64Mb: x4, x8, x16
SDRAM
TABLE OF CONTENTS
Functional Block Diagram - 16 Meg x 4 .................
Functional Block Diagram - 8 Meg x 8 .................
Functional Block Diagram - 4 Meg x 16 ...............
Pin Descriptions .....................................................
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) .......
4
5
6
7
8
8
8
8
8
9
10
10
10
11
11
12
12
12
12
12
12
12
12
12
13
13
14
14
15
21
23
23
24
24
Concurrent Auto Precharge ......................... 25
Truth Table 2 (CKE) .................................................
27
Truth Table 3 (Current State, Same Bank) ..................
28
Truth Table 4 (Current State, Different Bank) .............
30
Absolute Maximum Ratings ................................... 32
DC Electrical Characteristics
and Operating Conditions ................................... 32
I
DD
Specifications and Conditions ......................... 32
Capacitance ............................................................ 33
Electrical Characteristics and Recommended
Operating Conditions
(Timing Table) ............. 33
Timing Waveforms
Initialize and Load Mode Register .....................
Power-Down Mode ............................................
Clock Suspend Mode .........................................
Auto Refresh Mode ............................................
Self Refresh Mode ..............................................
Reads
Read - Without Auto Precharge ...................
Read - With Auto Precharge .........................
Single Read - Without Auto Precharge ........
Single Read - With Auto Precharge ..............
Alternating Bank Read Accesses ...................
Read - Full-Page Burst ...................................
Read - DQM Operation ................................
Writes
Write - Without Auto Precharge ..................
Write - With Auto Precharge .......................
Single Write - Without Auto Precharge .......
Single Write - With Auto Precharge .............
Alternating Bank Write Accesses .................
Write - Full-Page Burst .................................
Write - DQM Operation ...............................
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
Command Inhibit ........................................
No Operation (NOP) ....................................
Load Mode Register ......................................
Active ............................................................
Read ..............................................................
Write .............................................................
Precharge ......................................................
Auto Precharge .............................................
Burst Terminate ............................................
Auto Refresh .................................................
Self Refresh ...................................................
Operation ..........................................................
Bank/Row Activation ...................................
Reads ............................................................
Writes ...........................................................
Precharge ......................................................
Power-Down .................................................
Clock Suspend ..............................................
Burst Read/Single Write ...............................
64Mb: x4, x8, x16 SDRAM
64MSDRAM.p65 – Rev. 11/99
3
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©1999, Micron Technology, Inc.
MICRON [ MICRON TECHNOLOGY ]
