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3
64Mb: x32 SDRAM, 2.5V
BatRam_25V.p65 – Rev. 0.7, Pub. 2/01
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2001, Micron Technology, Inc.
64Mb: x32, 2.5V
SDRAM
PRELIMINARY
TABLE OF CONTENTS
Functional Block Diagram - 2 Meg x 32 .....................
Pin Descriptions ..........................................................
4
5
Functional Description ............................................
Initialization ...........................................................
Register Definition ................................................
Mode Register ...................................................
Burst Length................................................
Burst Type ...................................................
CAS Latency ................................................
Operating Mode..........................................
Write Burst Mode........................................
Commands ................................................................
Truth Table 1 (Commands and DQM Operation) ................
Command Inhibit .................................................. 10
No Operation (NOP) .............................................. 10
Load Mode Register ............................................... 10
Active ....................................................................... 10
Read ....................................................................... 10
Write ....................................................................... 10
Precharge ................................................................ 10
Auto Precharge....................................................... 10
Burst Terminate ..................................................... 11
Auto Refresh ........................................................... 11
Self Refresh ............................................................. 11
Operation ..................................................................
12
Bank/Row Activation ............................................. 12
Reads ....................................................................... 13
Writes ....................................................................... 19
Precharge ................................................................ 21
Power-Down ........................................................... 21
Clock Suspend........................................................ 22
6
6
6
6
6
7
8
8
8
9
9
Burst Read/Single Write ....................................... 22
Concurrent Auto Precharge ................................. 23
Truth Table 2 (CKE) ..............................................................
Truth Table 3 (Current State, Same Bank) ...........................
26
Truth Table 4 (Current State, Different Bank) .....................
28
Absolute Maximum Ratings....................................... 30
DC Electrical Characteristics and
Operating Conditions ........................................... 30
I
DD
Specifications and Conditions............................. 30
Capacitance.................................................................. 32
25
AC Electrical Characteristics
(Timing Table) ......... 32
Timing Waveforms
Initialize and Load Mode Register....................... 35
Power-Down Mode ................................................ 36
Clock Suspend Mode ............................................ 37
Auto Refresh Mode ................................................ 38
Self Refresh Mode.................................................. 39
Reads
Read - Without Auto Precharge...................... 40
Read - With Auto Precharge............................ 41
Alternating Bank Read Accesses.................... 42
Read - Full-Page Burst ..................................... 43
Read - DQM Operation .................................... 44
Writes
Write - Without Auto Precharge ..................... 45
Write - With Auto Precharge ........................... 46
Alternating Bank Write Accesses ................... 47
Write - Full-Page Burst..................................... 48
Write - DQM Operation.................................... 49