth Table 4.
Precharging: 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.
Row Activating: 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.
Read w/Auto
Precharge Enabled: 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.
09005aef80cd8e48
256MbSDRAMx32.p65 – Rev. B; Pub. 03/04
29
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2003 Micron Technology, Inc.
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